Cheap flight from Seattle to Ontario from $44
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Flights from Seattle to Ontario
Cheap flight deals from Seattle to Ontario
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
SEA 6:50 PM2h 35mNonstopONT 9:25 PMSeattle - Ontario | Mon, May 12 | Frontier Airlines
SIN 5:35 PM3h 7mNonstopSEA 8:42 PMOntario - Seattle | Wed, May 14 | Frontier Airlines$70 $11137% OFF37% OFF$111 $70 -
SEA 1:50 PM2h 40mNonstopONT 4:30 PMSeattle - Ontario | Wed, Jun 4 | Frontier Airlines
SIN 8:38 AM2h 55mNonstopSEA 11:33 AMOntario - Seattle | Sat, Jun 7 | Frontier Airlines$78 $11130% OFF30% OFF$111 $78
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SEA 3:26 PM2h 36mNonstopONT 6:02 PMSeattle - Ontario | Tue, May 27 | Frontier Airlines
SIN 10:03 AM3hNonstopSEA 1:03 PMOntario - Seattle | Wed, May 28 | Frontier Airlines$86 $11122% OFF22% OFF$111 $86
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SEA 3:10 PM2h 42mNonstopONT 5:52 PMSeattle - Ontario | Tue, Jun 3 | Frontier Airlines
SIN 11:33 AM2h 47mNonstopSEA 2:20 PMOntario - Seattle | Tue, Jun 10 | Frontier Airlines$8721% OFF$111 $87
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SEA 1:50 PM2h 36mNonstopONT 4:26 PMSeattle - Ontario | Sat, May 31 | Frontier Airlines
SIN 10:03 AM2h 46mNonstopSEA 12:49 PMOntario - Seattle | Sat, Jun 7 | Frontier Airlines$8821% OFF$111 $88
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SEA 1:50 PM2h 40mNonstopONT 4:30 PMSeattle - Ontario | Mon, Jun 2 | Frontier Airlines
SIN 8:38 AM2h 55mNonstopSEA 11:33 AMOntario - Seattle | Wed, Jun 4 | Frontier Airlines$8821% OFF$111 $88
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SEA 1:50 PM2h 40mNonstopONT 4:30 PMSeattle - Ontario | Sat, Jun 7 | Frontier Airlines
SIN 10:03 AM2h 46mNonstopSEA 12:49 PMOntario - Seattle | Mon, Jun 9 | Frontier Airlines$8820% OFF$111 $88
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SEA 1:50 PM2h 36mNonstopONT 4:26 PMSeattle - Ontario | Wed, May 28 | Frontier Airlines
SIN 10:03 AM3hNonstopSEA 1:03 PMOntario - Seattle | Sat, May 31 | Frontier Airlines$8920% OFF$111 $89
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SEA 1:50 PM2h 36mNonstopONT 4:26 PMSeattle - Ontario | Sat, May 24 | Frontier Airlines
SIN 8:39 AM3h 7mNonstopSEA 11:46 AMOntario - Seattle | Sat, May 31 | Frontier Airlines$9018% OFF$111 $90
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SEA 3:10 PM2h 42mNonstopONT 5:52 PMSeattle - Ontario | Tue, Jun 10 | Frontier Airlines
SIN 10:06 AM2h 46mNonstopSEA 12:52 PMOntario - Seattle | Wed, Jun 11 | Frontier Airlines$9217% OFF$111 $92
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SEA 1:00 PM17h 25m1 stopsONT Invalid DateSeattle - Ontario | Mon, May 5 | Normal Airline
ONT 3:00 PM6hNonstopSEA 4:00 PMOntario - Seattle | Wed, May 7 | Normal AirlineFind More FlightsFind More Flights
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Cheapest nonstop
SEA 1:50 PM2h 36mNonstopONT 4:26 PMSeattle - Ontario | Sat, May 31 | Frontier Airlines$44 $23381% OFF81% OFF$233 $44
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SEA 3:10 PM2h 42mNonstopONT 5:52 PMSeattle - Ontario | Tue, Jun 3 | Frontier Airlines$44 $23381% OFF81% OFF$233 $44
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SEA 1:50 PM2h 40mNonstopONT 4:30 PMSeattle - Ontario | Wed, Jun 11 | Frontier Airlines$44 $23381% OFF81% OFF$233 $44
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SEA 1:50 PM2h 40mNonstopONT 4:30 PMSeattle - Ontario | Wed, Jun 4 | Frontier Airlines$4581% OFF$233 $45
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SEA 1:50 PM2h 40mNonstopONT 4:30 PMSeattle - Ontario | Tue, Jun 17 | Frontier Airlines$4680% OFF$233 $46
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SEA 3:10 PM2h 42mNonstopONT 5:52 PMSeattle - Ontario | Tue, Jun 10 | Frontier Airlines$4680% OFF$233 $46
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SEA 1:50 PM2h 36mNonstopONT 4:26 PMSeattle - Ontario | Wed, May 28 | Frontier Airlines$4979% OFF$233 $49
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SEA 1:50 PM2h 36mNonstopONT 4:26 PMSeattle - Ontario | Sat, May 24 | Frontier Airlines$4979% OFF$233 $49
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SEA 6:50 PM2h 35mNonstopONT 9:25 PMSeattle - Ontario | Mon, May 5 | Frontier Airlines$10455% OFF$233 $104
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SEA 6:50 PM2h 35mNonstopONT 9:25 PMSeattle - Ontario | Sun, May 4 | Frontier Airlines$19317% OFF$233 $193
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SEA 1:00 PM17h 25m1 stopsONT Invalid DateSeattle - Ontario | 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.
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Frequently Asked Questions
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When are flight tickets from Seattle (SEA) to Ontario (ONT) the cheapest?
Airlines adjust prices for flights from Seattle to Ontario 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 Seattle (SEA) to Ontario (ONT) cost?
According to Trip.com's data, the lowest price is around $183.
How to find a cheap flight from Seattle to Ontario
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 Seattle to Ontario. Book your flights at the right time and save more.
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Check One-way Fares
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Flight Info | Seattle to Ontario
| Cheapest one-way flight price | $43 |
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| Cheapest round-trip ticket price | $70 |
| Off-season for travel | April |
| Peak season for travel | September |
| Flight distance | 12,362.98 km |
| Popular airline | Alaska Airlines |