Cheap flight from Ontario to Seattle from $36
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Flights from Ontario to Seattle
Cheap flight deals from Ontario to Seattle
We've found these cheap flights for you. You can book one-way or round-trip flight tickets.
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Round-trip
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One way
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Cheapest nonstop
ONT 11:35 AM3h 1mNonstopSEA 2:36 PMOntario - Seattle | Tue, May 27 | Frontier Airlines
SEA 3:10 PM2h 42mNonstopSIN 5:52 PMSeattle - Ontario | Tue, Jun 3 | Frontier Airlines$87 $27068% OFF68% OFF$270 $87 -
ONT 10:03 AM2h 46mNonstopSEA 12:49 PMOntario - Seattle | Wed, Jun 4 | Frontier Airlines
SEA 1:50 PM2h 40mNonstopSIN 4:30 PMSeattle - Ontario | Wed, Jun 11 | Frontier Airlines$88 $27067% OFF67% OFF$270 $88
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ONT 11:33 AM2h 47mNonstopSEA 2:20 PMOntario - Seattle | Tue, Jun 10 | Frontier Airlines
SEA 1:50 PM2h 40mNonstopSIN 4:30 PMSeattle - Ontario | Tue, Jun 17 | Frontier Airlines$90 $27067% OFF67% OFF$270 $90
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ONT 11:33 AM2h 47mNonstopSEA 2:20 PMOntario - Seattle | Tue, Jun 3 | Frontier Airlines
SEA 3:10 PM2h 42mNonstopSIN 5:52 PMSeattle - Ontario | Tue, Jun 10 | Frontier Airlines$9166% OFF$270 $91
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ONT 10:03 AM3hNonstopSEA 1:03 PMOntario - Seattle | Wed, May 28 | Frontier Airlines
SEA 10:49 AM2h 45mNonstopSIN 1:34 PMSeattle - Ontario | Sat, May 31 | Frontier Airlines$9465% OFF$270 $94
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ONT 4:29 PM3h 3mNonstopSEA 7:32 PMOntario - Seattle | Mon, May 12 | Frontier Airlines
SEA 6:50 PM2h 35mNonstopSIN 9:25 PMSeattle - Ontario | Mon, May 19 | Frontier Airlines$20624% OFF$270 $206
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ONT 4:29 PM3h 3mNonstopSEA 7:32 PMOntario - Seattle | Sun, May 11 | Frontier Airlines
SEA 4:20 PM2h 45mNonstopSIN 7:05 PMSeattle - Ontario | Sat, May 17 | Frontier Airlines$21222% OFF$270 $212
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ONT 4:29 PM3h 3mNonstopSEA 7:32 PMOntario - Seattle | Mon, May 5 | Frontier Airlines
SEA 6:50 PM2h 35mNonstopSIN 9:25 PMSeattle - Ontario | Mon, May 12 | Frontier Airlines$22118% OFF$270 $221
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ONT 4:29 PM3h 3mNonstopSEA 7:32 PMOntario - Seattle | Thu, May 15 | Frontier Airlines
SEA 6:50 PM2h 35mNonstopSIN 9:25 PMSeattle - Ontario | Sun, May 18 | Frontier Airlines$22417% OFF$270 $224
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ONT 12:16 PM12h 28m1 stopsSEA 12:44 AMOntario - Seattle | Wed, May 7 | Frontier Airlines
SEA 4:20 PM2h 45mNonstopSIN 7:05 PMSeattle - Ontario | Tue, May 13 | Frontier Airlines$8270% OFF$270 $82
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ONT 1:00 PM17h 25m1 stopsSEA Invalid DateOntario - Seattle | Mon, May 5 | Normal Airline
SEA 3:00 PM6hNonstopONT 4:00 PMSeattle - Ontario | Wed, May 7 | Normal AirlineFind More FlightsFind More Flights
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Cheapest nonstop
ONT 10:06 AM2h 46mNonstopSEA 12:52 PMOntario - Seattle | Wed, Jun 11 | Frontier Airlines$36 $15377% OFF77% OFF$153 $36
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ONT 10:03 AM2h 46mNonstopSEA 12:49 PMOntario - Seattle | Wed, Jun 4 | Frontier Airlines$43 $15372% OFF72% OFF$153 $43
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ONT 10:03 AM2h 46mNonstopSEA 12:49 PMOntario - Seattle | Tue, Jun 17 | Frontier Airlines$46 $15370% OFF70% OFF$153 $46
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ONT 10:03 AM3hNonstopSEA 1:03 PMOntario - Seattle | Wed, May 28 | Frontier Airlines$4968% OFF$153 $49
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ONT 10:03 AM2h 46mNonstopSEA 12:49 PMOntario - Seattle | Mon, Jun 2 | Frontier Airlines$5465% OFF$153 $54
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ONT 10:03 AM3hNonstopSEA 1:03 PMOntario - Seattle | Sat, May 24 | Frontier Airlines$9637% OFF$153 $96
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ONT 4:29 PM3h 3mNonstopSEA 7:32 PMOntario - Seattle | Mon, May 5 | Frontier Airlines$10432% OFF$153 $104
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ONT 10:05 AM3hNonstopSEA 1:05 PMOntario - Seattle | Thu, May 22 | Frontier Airlines$10631% OFF$153 $106
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ONT 4:29 PM3h 3mNonstopSEA 7:32 PMOntario - Seattle | Mon, May 12 | Frontier Airlines$11624% OFF$153 $116
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ONT 4:29 PM3h 3mNonstopSEA 7:32 PMOntario - Seattle | Thu, May 8 | Frontier Airlines$12717% OFF$153 $127
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ONT 1:00 PM17h 25m1 stopsSEA Invalid DateOntario - Seattle | Mon, May 5 | Normal AirlineFind More FlightsFind More Flights
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Crossed out prices are calculated based on the average price of the corresponding route on Trip.com.
Flight Info | Ontario to Seattle
| Cheapest one-way flight price | $35 |
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| Cheapest round-trip ticket price | $81 |
| Off-season for travel | March |
| Peak season for travel | February |
| Flight distance | 12,362.98 km |
| Popular airline | Alaska Airlines |
When is the cheapest time to fly from Ontario to Seattle?
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Displayed prices are calculated based on the cheapest average weekly prices of the corresponding route on Trip.com.
Frequently Asked Questions
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When are flight tickets from Ontario (ONT) to Seattle (SEA) the cheapest?
Airlines adjust prices for flights from Ontario to Seattle based on the departure date and time of your selection. By analyzing data from all airlines, we've discovered that on Trip.com, you can find the lowest flight prices on Tuesdays, Wednesdays, and Saturdays. -
How much do flights from Ontario (ONT) to Seattle (SEA) cost?
According to Trip.com's data, the lowest price is around $181.
How to find a cheap flight from Ontario to Seattle
Wait until the last minute and flight costs are often sky-high. Plan ahead, book the right way, and your savings can soar. We have loads of saving tips to help you find a cheap flight from Ontario to Seattle. Book your flights at the right time and save more.
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Check One-way Fares
Buying two cheap one-way flights can sometimes be a better deal than a round-trip.
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