$66+ Cheap flights from Ontario (ONT) to Washington
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/13. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SEA
Mar 22 — Mar 291
1 adult, Economy
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Find cheap flights from Ontario to Washington with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from Ontario to WashingtonExplore the most affordable flight options available from Ontario to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 20, 2026.
Explore the most affordable flight options available from Ontario to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on February 20, 2026.
This Alaska Airlines deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/247:59 pm
ONT
- SEA
Nonstop2h 51m
Alaska Airlines
Mon 4/277:05 am
SEA
- ONT
Nonstop2h 40m
Alaska Airlines
Deal found 2/19![Alaska Airlines logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/122:06 pm
ONT
- SEA
1 stop6h 14m
Frontier
Sun 3/159:35 pm
SEA
- ONT
1 stop10h 31m
Frontier
Deal found 2/18![Frontier logo]()
$130
This Kiwi.com deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/122:06 pm
ONT
- SEA
1 stop6h 14m
Frontier
Mon 3/169:36 pm
SEA
- ONT
1 stop15h 52m
Frontier
Deal found 2/19![Frontier logo]()
$131
This flugladen.de deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/126:14 am
ONT
- SEA
Nonstop2h 55m
Hawaiian Airlines
Sun 3/158:56 pm
SEA
- ONT
Nonstop2h 36m
Hawaiian Airlines
Deal found 2/19![Hawaiian Airlines logo]()
$134
This Trip.com deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/126:14 am
ONT
- SEA
Nonstop2h 55m
Alaska Airlines
Mon 3/165:10 pm
SEA
- ONT
1 stop6h 42m
Alaska Airlines
Deal found 2/18![Alaska Airlines logo]()
$135
This Alaska Airlines deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/106:14 am
ONT
- SEA
Nonstop2h 55m
Alaska Airlines
Sun 3/158:56 pm
SEA
- ONT
Nonstop2h 36m
Alaska Airlines
Deal found 2/18![Alaska Airlines logo]()
$137
This CheapOair deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1112:02 pm
ONT
- SEA
Nonstop2h 50m
Alaska Airlines
Wed 3/118:05 pm
SEA
- ONT
Nonstop2h 39m
Alaska Airlines
Deal found 2/18![Alaska Airlines logo]()
$139
This Delta deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/235:09 pm
ONT
- SEA
1 stop6h 54m
Delta
Wed 3/258:30 am
SEA
- ONT
Nonstop2h 48m
Delta
Deal found 2/18![Delta logo]()
$147
This iWofly deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/134:02 pm
ONT
- SEA
Nonstop2h 50m
Hawaiian Airlines
Sun 3/158:56 pm
SEA
- ONT
Nonstop2h 36m
Hawaiian Airlines
Deal found 2/18![Hawaiian Airlines logo]()
$150
This Alaska Airlines deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/147:00 am
ONT
- PDX
Nonstop2h 28m
Alaska Airlines
Mon 3/162:50 pm
PDX
- ONT
Nonstop2h 24m
Alaska Airlines
Deal found 2/19![Alaska Airlines logo]()
$157
This Trip.com deal was found by Cheapflights users on 2/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/147:00 am
ONT
- PDX
Nonstop2h 28m
Hawaiian Airlines
Sun 3/159:30 pm
PDX
- ONT
Nonstop2h 22m
Hawaiian Airlines
Deal found 2/16![Hawaiian Airlines logo]()
$158
This CheapOair deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1412:59 am
ONT
- PDX
1 stop12h 03m
Frontier
Wed 4/2212:38 pm
PDX
- ONT
1 stop11h 17m
Frontier
Deal found 2/20![Frontier logo]()
$160
Best flights from Ontario to WashingtonDiscover carefully curated flight deals from Ontario to Washington that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 20, 2026.
Discover carefully curated flight deals from Ontario to Washington that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated February 20, 2026.
This Alaska Airlines deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:00 am
ONT
- SEA
Nonstop2h 54m
Alaska Airlines
Sat 4/189:24 pm
SEA
- ONT
Nonstop2h 35m
Alaska Airlines
Deal found 2/17![Alaska Airlines logo]()
$137
This Delta deal was found by Cheapflights users on 2/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/101:20 pm
ONT
- SEA
1 stop5h 08m
Delta
Sat 3/145:30 am
SEA
- ONT
1 stop6h 53m
Delta
Deal found 2/16![Delta logo]()
$137
This Southwest deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/38:40 am
ONT
- SEA
1 stop6h 25m
Southwest
Tue 4/79:20 am
SEA
- ONT
1 stop5h 50m
Southwest
Deal found 2/19![Southwest logo]()
$151
This United Airlines deal was found by Cheapflights users on 2/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/116:00 am
ONT
- PDX
1 stop6h 25m
United Airlines
Fri 4/243:30 pm
PDX
- ONT
1 stop7h 15m
United Airlines
Deal found 2/16![United Airlines logo]()
$187
This Kiwi.com deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:22 pm
ONT
- PSC
1 stop25h 13m
Multiple Airlines
Mon 3/99:25 pm
PSC
- ONT
1 stop16h 03m
Multiple Airlines
Deal found 2/18![Multiple Airlines logo]()
$207
This Alaska Airlines deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/146:00 am
ONT
- SEA
Nonstop2h 54m
Alaska Airlines
Sat 4/189:24 pm
SEA
- ONT
Nonstop2h 35m
Alaska Airlines
Deal found 2/17![Alaska Airlines logo]()
$137
This Delta deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/245:09 pm
ONT
- SEA
1 stop6h 54m
Delta
Fri 3/277:50 pm
SEA
- ONT
Nonstop2h 44m
Delta
Deal found 2/17![Delta logo]()
$147
This Alaska Airlines deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/52:59 pm
ONT
- SEA
1 stop4h 54m
Alaska Airlines
Mon 5/117:05 am
SEA
- ONT
Nonstop2h 40m
Alaska Airlines
Deal found 2/19![Alaska Airlines logo]()
$148
This Delta deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/2111:59 am
ONT
- PDX
1 stop7h 01m
Delta
Tue 3/315:02 pm
PDX
- ONT
1 stop6h 49m
Delta
Deal found 2/18![Delta logo]()
$157
This Southwest deal was found by Cheapflights users on 2/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/46:10 pm
ONT
- PDX
1 stop7h 30m
Southwest
Sat 4/181:35 pm
PDX
- ONT
2 stops7h 10m
Southwest
Deal found 2/16![Southwest logo]()
$182
This Alaska Airlines deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/75:56 pm
ONT
- PDX
Nonstop2h 29m
Alaska Airlines
Tue 5/129:30 pm
PDX
- ONT
Nonstop2h 18m
Alaska Airlines
Deal found 2/18![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/2111:59 am
ONT
- PDX
1 stop4h 57m
Delta
Sat 3/285:30 am
PDX
- ONT
1 stop5h 48m
Delta
Deal found 2/19![Delta logo]()
$157
This Delta deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/242:20 pm
ONT
- SEA
Nonstop3h 04m
Delta
Sun 4/2610:54 am
SEA
- ONT
Nonstop2h 45m
Delta
Deal found 2/18![Delta logo]()
$157
This Alaska Airlines deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/134:02 pm
ONT
- SEA
Nonstop2h 50m
Alaska Airlines
Mon 3/168:56 pm
SEA
- ONT
Nonstop2h 36m
Alaska Airlines
Deal found 2/17![Alaska Airlines logo]()
$157
This Alaska Airlines deal was found by Cheapflights users on 2/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/63:24 pm
ONT
- SEA
Nonstop2h 51m
Alaska Airlines
Wed 5/131:04 pm
SEA
- ONT
1 stop4h 13m
Alaska Airlines
Deal found 2/16![Alaska Airlines logo]()
$157
This Alaska Airlines deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/207:08 pm
ONT
- SEA
Nonstop2h 49m
Alaska Airlines
Tue 3/247:00 am
SEA
- ONT
Nonstop2h 39m
Alaska Airlines
Deal found 2/18![Alaska Airlines logo]()
$158
This United Airlines deal was found by Cheapflights users on 2/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/206:15 am
ONT
- PSC
1 stop5h 21m
United Airlines
Mon 3/233:05 pm
PSC
- ONT
1 stop7h 52m
United Airlines
Deal found 2/16![United Airlines logo]()
$259
This Trip.com deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/192:06 pm
ONT
- BLI
1 stop9h 30m
Multiple Airlines
Mon 3/236:19 pm
BLI
- ONT
1 stop5h 40m
Multiple Airlines
Deal found 2/17![Multiple Airlines logo]()
$264
This Delta deal was found by Cheapflights users on 2/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/45:53 pm
ONT
- PDX
1 stop4h 26m
Delta
Tue 4/77:17 pm
PDX
- ONT
1 stop4h 34m
Delta
Deal found 2/16![Delta logo]()
$182
This Delta deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/85:50 pm
ONT
- GEG
1 stop6h 06m
Delta
Sun 5/106:10 am
GEG
- ONT
1 stop5h 02m
Delta
Deal found 2/17![Delta logo]()
$183
This Alaska Airlines deal was found by Cheapflights users on 2/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/37:00 am
ONT
- PDX
Nonstop2h 28m
Alaska Airlines
Wed 4/85:58 pm
PDX
- ONT
Nonstop2h 25m
Alaska Airlines
Deal found 2/16![Alaska Airlines logo]()
$167
This Delta deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/91:35 pm
ONT
- GEG
1 stop7h 38m
Delta
Tue 5/125:05 am
GEG
- ONT
1 stop6h 07m
Delta
Deal found 2/17![Delta logo]()
$183
This Alaska Airlines deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/247:00 am
ONT
- PDX
Nonstop2h 28m
Alaska Airlines
Mon 3/305:58 pm
PDX
- ONT
Nonstop2h 25m
Alaska Airlines
Deal found 2/18![Alaska Airlines logo]()
$167
This United Airlines deal was found by Cheapflights users on 2/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/31:45 pm
ONT
- PSC
1 stop7h 05m
United Airlines
Sat 3/73:05 pm
PSC
- ONT
1 stop7h 52m
United Airlines
Deal found 2/16![United Airlines logo]()
$307
This Delta deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/15:55 pm
ONT
- GEG
1 stop5h 20m
Delta
Fri 5/85:05 am
GEG
- ONT
1 stop6h 07m
Delta
Deal found 2/18![Delta logo]()
$183
This Alaska Airlines deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/176:14 am
ONT
- SEA
Nonstop2h 55m
Alaska Airlines
Sun 3/227:00 am
SEA
- ONT
Nonstop2h 39m
Alaska Airlines
Deal found 2/17![Alaska Airlines logo]()
$167
This Delta deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/22:20 pm
ONT
- GEG
1 stop6h 42m
Delta
Tue 5/57:15 am
GEG
- ONT
1 stop6h 24m
Delta
Deal found 2/18![Delta logo]()
$183
This Delta deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/85:50 pm
ONT
- GEG
1 stop6h 06m
Delta
Tue 5/125:05 am
GEG
- ONT
1 stop6h 07m
Delta
Deal found 2/17![Delta logo]()
$183
This Alaska Airlines deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/216:00 am
ONT
- GEG
1 stop17h 10m
Alaska Airlines
Sat 4/255:00 am
GEG
- ONT
1 stop4h 45m
Alaska Airlines
Deal found 2/19![Alaska Airlines logo]()
$185
This Delta deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/282:20 pm
ONT
- GEG
1 stop6h 42m
Delta
Tue 5/511:25 am
GEG
- ONT
1 stop5h 50m
Delta
Deal found 2/19![Delta logo]()
$183
Last-minute flights from Ontario to WashingtonDiscover last-minute flight deals from Ontario to Washington. Data last updated February 20, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Washington. Data last updated February 20, 2026 and is based on user searches.
This Alaska Airlines deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/106:14 am
ONT
- SEA
Nonstop2h 55m
Alaska Airlines
Sun 3/158:56 pm
SEA
- ONT
Nonstop2h 36m
Alaska Airlines
Deal found 2/18![Alaska Airlines logo]()
$137
This CheapOair deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/1112:02 pm
ONT
- SEA
Nonstop2h 50m
Alaska Airlines
Wed 3/118:05 pm
SEA
- ONT
Nonstop2h 39m
Alaska Airlines
Deal found 2/18![Alaska Airlines logo]()
$139
This Alaska Airlines deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/126:14 am
ONT
- SEA
Nonstop2h 55m
Alaska Airlines
Mon 3/168:30 am
SEA
- ONT
Nonstop2h 38m
Alaska Airlines
Deal found 2/18![Alaska Airlines logo]()
$128
This Kiwi.com deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/122:06 pm
ONT
- SEA
1 stop6h 14m
Frontier
Sun 3/159:35 pm
SEA
- ONT
1 stop10h 31m
Frontier
Deal found 2/18![Frontier logo]()
$130
This Kiwi.com deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/122:06 pm
ONT
- SEA
1 stop6h 14m
Frontier
Mon 3/169:36 pm
SEA
- ONT
1 stop15h 52m
Frontier
Deal found 2/19![Frontier logo]()
$131
This flugladen.de deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/126:14 am
ONT
- SEA
Nonstop2h 55m
Hawaiian Airlines
Sun 3/158:56 pm
SEA
- ONT
Nonstop2h 36m
Hawaiian Airlines
Deal found 2/19![Hawaiian Airlines logo]()
$134
This iWofly deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/134:02 pm
ONT
- SEA
Nonstop2h 50m
Hawaiian Airlines
Sun 3/158:56 pm
SEA
- ONT
Nonstop2h 36m
Hawaiian Airlines
Deal found 2/18![Hawaiian Airlines logo]()
$150
This Alaska Airlines deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/147:00 am
ONT
- PDX
Nonstop2h 28m
Alaska Airlines
Mon 3/162:50 pm
PDX
- ONT
Nonstop2h 24m
Alaska Airlines
Deal found 2/19![Alaska Airlines logo]()
$157
This Trip.com deal was found by Cheapflights users on 2/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/147:00 am
ONT
- PDX
Nonstop2h 28m
Hawaiian Airlines
Sun 3/159:30 pm
PDX
- ONT
Nonstop2h 22m
Hawaiian Airlines
Deal found 2/16![Hawaiian Airlines logo]()
$158
This Southwest deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/146:10 pm
ONT
- PDX
1 stop7h 30m
Southwest
Tue 3/176:30 am
PDX
- ONT
1 stop3h 55m
Southwest
Deal found 2/17![Southwest logo]()
$172
This Delta deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/235:09 pm
ONT
- SEA
1 stop6h 54m
Delta
Wed 3/258:30 am
SEA
- ONT
Nonstop2h 48m
Delta
Deal found 2/18![Delta logo]()
$147
This Alaska Airlines deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/257:00 am
ONT
- PDX
Nonstop2h 28m
Alaska Airlines
Tue 3/318:00 am
PDX
- ONT
Nonstop2h 19m
Alaska Airlines
Deal found 2/18![Alaska Airlines logo]()
$167
One-way flights from Ontario to WashingtonSearch for one-way flight options from Ontario to Washington. Find affordable one-way fares based on user searches. Data last updated February 20, 2026.
Search for one-way flight options from Ontario to Washington. Find affordable one-way fares based on user searches. Data last updated February 20, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1312:59 am
ONT
- PDX
1 stop12h 03m
Frontier
Deal found 2/16![Frontier logo]()
$66
This United Airlines deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/186:15 am
ONT
- PDX
1 stop6h 18m
United Airlines
Deal found 2/18![United Airlines logo]()
$74
This Alaska Airlines deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/87:08 pm
ONT
- PDX
1 stop4h 36m
Alaska Airlines
Deal found 2/17![Alaska Airlines logo]()
$79
This United Airlines deal was found by Cheapflights users on 2/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/146:15 am
ONT
- PDX
1 stop6h 18m
United Airlines
Deal found 2/16![United Airlines logo]()
$84
This Frontier deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1512:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Deal found 2/19![Frontier logo]()
$86
This CheapOair deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1912:59 am
ONT
- PDX
1 stop12h 03m
Frontier
Deal found 2/19![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/186:15 am
ONT
- GEG
1 stop28h 32m
Frontier
Deal found 2/19![Frontier logo]()
$88
This Trip.com deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/256:15 am
ONT
- GEG
1 stop28h 32m
Frontier
Deal found 2/17![Frontier logo]()
$89
This Alaska Airlines deal was found by Cheapflights users on 2/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/47:00 am
ONT
- PDX
Nonstop2h 28m
Alaska Airlines
Deal found 2/18![Alaska Airlines logo]()
$89
This Kiwi.com deal was found by Cheapflights users on 2/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:22 pm
ONT
- PDX
1 stop13h 51m
Frontier
Deal found 2/20![Frontier logo]()
$90
This Jetabroad deal was found by Cheapflights users on 2/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/2510:03 pm
ONT
- SEA
1 stop22h 17m
Frontier
Deal found 2/17![Frontier logo]()
$90
This CheapOair deal was found by Cheapflights users on 2/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/15:33 pm
ONT
- PDX
1 stop18h 09m
Frontier
Deal found 2/19![Frontier logo]()
$92
Find flight deals from Ontario to Washington
Keep the following information in mind while searching for Ontario to Washington flight deals. Data was last updated February 20, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $128 (Alaska Airlines) |
One-way from | $66 (Kiwi.com) |
Popular in | June |
Cheapest in | March |
Average price | $217 |
Good round-trip deal | $219 or less |
Good one-way deal | $139 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Washington that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 20, 2026.
Use the filters below to find and compare flights from Ontario to Washington that are best for you.
Fly from
Ontario
Fly to
Washington
Route
Depart
Return
Price
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Wed 4/15
6:00 am-8:54 am
Nonstop2h 54m
Seattle/Tacoma Intl
Sat 4/18
9:24 pm-11:59 pm
Nonstop2h 35m
$137
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Tue 3/10
1:20 pm-6:28 pm
1 stop5h 08m
Seattle/Tacoma Intl
Sat 3/14
5:30 am-12:23 pm
1 stop6h 53m
$137
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Tue 4/14
6:00 am-8:54 am
Nonstop2h 54m
Seattle/Tacoma Intl
Sat 4/18
9:24 pm-11:59 pm
Nonstop2h 35m
$137
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Tue 3/24
5:09 pm-12:03 am
1 stop6h 54m
Seattle/Tacoma Intl
Fri 3/27
7:50 pm-10:34 pm
Nonstop2h 44m
$147
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Tue 5/5
2:59 pm-7:53 pm
1 stop4h 54m
Seattle/Tacoma Intl
Mon 5/11
7:05 am-9:45 am
Nonstop2h 40m
$148
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Fri 4/3
8:40 am-3:05 pm
1 stop6h 25m
Seattle/Tacoma Intl
Tue 4/7
9:20 am-3:10 pm
1 stop5h 50m
$151
OntarioPortland
ONT - PDX
ONTPDX
Ontario
Sat 3/21
11:59 am-7:00 pm
1 stop7h 01m
Portland
Tue 3/31
5:02 pm-11:51 pm
1 stop6h 49m
$157
OntarioPortland
ONT - PDX
ONTPDX
Ontario
Thu 5/7
5:56 pm-8:25 pm
Nonstop2h 29m
Portland
Tue 5/12
9:30 pm-11:48 pm
Nonstop2h 18m
$157
OntarioPortland
ONT - PDX
ONTPDX
Ontario
Sat 3/21
11:59 am-4:56 pm
1 stop4h 57m
Portland
Sat 3/28
5:30 am-11:18 am
1 stop5h 48m
$157
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Fri 4/24
2:20 pm-5:24 pm
Nonstop3h 04m
Seattle/Tacoma Intl
Sun 4/26
10:54 am-1:39 pm
Nonstop2h 45m
$157
Showing 1-10 of 60 results
Best time to book a flight from Ontario to Washington
Have a flexible travel schedule? Discover the best time to fly to Washington from Ontario with our price prediction graph.
ONT-PDX
ONT-GEG
ONT-SEA
ONT-PSC
ONT-BLI
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Ontario to Washington
ONT-USWA
ONT-PDX
ONT-GEG
ONT-SEA
ONT-PSC
What is the cheapest month to book a flight from Ontario to State of Washington?
Currently, June is the cheapest month in which you can book a flight from Ontario to State of Washington (average of $39). Flying from Ontario to State of Washington in November is currently the most expensive (average of $94). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from ONT to WA?
Find hourly flight availability from Ontario to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 20, 2026.
One of the essential ways to save on airfare from Ontario to State of Washington is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the morning could potentially save you up to 10% on airfare.
What is the cheapest day to fly from Ontario to State of Washington?
Use this chart to determine the cheapest time to fly round-trip from Ontario to Washington. Price data was last updated on February 17, 2026.
Travelers seeking maximum savings on their Ontario to State of Washington flight should consider departing on Saturday evenings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Ontario to State of Washington
Explore weekly flight availability from Ontario to Washington. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated February 20, 2026.
The most flights from ONT to USWA are scheduled on a Thursday (15 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (10 on average).
Reviews of airlines servicing Washington
Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated February 20, 2026.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and Delta from Ontario to Washington by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
7.8
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Comfort
7.8
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Comfort
7.8
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Comfort
7.8
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Comfort
7.8
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Comfort
7.8
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Related info for your journey
Find useful and relevant information for your journey from Ontario to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Ontario to Washington
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Complete your trip
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Find flights from Ontario to Washington, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Washington flights
Browse other Ontario and Washington flight options. Last updated on February 20, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to Washington flights
Consider these flights traveling from Ontario to Washington.
Top 6 airlines flying from Ontario to Washington
Discover the top 6 airlines that operate flights from Ontario to Washington. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 20, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$81 | Average$180 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$88 | Average$301 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$99 | Average$263 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$140 | Average$394 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$150 | Average$281 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$258 | Average$358 | FlexibilityNo cancel fee | On-time69% |