Find the best deals on flights from Seattle to Ontario, CA with Cheapflights.com. Compare prices, dates, airlines and booking tips for this popular route.17 hours, 51 minutes. Average driving speed: 65.5 mph. Kilometers per hour: 105.5 km/h. This is based on typical traffic conditions for this route. Seattle to Ontario drive. road …Flights from Ontario to Seattle. Use Google Flights to plan your next trip and find cheap one way or round trip flights from Ontario to Seattle.The average price for a train ticket from Seattle to Ontario is $128.00, Tickets are generally pricier for this train route, which is to be expected given the long distance. By booking your trip at least 25 days in advance, you increase your chances of scoring even cheaper tickets. But if you wait until the day of your trip to book tickets ...For a quicker trip, book one of these direct flights from California to Seattle. Users seeking other options on flights from California to Seattle should update the search form at the top of the page. Thu 5/16 10:39 am ONT - SEA. Nonstop 2h 53m Frontier. Sun 5/19 2:25 pm SEA - ONT. Nonstop 2h 44m Frontier.Monthly average prices. $225 $180 $135 $90 $45 M J J A S O N D J F M A. Ticket prices for the train from Ontario to Seattle often fluctuate based on the time of year. For the best prices on this route, book in August when the average ticket price is only $153. If you're thinking of traveling from Ontario to Seattle during November, keep in mind ... The two airlines most popular with KAYAK users for flights from Seattle to Toronto are Alaska Airlines and Delta. With an average price for the route of $346 and an overall rating of 8.0, Alaska Airlines is the most popular choice. Delta is also a great choice for the route, with an average price of $591 and an overall rating of 8.0. 01:10PM PDT San Diego Intl - SAN. 04:07PM PDT Seattle-Tacoma Intl - SEA. B739. 2h 57m. Join FlightAware View more flight history Purchase entire flight history for ASA1157. Get Alerts.Cheap flights from Seattle to Ontario (SEA - ONT) from $34. Round-trip One-way Multi-city. From? To? Thu 3/28. Thu 4/4. 1 adult. Economy. Find Your Flight. The best prices from …Use the Uber price estimator to find out how much a ride with Uber is estimated to cost before you request it. Get a cost estimate now.There are 3 airlines that fly nonstop from Seattle to San Francisco. They are: Alaska Airlines, Delta and United Airlines. The cheapest price of all airlines flying this route was found with Delta at $78 for a one-way flight. On average, the …Book your Amtrak train and bus tickets today by choosing from over 30 U.S. train routes and 500 destinations in North America.This is a multi leg flight of Delta Air Lines DL2130. Next leg is Ontario to Seattle. Flight DL2130 is code-shared by 3 airlines using the flight numbers KL6604, VS5470, WS7886. Other flights departing from Seattle SEA: DL528, DL2610, DL4124, AS67. Other flights arriving at Ontario ONT: CI24, DL467, UA5444, AA2968.Deal found 4/17 $387. Pick Dates. Alaska Airlines is one of the most popular airlines used for those traveling from Ontario to Seattle. Flights on this route from Alaska Airlines typically cost $218.72 RT, a price that is 97% cheaper than the average Ontario to Seattle flight. The cheapest flight found was $90 RT.There are 5 non-stop flights from Ontario, California to Seattle, Washington. Alaska Airlines. American Airlines. Delta Air Lines. United Airlines. See the full list of airline routes and airports to book your trip. You may need to drive to a nearby airport to get a direct flight. Use the form below to search for cheap airline tickets.Take a look at some of the best available options we've come across on one-way flights from Seattle to Ontario. Users needing a return flight from Seattle to Ontario should utilize the search form above. Wed 8/5 3:23 p.m. SEA - ONT. Nonstop 2h 39m Delta. Deal found 18/4 C$ 123.Your ending point Ontario, Canada is located at 34.061944,-117.629028. l distance from Seattle to Ontario is 1546 kms equals to miles and 835 nautical miles. Flight time from Seattle to Ontario is 5 hours 18 minutes. Click here to get detail flight schedules from Seattle to Ontario. We offer flight distance calculation from Seattle to Ontario ...Calculate Time and Cost. Quickly get estimated shipping quotes for our global package delivery services. Provide the origin, destination, and weight of your shipment to compare service details then sort your results by time or cost to find the most cost-effective shipping service. Log in and select a UPS account to receive the most accurate ...The flight time from Ontario to Seattle is 2 hours, 39 minutes. The time spent in the air is 2 hours, 13 minutes. These numbers are averages. In reality, it varies by airline with Alaska being the fastest taking 2 hours, 38 minutes, and Delta the slowest taking 2 …Tue, Jun 4 YYZ – SEA with Flair Airlines. 1 stop. from C$478. Toronto.C$497 per passenger.Departing Wed, Jun 12, returning Sat, Jun 15.Round-trip flight with Spirit Airlines and Flair Airlines.Outbound indirect flight with Spirit Airlines, departing from Seattle / Tacoma International on Wed, Jun 12, arriving in Toronto Pearson International ...The easy way to book your flights from Visalia to Ontario. With Expedia, it’s simple to find and book flights to Ontario from Visalia whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from airlines that cover this route. There are nonstop flights to Los Angeles - Ontario Intl., too.The total driving time is 35 hours, 32 minutes. Your trip begins in Seattle, Washington. It ends in Ontario, Canada. If you're planning a road trip, you might be interested in seeing the total driving distance from Seattle, WA to Ontario. You can also calculate the cost to drive from Seattle, WA to Ontario based on current local gas prices and ...01:10PM PDT San Diego Intl - SAN. 04:07PM PDT Seattle-Tacoma Intl - SEA. B739. 2h 57m. Join FlightAware View more flight history Purchase entire flight history for ASA1157. Get Alerts.01:10PM PDT San Diego Intl - SAN. 04:07PM PDT Seattle-Tacoma Intl - SEA. B739. 2h 57m. Join FlightAware View more flight history Purchase entire flight history for ASA1157. Get Alerts.There are 3 non-stop flights from Seattle, Washington to Ontario, California. Alaska Airlines. Delta Air Lines. See the full list of airline routes and airports to book your trip. …The cheapest return flight ticket from Seattle to Ontario found by KAYAK users in the last 72 hours was for $78 on Frontier, followed by Delta ($177). One-way flight deals have …Toronto, Ontario, Canada, CN Tower Cityscape. It’s the first time we’ll connect our home airport to Canada’s largest city Alaska Airlines is announcing new service this spring to a dynamic Canadian destination our guests are going to love: We’ll begin daily nonstops between Seattle and Toronto starting on May 16, 2024, with convenient … All flight schedules from Seattle Tacoma International , Washington , USA to Ontario International Airport , California , USA . This route is operated by 3 airline (s), and the flight time is 2 hours and 48 minutes. The distance is 962 miles. Cheap Flights from Ontario to Seattle (ONT-SEA) Prices were available within the past 7 days and start at $39 for one-way flights and $78 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. Book one-way or return flights from Ontario to Seattle with no change fee on selected flights. Drive • 19h 31m. Drive from Seattle Airport (SEA) to Ontario 1164.4 miles. $210 - $310. Quickest way to get there Cheapest option Distance between. Search Deals. Currently, October is the cheapest month in which you can book a flight from London, Ontario to Seattle (average of C$ 301). Flying from London, Ontario to Seattle in August is currently the most expensive (average of C$ 432). There are several factors that can impact the price of a flight, so comparing airlines, departure ... Cheap Flights from Ontario to Seattle (ONT-SEA) Prices were available within the past 7 days and start at $39 for one-way flights and $78 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. Book one-way or return flights from Ontario to Seattle with no change fee on selected flights. Flights from Seattle, WA to Ontario, CA cover the 964 miles (1555 km) long route taking on average 2 h 42 min with our travel partners like Alaska Airlines or United. … Your trip begins in Seattle, Washington. It ends in Ontario, California. If you're planning a road trip, you might be interested in seeing the total driving distance from Seattle, WA to Ontario, CA. You can also calculate the cost to drive from Seattle, WA to Ontario, CA based on current local gas prices and an estimate of your car's best gas ... Looking for cheap flights to Ontario ? Reserve one-way or return flights from Seattle (SEA) to Ontario (QLA) starting at CA $83. Book now!Book your Amtrak train and bus tickets today by choosing from over 30 U.S. train routes and 500 destinations in North America.There are 5 non-stop flights from Ontario, California to Seattle, Washington. Alaska Airlines. American Airlines. Delta Air Lines. United Airlines. See the full list of airline routes and airports to book your trip. You may need to drive to a nearby airport to get a direct flight. Use the form below to search for cheap airline tickets.Cheap Flights from Seattle Paine Field Intl. Airport to Ontario (PAE-ONT) Prices were available within the past 7 days and start at $304 for one-way flights and $514 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. All deals. One way . Roundtrip. Wed, May 8 - Tue, May 14. PAE. Seattle Paine Field Intl. …Find and book flights from Seattle (SEA) to Ontario (ONT) starting at CA $93 for one-way and CA $106 for round trip. Compare prices, dates, airlines and earn rewards with … Cheap Flights from Ontario to Seattle (ONT-SEA) Prices were available within the past 7 days and start at $39 for one-way flights and $78 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. Book one-way or return flights from Ontario to Seattle with no change fee on selected flights. Reviews for Seattle 321 Reviews. I have lived here since 1975, I moved here from California but was born and raised in Michigan. I would have to say that I never regretted leaving Michigan and their More. I’ve lived in Seattle for just under 7 years and while it can be a stunningly beautiful place, I am very excited to leave.Flight Arrivals information at Ontario Airport (ONT): Status and Estimated times - Today ... Seattle (SEA) 09:28 pm AS1088. QR2105. Alaska Airlines. Qatar Airways . 2. Terminal 2. Landed - On-time [+] Salt Lake City (SLC) 09:37 pm DL1628. AM3463. KL6678. VS3583. Delta Air Lines. Aeromexico . KLM Royal Dutch Airlines . Virgin Atlantic . 2. Terminal 2. … Ontario. $1,391. Flights from Kingston, Ontario to Seattle. $656. Flights from London, Ontario to Seattle. $505. Flights from Ottawa to Seattle. Flights from Toronto Pearson Intl Airport to Seattle. $311. Ontario. $1,391. Flights from Kingston, Ontario to Seattle. $699. Flights from London, Ontario to Seattle. $507. Flights from Ottawa to Seattle. Flights from Toronto Pearson Intl Airport to Seattle. $323. Ontario. $1,391. Flights from Kingston, Ontario to Seattle. $656. Flights from London, Ontario to Seattle. $505. Flights from Ottawa to Seattle. Flights from Toronto Pearson Intl Airport to Seattle. $311. Halfway Point Between Seattle, WA and Ontario, CA. If you want to meet halfway between Seattle, WA and Ontario, CA or just make a stop in the middle of your trip, the exact coordinates of the halfway point of this route are 40.435848 and -122.362793, or 40º 26' 9.0528" N, 122º 21' 46.0548" W. This location is 585.46 miles away from Seattle, WA …SEA - ONT. Find cheap flights from Seattle to Ontario from C$ 67. Return. 1 adult. Economy. 0 bags. Nonstop flights only. Thu 9/5. Thu 16/5. Search hundreds of travel …Use Google Flights to explore cheap flights to anywhere. Search destinations and track prices to find and book your next flight.In winter, however, weather indicators show around -0.46 degrees in Ontario, CA, compared to the -3.71 average degrees reported in Seattle. During the winter period, Seattle can register 12.0 mm precipitation, while Ontario, CA …The cheapest month for flights from Seattle to Toronto Pearson Intl Airport is January, where tickets cost C$ 338 on average. On the other hand, the most expensive months are July and August, where the average cost of tickets is C$ 994 and C$ 905 respectively. Find and book flights from Seattle (SEA) to Ontario (ONT) starting at CA $93 for one-way and CA $106 for round trip. Compare prices, dates, airlines and earn rewards with Expedia.ca. The Gateway to Southern California. Just east of Los Angeles, head to Ontario to experience a little bit of that hustle and bustle of LA with a laid-back vibe. With a vibrant music scene, a huge art scene and a wide variety of foreign restaurants, Ontario is a great place to visit. Fly more and save even more when you travel to Ontario/LA, CA ...Seattle, WA (SEA) Frontier Airlines. El Paso, TX (ELP) Frontier Airlines. June, 2024. Nashville, TN (BNA) Southwest Airlines. July, 2024. Sacramento, CA (SMF) Frontier Airlines. Filter by Airline. View all airlines information Route Request Want to get somewhere you don’t see on our map of destinations? Drop us a note about your route …The best city between Ontario, CA and Seattle, WA to meet is Project City, California. The closest zip code to the midpoint is 96079. The exact latitude and longitude coordinates are 40° 40' 54" N and 122° 20' 51" W. The closest major city that is roughly halfway is Sacramento, CA. The total driving distance from Ontario, CA to Seattle, WA is ...Find the cheapest buses from Seattle to Ontario. Looking for cheap tickets from Seattle to Ontario? FlixBus has you covered. The distance between Seattle and Ontario is 466 miles, which takes a minimum of 11 hours 5 minutes. FlixBus has a large nationwide network, so you can travel onwards with us once you reach Ontario.One-way low-fare flights Ontario to Seattle.* From. flight_takeoff. To. flight_land. Budget $ Cabin Class. Select travel class. keyboard_arrow_down. From. To. Fare Type. Dates. Price. From Ontario (ONT) To Seattle (SEA) One-way | Saver: Depart: Jun 4, 2024: From. $89* Seen: 1 day ago *Prices have been available for one-way trips within the last 48 hours … These results are based on the actual driving distance from Ontario, CA to Seattle, WA, which is 1,170 miles or 1 883 kilometers. Your trip begins in Ontario, California. The price of regular gas is currently averaging $5.30 in California. Your trip ends in Seattle, Washington. The price of regular gas is around $5.07 in Washington. Your trip begins in Ontario, California. It ends in Seattle, Washington. If you're planning a road trip, you might be interested in seeing the total driving distance from Ontario, CA to Seattle, WA. You can also calculate the cost to drive from Ontario, CA to Seattle, WA based on current local gas prices and an estimate of your car's best gas ... Ontario, CA (ONT) Ontario International Airport . Things to know before you go . Terminal Location. Terminal 2. Recommended Arrival Time. 2 hours prior to departure. Ticket Counter Hours. 8:00pm - 11:30pm. TSA Security Checkpoint. 3:45am - 12:50am. Baggage Service Office. Central Baggage Services: 1-866-538-5438. Unaccompanied Minors . Drop-off …Fly Air Canada, voted "Best Airline in North America" by Skytrax and Global Traveler Magazine. Book your Seattle to Toronto flight today. Skip to content-Skip to footer. language Canada-English keyboard_arrow_down. Travel with Air Canada from Seattle to Toronto (SEA - YYZ) from CAD 395* Book with cash. arrow_drop_down. Round-trip. … Prices starting at $78 for return flights and $39 for one-way flights to Los Angeles - Ontario Intl. were the cheapest prices found within the past 7 days, for the period specified. Prices and availability are subject to change. Additional terms apply. Sat, May 18 - Tue, May 21. SEA. Jan 28, 2024 · Deal found 4/17 $387. Pick Dates. Alaska Airlines is one of the most popular airlines used for those traveling from Ontario to Seattle. Flights on this route from Alaska Airlines typically cost $218.72 RT, a price that is 97% cheaper than the average Ontario to Seattle flight. The cheapest flight found was $90 RT. There are 3 airlines that fly nonstop from Seattle to San Francisco. They are: Alaska Airlines, Delta and United Airlines. The cheapest price of all airlines flying this route was found with Delta at $78 for a one-way flight. On average, the … The calculation of flight time is based on the straight line distance from Ontario, CA to Seattle, WA ("as the crow flies"), which is about 966 miles or 1 554 kilometers. Your trip begins in Ontario, California. It ends in Seattle, Washington. Your flight direction from Ontario, CA to Seattle, WA is North (-13 degrees from North). Toronto, Ontario, Canada, CN Tower Cityscape. It’s the first time we’ll connect our home airport to Canada’s largest city Alaska Airlines is announcing new service this spring to a dynamic Canadian destination our guests are going to love: We’ll begin daily nonstops between Seattle and Toronto starting on May 16, 2024, with convenient …Best site for finding today’s lowest flight prices, unadvertised fare sales, and mistake prices. Updated daily. Find the best price before you book your trip to Ontario, CA (ONT).Cheap Alaska Airlines flights from Seattle to California. Some of the best deals we've found on Alaska Airlines flights traveling from Seattle to California. Ensure the flight price, dates, time, and airline match your criteria before you book. Tue 6/11 9:35 pm SEA - SFO. Nonstop 2h 09m Alaska Airlines. Tue 7/2 7:05 am SFO - SEA.Find the best deals for Delta flights from Seattle to Ontario (SEA to ONT) with Travelocity.com. Compare prices, dates, and routes for round trip or one-way tickets. …Fly Air Canada, voted "Best Airline in North America" by Skytrax and Global Traveler Magazine. Book your Seattle to Toronto flight today. Skip to content-Skip to footer United States-English keyboard_arrow_down. Travel with Air Canada from Seattle to Toronto (SEA - YYZ) from USD 278* Book with cash. arrow_drop_down. Round-trip. …Flights from Seattle, WA to Ontario, CA cover the 964 miles (1555 km) long route taking on average 2 h 42 min with our travel partners like Alaska Airlines or United. …The Gateway to Southern California. Just east of Los Angeles, head to Ontario to experience a little bit of that hustle and bustle of LA with a laid-back vibe. With a vibrant music scene, a huge art scene and a wide variety of foreign restaurants, Ontario is a great place to visit. Fly more and save even more when you travel to Ontario/LA, CA ...The flight time from Ontario to Seattle is 2 hours, 39 minutes. The time spent in the air is 2 hours, 13 minutes. These numbers are averages. In reality, it varies by airline with Alaska being the fastest taking 2 hours, 38 minutes, and Delta the slowest taking 2 …Flights from Ontario to Seattle. Use Google Flights to plan your next trip and find cheap one way or round trip flights from Ontario to Seattle.Find the best deals for Delta flights from Seattle to Ontario (SEA to ONT) with Travelocity.com. Compare prices, dates, and routes for round trip or one-way tickets. …These offerings and more make Seattle one of the best vacation destination in Washington. Known for its coffee culture and as the birthplace of Starbucks, Seattle is also one of the top 5 craft beer cities in the U.S., which is ideal for those who prefer to experience the taste of a city served up in a latte mug or a pint glass.Flights from Seattle, WA to Ontario, CA cover the 964 miles (1555 km) long route taking on average 2 h 42 min with our travel partners like Alaska Airlines or United. …AS 1157 Seattle to Ontario Flight Status Alaska Airlines Flight AS1157 from Seattle Tacoma International Airport SEA to Ontario International Airport ONT is not scheduled for today December 18th, 2023. The last time the flight was scheduled was on September 5th, 2023. Check the table below for AS1157's most recent flight history: AS …City: Ontario/LA. State: California. Terminal 4. Gates 403-407. Cities with weekly flights to ONT. 108 *. Cities with daily nonstop flights Monday through Friday to ONT. 10 †. Cities with daily nonstop flights Saturday through Sunday to ONT. 8 airports. The best one-way flight to California from Seattle in the past 72 hours is $39. The best round-trip flight deal from Seattle to California found on momondo in the last 72 hours is $78. The fastest flight from Seattle to California takes 1h 43m. Direct flights go from Seattle to California every day. The trip from Seattle to Ontario / Montclair / Claremont can be as quick as 27 hours 25 minutes and as cost-effective as $177.99. The first bus of the day departs at 6:00 am and the last bus departs at 3:10 pm . Greyhound offers 3 buses daily between Seattle and Ontario / Montclair / Claremont. Best site for finding today’s lowest flight prices, unadvertised fare sales, and mistake prices. Updated daily. Find the best price before you book your trip to Ontario, CA (ONT).
Find and book flights from Seattle (SEA) to Ontario (ONT) starting at CA $93 for one-way and CA $106 for round trip. Compare prices, dates, airlines and earn rewards with …. Sfo to frankfurt
8 airports. The best one-way flight to California from Seattle in the past 72 hours is $39. The best round-trip flight deal from Seattle to California found on momondo in the last 72 hours is $78. The fastest flight from Seattle to California takes 1h 43m. Direct flights go from Seattle to California every day. Tue, Jun 4 YYZ – SEA with Flair Airlines. 1 stop. from C$478. Toronto.C$497 per passenger.Departing Wed, Jun 12, returning Sat, Jun 15.Round-trip flight with Spirit Airlines and Flair Airlines.Outbound indirect flight with Spirit Airlines, departing from Seattle / Tacoma International on Wed, Jun 12, arriving in Toronto Pearson International ... Cheap Flights from Ontario to Seattle (ONT-SEA) Prices were available within the past 7 days and start at $39 for one-way flights and $78 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. Book one-way or return flights from Ontario to Seattle with no change fee on selected flights. Driving distance from Seattle, WA to Ontario, CA is 1173 miles (1887 km). How far is it from Seattle, WA to Ontario, CA? It's a 19 hours 19 minutes drive by car. Flight distance is approximately 967 miles (1556 km) and flight time from Seattle, WA to Ontario, CA is 01 hours 56 minutes.Don't forget to check out our "Gas cost calculator" option.Jan 28, 2024 · Deal found 4/17 $387. Pick Dates. Alaska Airlines is one of the most popular airlines used for those traveling from Ontario to Seattle. Flights on this route from Alaska Airlines typically cost $218.72 RT, a price that is 97% cheaper than the average Ontario to Seattle flight. The cheapest flight found was $90 RT. The cheapest month for flights from Seattle to Toronto Pearson Intl Airport is January, where tickets cost C$ 338 on average. On the other hand, the most expensive months are July and August, where the average cost of tickets is C$ 994 and C$ 905 respectively.Flights from Seattle to Ontario. Use Google Flights to plan your next trip and find cheap one way or round trip flights from Seattle to Ontario.What companies run services between Ontario, CA, USA and Seattle, WA, USA? Alaska Airlines, Inc., Frontier Airlines and three other airlines fly from Ontario to Seattle hourly. Alternatively, you can take a bus from Ontario to Seattle via Pomona Transit Center, Patsaouras Plaza Busway Station W, Los Angeles Union Station, and Sacramento Bus ...This data is provided only for informative purposes. www.ontario-airport.com assumes no responsibility for loss or damage as a result of relying on information posted here. Please contact your airline to verify flight status. Origin Arrival Flight Airline Terminal. Status. Seattle (SEA) 09:33 am AS3452. Alaska Airlines. 2. Terminal 2. Scheduled - On-time [+] …Toll-free: 1-800-361-3223. TTY: 416-325-3408. Toll-free TTY: 1-800-268-7095. Updated: April 22, 2024. Published: July 13, 2020. The Ontario Business Registry allows businesses and not-for-profit corporations to complete over 90 transactions online, including registering, incorporating, and updating their information. Your trip begins in Seattle, Washington. It ends in Ontario, California. If you're planning a road trip, you might be interested in seeing the total driving distance from Seattle, WA to Ontario, CA. You can also calculate the cost to drive from Seattle, WA to Ontario, CA based on current local gas prices and an estimate of your car's best gas ... The total driving distance from Seattle, WA to Ontario, CA is 1,170 miles or 1 883 kilometers. The total straight line flight distance from Seattle, WA to Ontario, CA is 966 miles. This is equivalent to 1 554 kilometers or 839 nautical miles. Your trip begins in Seattle, Washington. It ends in Ontario, California.Cheap flights from Ontario (ONT) to Seattle (SEA) Prices were available within the past 7 days and start at CA $106 for one-way flights and CA $106 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply. Book one-way or return flights from Ontario to Seattle with no change fee on selected ... Connecting flights between Seattle, WA and Ontario, CA. Here is a list of connecting flights from Seattle, Washington to Ontario, California. This can help you find a one-stop flight with the shortest layover time. We found a total of 12 flights to Ontario, CA with one connection: Airline routes; Delta Air Lines SEA to SLC to LGB Cheap flights from Seattle to Ontario (SEA - ONT) from $34. Round-trip One-way Multi-city. From? To? Thu 3/28. Thu 4/4. 1 adult. Economy. Find Your Flight. The best prices from …Select Frontier Airlines flight, departing Tue, Oct 15 from Seattle to Ontario, returning Tue, Oct 22, priced at $88 found 8 hours ago. Sat, May 18 - Mon, May 20. SEA. Seattle. ONT. Ontario. $89 Roundtrip, just found. $89. Roundtrip. just found . Select Frontier Airlines flight, departing Sat, May 18 from Seattle to Ontario, returning Mon, May 20, priced at $89 just ….