$69+ Cheap flights from Ontario (ONT) to Washington
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/22. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SEA
Oct 18 — Oct 251
Round-trip
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 September 18, 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 September 18, 2026.
This Frontier deal was found by Cheapflights users on 9/14. 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 12/92:38 pm -
Nonstop2h 56m
Mon 12/146:49 pm -
Nonstop2h 48m
Deal found 9/14![Frontier logo]()
$152
This Frontier deal was found by Cheapflights users on 9/14. 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.
Thu 10/295:06 pm -
Nonstop3h 02m
Sun 11/110:50 am -
Nonstop2h 48m
Deal found 9/14![Frontier logo]()
$154
This Expedia deal was found by Cheapflights users on 9/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/165:15 pm -
Nonstop2h 56m
Mon 10/199:16 pm -
1 stop19h 14m
Deal found 9/13![Frontier logo]()
$156
This Frontier deal was found by Cheapflights users on 9/14. 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.
Thu 10/155:15 pm -
Nonstop2h 56m
Mon 10/1910:53 am -
Nonstop2h 50m
Deal found 9/14![Frontier logo]()
$157
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Fri 10/95:15 pm -
Nonstop2h 56m
Sun 10/1110:03 am -
Nonstop2h 50m
Deal found 9/14![Frontier logo]()
$158
This Frontier deal was found by Cheapflights users on 9/13. 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.
Fri 10/95:15 pm -
Nonstop2h 56m
Thu 10/1510:03 am -
Nonstop2h 50m
Deal found 9/13![Frontier logo]()
$159
This Expedia deal was found by Cheapflights users on 9/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/165:15 pm -
Nonstop2h 56m
Sun 10/189:16 pm -
1 stop14h 00m
Deal found 9/13![Frontier logo]()
$161
This Frontier deal was found by Cheapflights users on 9/14. 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.
Sun 10/115:15 pm -
Nonstop2h 56m
Thu 10/2210:03 am -
Nonstop2h 50m
Deal found 9/14![Frontier logo]()
$162
This Frontier deal was found by Cheapflights users on 9/14. 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.
Fri 11/135:06 pm -
Nonstop3h 02m
Sun 11/1510:50 am -
Nonstop2h 48m
Deal found 9/14![Frontier logo]()
$164
This CheapOair deal was found by Cheapflights users on 9/14. 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.
Thu 10/85:15 pm -
Nonstop2h 56m
Sun 10/1110:03 am -
Nonstop2h 50m
Deal found 9/14![Frontier logo]()
$165
This Frontier deal was found by Cheapflights users on 9/13. 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 10/75:44 pm -
Nonstop2h 56m
Fri 10/910:53 am -
Nonstop2h 50m
Deal found 9/13![Frontier logo]()
$166
This Kiwi.com deal was found by Cheapflights users on 9/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/115:07 pm -
1 stop16h 28m
Sun 11/157:35 pm -
1 stop15h 41m
Deal found 9/17![Multiple Airlines logo]()
$250
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 September 18, 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 September 18, 2026.
This Southwest deal was found by Cheapflights users on 9/15. 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 10/106:05 am -
1 stop7h 15m
Tue 10/138:45 am -
1 stop4h 40m
Deal found 9/15![Southwest logo]()
$258
This Delta deal was found by Cheapflights users on 9/13. 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 10/136:20 am -
Nonstop3h 04m
Sat 10/172:30 pm -
Nonstop2h 42m
Deal found 9/13![Delta logo]()
$267
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 10/142:13 pm -
Nonstop2h 43m
Sat 10/173:28 pm -
Nonstop2h 32m
Deal found 9/13![Alaska Airlines logo]()
$267
This United Airlines deal was found by Cheapflights users on 9/16. 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.
Thu 11/196:00 am -
1 stop6h 22m
Sun 11/221:25 pm -
1 stop6h 50m
Deal found 9/16![United Airlines logo]()
$309
This Kiwi.com deal was found by Cheapflights users on 9/15. 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 9/302:30 pm -
2 stops31h 14m
Mon 10/56:00 am -
1 stop10h 59m
Deal found 9/15![Multiple Airlines logo]()
$420
This Southwest deal was found by Cheapflights users on 9/13. 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.
Tue 10/203:10 pm -
2 stops7h 50m
Wed 10/2112:05 pm -
2 stops7h 35m
Deal found 9/13![Southwest logo]()
$269
This Delta deal was found by Cheapflights users on 9/15. 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.
Thu 10/156:00 pm -
1 stop5h 59m
Fri 10/165:15 pm -
1 stop6h 40m
Deal found 9/15![Delta logo]()
$270
This Southwest deal was found by Cheapflights users on 9/17. 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.
Wed 12/212:50 pm -
2 stops8h 05m
Sat 12/56:45 am -
1 stop7h 25m
Deal found 9/17![Southwest logo]()
$276
This Delta deal was found by Cheapflights users on 9/16. 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 10/316:20 am -
Nonstop3h 04m
Mon 11/22:30 pm -
Nonstop2h 42m
Deal found 9/16![Delta logo]()
$282
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 11/136:00 am -
1 stop5h 30m
Mon 11/165:00 am -
1 stop4h 52m
Deal found 9/15![Alaska Airlines logo]()
$340
This Delta deal was found by Cheapflights users on 9/13. 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.
Thu 10/1511:56 am -
Nonstop2h 59m
Sat 10/177:56 pm -
Nonstop2h 47m
Deal found 9/13![Delta logo]()
$282
This United Airlines deal was found by Cheapflights users on 9/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/285:00 am -
1 stop7h 52m
Tue 1/55:00 am -
1 stop7h 33m
Deal found 9/17![United Airlines logo]()
$376
This Southwest deal was found by Cheapflights users on 9/17. 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.
Mon 11/1612:50 pm -
2 stops8h 05m
Thu 11/195:40 am -
1 stop6h 30m
Deal found 9/17![Southwest logo]()
$312
This Alaska Airlines deal was found by Cheapflights users on 9/17. 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 11/244:01 pm -
1 stop5h 53m
Wed 12/27:45 am -
Nonstop2h 16m
Deal found 9/17![Alaska Airlines logo]()
$352
This Delta deal was found by Cheapflights users on 9/17. 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.
Mon 11/235:04 pm -
1 stop6h 47m
Fri 11/275:45 am -
1 stop6h 35m
Deal found 9/17![Delta logo]()
$309
This Southwest deal was found by Cheapflights users on 9/14. 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.
Sun 10/410:55 am -
1 stop4h 45m
Sun 10/47:35 pm -
1 stop4h 20m
Deal found 9/14![Southwest logo]()
$313
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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.
Sun 10/186:02 am -
Nonstop2h 47m
Sun 10/189:06 pm -
Nonstop2h 36m
Deal found 9/13![Alaska Airlines logo]()
$357
This Southwest deal was found by Cheapflights users on 9/16. 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.
Thu 11/193:20 pm -
2 stops6h 10m
Sun 11/225:10 am -
1 stop5h 40m
Deal found 9/16![Southwest logo]()
$324
This Alaska Airlines deal was found by Cheapflights users on 9/14. 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 12/244:01 pm -
1 stop4h 56m
Wed 12/306:00 am -
1 stop5h 10m
Deal found 9/14![Alaska Airlines logo]()
$359
This Delta deal was found by Cheapflights users on 9/17. 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.
Thu 11/261:15 pm -
1 stop6h 23m
Tue 12/15:30 am -
1 stop5h 47m
Deal found 9/17![Delta logo]()
$335
This Southwest deal was found by Cheapflights users on 9/15. 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.
Thu 11/55:20 pm -
1 stop6h 55m
Sun 11/83:35 pm -
2 stops6h 25m
Deal found 9/15![Southwest logo]()
$324
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 11/104:09 pm -
1 stop7h 50m
Wed 11/115:00 am -
1 stop6h 18m
Deal found 9/13![Alaska Airlines logo]()
$359
This Southwest deal was found by Cheapflights users on 9/17. 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.
Fri 10/97:05 pm -
1 stop4h 45m
Sun 10/115:00 am -
1 stop4h 20m
Deal found 9/17![Southwest logo]()
$332
This Delta deal was found by Cheapflights users on 9/13. 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 10/236:20 am -
1 stop5h 42m
Sat 10/245:45 pm -
1 stop4h 58m
Deal found 9/13![Delta logo]()
$366
This Alaska Airlines deal was found by Cheapflights users on 9/13. 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 10/147:25 am -
Nonstop2h 20m
Sat 10/177:00 am -
1 stop10h 05m
Deal found 9/13![Alaska Airlines logo]()
$370
This United Airlines deal was found by Cheapflights users on 9/14. 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.
Thu 10/86:07 am -
1 stop6h 07m
Sun 10/115:05 am -
1 stop7h 41m
Deal found 9/14![United Airlines logo]()
$559
This Southwest deal was found by Cheapflights users on 9/16. 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.
Thu 10/2911:00 am -
1 stop4h 40m
Sun 11/13:35 pm -
2 stops8h 00m
Deal found 9/16![Southwest logo]()
$333
This Delta deal was found by Cheapflights users on 9/14. 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 12/295:38 pm -
1 stop6h 21m
Sat 1/24:15 pm -
1 stop6h 22m
Deal found 9/14![Delta logo]()
$368
This Alaska Airlines deal was found by Cheapflights users on 9/17. 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.
Thu 10/296:02 am -
1 stop7h 16m
Mon 11/21:49 pm -
1 stop4h 28m
Deal found 9/17![Alaska Airlines logo]()
$391
This Southwest deal was found by Cheapflights users on 9/15. 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 10/1612:40 pm -
2 stops9h 55m
Sun 10/186:15 am -
1 stop5h 50m
Deal found 9/15![Southwest logo]()
$343
Last-minute flights from Ontario to WashingtonDiscover last-minute flight deals from Ontario to Washington. Data last updated September 18, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Washington. Data last updated September 18, 2026 and is based on user searches.
This Priceline deal was found by Cheapflights users on 9/14. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/195:34 pm -
Nonstop2h 56m
Mon 10/510:53 am -
Nonstop2h 52m
Deal found 9/14![Frontier logo]()
$170
This Frontier deal was found by Cheapflights users on 9/13. 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 10/75:44 pm -
Nonstop2h 56m
Fri 10/910:53 am -
Nonstop2h 50m
Deal found 9/13![Frontier logo]()
$166
This CheapOair deal was found by Cheapflights users on 9/14. 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.
Thu 10/85:15 pm -
Nonstop2h 56m
Sun 10/1110:03 am -
Nonstop2h 50m
Deal found 9/14![Frontier logo]()
$165
This Kiwi.com deal was found by Cheapflights users on 9/14. 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.
Fri 10/95:15 pm -
Nonstop2h 56m
Sun 10/1110:03 am -
Nonstop2h 50m
Deal found 9/14![Frontier logo]()
$158
This Frontier deal was found by Cheapflights users on 9/13. 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.
Fri 10/95:15 pm -
Nonstop2h 56m
Thu 10/1510:03 am -
Nonstop2h 50m
Deal found 9/13![Frontier logo]()
$159
This Frontier deal was found by Cheapflights users on 9/14. 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.
Sun 10/115:15 pm -
Nonstop2h 56m
Thu 10/2210:03 am -
Nonstop2h 50m
Deal found 9/14![Frontier logo]()
$162
This Frontier deal was found by Cheapflights users on 9/14. 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.
Thu 10/155:15 pm -
Nonstop2h 56m
Mon 10/1910:53 am -
Nonstop2h 50m
Deal found 9/14![Frontier logo]()
$157
This Expedia deal was found by Cheapflights users on 9/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/151:38 pm -
1 stop20h 10m
Sun 10/1810:03 am -
Nonstop2h 50m
Deal found 9/13![Frontier logo]()
$164
This Expedia deal was found by Cheapflights users on 9/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/165:15 pm -
Nonstop2h 56m
Mon 10/199:16 pm -
1 stop19h 14m
Deal found 9/13![Frontier logo]()
$156
This Expedia deal was found by Cheapflights users on 9/13. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/165:15 pm -
Nonstop2h 56m
Sun 10/189:16 pm -
1 stop14h 00m
Deal found 9/13![Frontier logo]()
$161
This Frontier deal was found by Cheapflights users on 9/14. 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.
Thu 10/295:06 pm -
Nonstop3h 02m
Fri 10/3010:50 am -
Nonstop2h 48m
Deal found 9/14![Frontier logo]()
$154
This Frontier deal was found by Cheapflights users on 9/13. 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.
Thu 10/295:06 pm -
Nonstop3h 02m
Sun 11/110:50 am -
Nonstop2h 48m
Deal found 9/13![Frontier logo]()
$155
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 September 18, 2026.
Search for one-way flight options from Ontario to Washington. Find affordable one-way fares based on user searches. Data last updated September 18, 2026.
This deal was found by Cheapflights users on 9/15. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/226:00 am -
Nonstop3h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Frontier logo]()
$69
This Frontier deal was found by Cheapflights users on 9/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/86:20 am -
1 stop9h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$83
This Frontier deal was found by Cheapflights users on 9/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/310:05 am -
1 stop6h 43m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$86
This Super.com deal was found by Cheapflights users on 9/18. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/56:39 am -
Nonstop3h 06m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Frontier logo]()
$87
This Super.com deal was found by Cheapflights users on 9/17. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/145:25 pm -
1 stop18h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Frontier logo]()
$88
This Booking.com deal was found by Cheapflights users on 9/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2111:26 am -
1 stop24h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$89
This Trip.com deal was found by Cheapflights users on 9/16. 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.
Wed 11/1811:52 am -
1 stop23h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$91
This FlightHub deal was found by Cheapflights users on 9/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/26:39 am -
Nonstop3h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$91
This Booking.com deal was found by Cheapflights users on 9/16. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/151:38 pm -
1 stop22h 02m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$92
This Frontier deal was found by Cheapflights users on 9/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/16:20 am -
1 stop9h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$93
This CheapOair deal was found by Cheapflights users on 9/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/210:32 pm -
1 stop18h 16m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$94
This FlightHub deal was found by Cheapflights users on 9/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/198:35 pm -
1 stop16h 28m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Frontier logo]()
$95
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 September 18, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $132 (Frontier) |
One-way from | $69 |
Popular in | June |
Cheapest in | March |
Average price | $260 |
Good round-trip deal | $246 or less |
Good one-way deal | $154 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 7,457,451 searches. Data last updated September 18, 2026.
Use the filters below to find and compare flights from Ontario to Washington that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Wed 10/28
6:40 am-10:10 am
1 stop3h 30m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$99
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Tue 11/17
5:04 pm-11:51 pm
1 stop6h 47m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$103
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Wed 11/11
3:30 pm-9:30 pm
1 stop6h 00m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$103
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Sat 11/14
1:10 pm-7:50 pm
1 stop6h 40m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$103
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Mon 11/16
5:04 pm-11:51 pm
1 stop6h 47m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$116
OntarioSeattle
ONT Ontario - SEA Seattle/Tacoma Intl
ONTSEA
Ontario
Sat 11/7
1:25 pm-9:55 pm
1 stop8h 30m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$129
OntarioSeattle
ONT Ontario - SEA Seattle/Tacoma Intl
ONTSEA
Ontario
Sat 10/10
3:10 pm-10:25 pm
1 stop7h 15m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$129
OntarioSpokane
ONT Ontario - GEG Spokane
ONTGEG
Ontario
Wed 10/21
6:02 am-12:54 pm
1 stop6h 52m
Spokane
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$131
OntarioSeattle
ONT Ontario - SEA Seattle/Tacoma Intl
ONTSEA
Ontario
Tue 10/27
7:25 am-12:05 pm
1 stop4h 40m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$144
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Fri 11/13
5:04 pm-11:51 pm
1 stop6h 47m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$149
Showing 1-10 of 60 resultsSorted by cheapest first
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-EAT
ONT-SEA
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-EAT
ONT-SEA
What is the cheapest month to book a flight from Ontario to State of Washington?
Currently, January is the cheapest month in which you can book a flight from Ontario to State of Washington (average of $214). Flying from Ontario to State of Washington in July is currently the most expensive (average of $346). 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 September 18, 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 morning tend to be the most expensive. A flight in the afternoon could potentially save you up to 26% on airfare.
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 September 18, 2026.
The most flights from ONT to USWA are scheduled on a Wednesday (21 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (8 on average).
How much does it cost to fly round-trip from Ontario to State of Washington?
Airfare is below average for this route at the moment.
Ontario to State of Washington flights typically cost between $229 and $361 in November.The cheapest round-trip price found within the last 5 days was $132 on Frontier (Nov 5-Nov 9).
How far ahead should I book a flight from Ontario to State of Washington?
Booking 71 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to State of Washington. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
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 September 12, 2026.
Travelers seeking maximum savings on their Ontario to State of Washington flight should consider departing on Saturday afternoons when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
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 September 18, 2026.
Get a feel of what it's like to fly with Southwest,Alaska Airlines, andDelta 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.
Crew
8.6
Overall
8.0
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Overall
8.0
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Overall
8.0
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Overall
8.0
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Overall
8.0
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Crew
8.6
Overall
8.0
Food
7.0
Comfort
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
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
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Washington by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Washington by cabin class
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 September 18, 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 7,457,451 searches. Data last updated September 18, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$88 | Average$324 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$90 | Average$238 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$99 | Average$348 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$139 | Average$415 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$150 | Average$360 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$176 | Average$384 | FlexibilityNo cancel fee | On-time69% |