$77+ Cheap flights from Washington to Ontario (ONT)
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 11/21. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ONT
Nov 24 — Dec 11
Round-trip
1 adult, Economy
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Find cheap flights from Washington to Ontario 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 Washington to OntarioExplore the most affordable flight options available from Washington to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 25, 2026.
Explore the most affordable flight options available from Washington to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 25, 2026.
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 11/169:37 am -
1 stop24h 03m
Wed 12/28:00 am -
1 stop25h 01m
Deal found 10/23![Multiple Airlines logo]()
$145
This Frontier deal was found by Cheapflights users on 10/21. 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 11/1910:50 am -
Nonstop2h 48m
Tue 11/246:00 am -
Nonstop3h 03m
Deal found 10/21![Frontier logo]()
$153
This Cheapflightsfares deal was found by Cheapflights users on 10/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2110:18 am -
Nonstop2h 48m
Wed 11/256:00 am -
Nonstop3h 03m
Deal found 10/21![Frontier logo]()
$154
This Cheapflightsfares deal was found by Cheapflights users on 10/23. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1910:50 am -
Nonstop2h 48m
Mon 11/306:00 am -
Nonstop3h 03m
Deal found 10/23![Frontier logo]()
$156
This Frontier deal was found by Cheapflights users on 10/22. 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 11/1910:50 am -
Nonstop2h 48m
Mon 11/236:00 am -
Nonstop3h 03m
Deal found 10/22![Frontier logo]()
$158
This Frontier deal was found by Cheapflights users on 10/22. 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 11/1910:50 am -
Nonstop2h 48m
Fri 11/276:00 am -
Nonstop3h 03m
Deal found 10/22![Frontier logo]()
$160
This Cheapflightsfares deal was found by Cheapflights users on 10/24. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/910:50 am -
Nonstop2h 48m
Thu 11/125:06 pm -
Nonstop3h 02m
Deal found 10/24![Frontier logo]()
$161
This Cheapflightsfares deal was found by Cheapflights users on 10/23. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2410:18 am -
Nonstop2h 48m
Wed 11/2510:55 am -
1 stop25h 42m
Deal found 10/23![Frontier logo]()
$163
This Frontier deal was found by Cheapflights users on 10/22. 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 11/1910:50 am -
Nonstop2h 48m
Wed 11/256:45 am -
1 stop8h 37m
Deal found 10/22![Frontier logo]()
$164
This Frontier deal was found by Cheapflights users on 10/24. 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 11/184:27 pm -
1 stop7h 24m
Tue 11/246:00 am -
Nonstop3h 03m
Deal found 10/24![Frontier logo]()
$165
This Expedia deal was found by Cheapflights users on 10/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1910:50 am -
Nonstop2h 48m
Sat 11/216:00 am -
Nonstop3h 03m
Deal found 10/20![Frontier logo]()
$168
This Southwest deal was found by Cheapflights users on 10/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1010:55 am -
1 stop5h 20m
Thu 11/126:25 pm -
1 stop5h 25m
Deal found 10/20![Southwest logo]()
$235
Best flights from Washington to OntarioDiscover carefully curated flight deals from Washington to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 25, 2026.
Discover carefully curated flight deals from Washington to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 25, 2026.
This Southwest deal was found by Cheapflights users on 10/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/107:35 am -
2 stops10h 15m
Thu 11/126:25 pm -
1 stop5h 25m
Deal found 10/20![Southwest logo]()
$246
This Delta deal was found by Cheapflights users on 10/24. 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.
Wed 1/67:50 pm -
Nonstop2h 45m
Tue 1/123:31 pm -
Nonstop3h 05m
Deal found 10/24![Delta logo]()
$247
This Alaska Airlines deal was found by Cheapflights users on 10/20. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/209:23 pm -
Nonstop2h 36m
Fri 1/16:00 am -
Nonstop2h 52m
Deal found 10/20![Alaska Airlines logo]()
$263
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 1/88:22 pm -
1 stop11h 43m
Sun 1/104:14 pm -
2 stops27h 18m
Deal found 10/23![Multiple Airlines logo]()
$326
This United Airlines deal was found by Cheapflights users on 10/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/111:10 pm -
1 stop4h 51m
Sat 11/145:00 am -
1 stop7h 47m
Deal found 10/20![United Airlines logo]()
$335
This Delta deal was found by Cheapflights users on 10/24. 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 1/97:50 pm -
Nonstop2h 45m
Wed 1/133:31 pm -
Nonstop3h 05m
Deal found 10/24![Delta logo]()
$247
This Southwest deal was found by Cheapflights users on 10/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/225:50 pm -
2 stops5h 50m
Thu 11/2612:35 pm -
1 stop4h 05m
Deal found 10/20![Southwest logo]()
$274
This Alaska Airlines deal was found by Cheapflights users on 10/21. 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.
Mon 2/15:47 pm -
1 stop4h 54m
Mon 3/16:22 pm -
1 stop4h 06m
Deal found 10/21![Alaska Airlines logo]()
$283
This Delta deal was found by Cheapflights users on 10/23. 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 11/218:11 pm -
Nonstop2h 49m
Tue 11/247:00 am -
Nonstop3h 01m
Deal found 10/23![Delta logo]()
$260
This Alaska Airlines deal was found by Cheapflights users on 10/22. 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 11/1010:06 am -
1 stop5h 20m
Wed 11/114:09 pm -
1 stop7h 50m
Deal found 10/22![Alaska Airlines logo]()
$283
This Delta deal was found by Cheapflights users on 10/23. 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.
Sun 11/228:11 pm -
Nonstop2h 49m
Wed 11/257:00 am -
Nonstop3h 01m
Deal found 10/23![Delta logo]()
$260
This Southwest deal was found by Cheapflights users on 10/24. 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 12/126:45 am -
1 stop7h 25m
Tue 1/53:20 pm -
2 stops7h 00m
Deal found 10/24![Southwest logo]()
$302
This Delta deal was found by Cheapflights users on 10/23. 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 12/42:30 pm -
Nonstop2h 45m
Sun 12/65:55 pm -
Nonstop3h 05m
Deal found 10/23![Delta logo]()
$262
This Southwest deal was found by Cheapflights users on 10/23. 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 2/155:00 am -
1 stop6h 45m
Sun 2/215:15 pm -
1 stop6h 25m
Deal found 10/23![Southwest logo]()
$311
This United Airlines deal was found by Cheapflights users on 10/23. 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.
Sun 11/225:23 pm -
1 stop5h 25m
Fri 11/279:25 am -
1 stop5h 14m
Deal found 10/23![United Airlines logo]()
$417
This Delta deal was found by Cheapflights users on 10/22. 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 11/98:11 pm -
Nonstop2h 49m
Sat 11/147:00 am -
Nonstop3h 01m
Deal found 10/22![Delta logo]()
$289
This Alaska Airlines deal was found by Cheapflights users on 10/24. 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 12/37:31 pm -
1 stop4h 23m
Fri 12/117:10 am -
1 stop4h 31m
Deal found 10/24![Alaska Airlines logo]()
$355
This Southwest deal was found by Cheapflights users on 10/20. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/65:50 pm -
1 stop4h 30m
Mon 11/95:30 pm -
2 stops7h 35m
Deal found 10/20![Southwest logo]()
$342
This Alaska Airlines deal was found by Cheapflights users on 10/20. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/222:16 pm -
1 stop5h 50m
Tue 12/298:59 pm -
Nonstop2h 52m
Deal found 10/20![Alaska Airlines logo]()
$362
This Delta deal was found by Cheapflights users on 10/23. 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 12/288:25 am -
Nonstop2h 54m
Fri 1/17:00 am -
Nonstop3h 05m
Deal found 10/23![Delta logo]()
$301
This United Airlines deal was found by Cheapflights users on 10/22. 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 11/61:47 pm -
1 stop6h 28m
Tue 11/105:00 am -
1 stop8h 06m
Deal found 10/22![United Airlines logo]()
$499
This Delta deal was found by Cheapflights users on 10/24. 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 1/283:05 pm -
1 stop7h 38m
Mon 2/15:05 pm -
1 stop6h 37m
Deal found 10/24![Delta logo]()
$319
This Priceline deal was found by Cheapflights users on 10/21. 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.
Wed 2/36:01 pm -
1 stop4h 40m
Sat 2/67:10 am -
1 stop4h 42m
Deal found 10/21![Alaska Airlines logo]()
$401
This United Airlines deal was found by Cheapflights users on 10/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/1212:59 pm -
1 stop8h 12m
Sun 12/131:40 pm -
1 stop7h 34m
Deal found 10/20![United Airlines logo]()
$511
This Delta deal was found by Cheapflights users on 10/21. 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 1/85:45 am -
1 stop6h 45m
Tue 1/123:30 pm -
1 stop5h 35m
Deal found 10/21![Delta logo]()
$322
This American Airlines deal was found by Cheapflights users on 10/22. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/213:54 pm -
2 stops20h 51m
Sat 11/281:30 pm -
2 stops10h 29m
Deal found 10/22![American Airlines logo]()
$1,310
This Alaska Airlines deal was found by Cheapflights users on 10/24. 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 12/55:00 am -
1 stop6h 13m
Sat 12/126:00 am -
1 stop8h 34m
Deal found 10/24![Alaska Airlines logo]()
$412
This Alaska Airlines deal was found by Cheapflights users on 10/22. 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 11/2612:18 pm -
1 stop4h 59m
Sat 12/56:17 pm -
1 stop4h 41m
Deal found 10/22![Alaska Airlines logo]()
$426
This Delta deal was found by Cheapflights users on 10/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/75:57 pm -
1 stop6h 00m
Sun 12/131:11 pm -
1 stop5h 41m
Deal found 10/20![Delta logo]()
$367
This Alaska Airlines deal was found by Cheapflights users on 10/22. 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 1/2012:32 pm -
1 stop7h 30m
Wed 1/2711:36 am -
2 stops11h 00m
Deal found 10/22![Alaska Airlines logo]()
$431
Last-minute flights from Washington to OntarioDiscover last-minute flight deals from Washington to Ontario. Data last updated October 25, 2026 and is based on user searches.
Discover last-minute flight deals from Washington to Ontario. Data last updated October 25, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 10/23. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/910:50 am -
Nonstop2h 48m
Thu 11/125:06 pm -
Nonstop3h 02m
Deal found 10/23![Frontier logo]()
$161
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 11/169:37 am -
1 stop24h 03m
Wed 12/28:00 am -
1 stop25h 01m
Deal found 10/23![Multiple Airlines logo]()
$145
This Frontier deal was found by Cheapflights users on 10/24. 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 11/184:27 pm -
1 stop7h 24m
Tue 11/246:00 am -
Nonstop3h 03m
Deal found 10/24![Frontier logo]()
$165
This Frontier deal was found by Cheapflights users on 10/21. 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 11/1910:50 am -
Nonstop2h 48m
Tue 11/246:00 am -
Nonstop3h 03m
Deal found 10/21![Frontier logo]()
$153
This Cheapflightsfares deal was found by Cheapflights users on 10/23. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1910:50 am -
Nonstop2h 48m
Mon 11/306:00 am -
Nonstop3h 03m
Deal found 10/23![Frontier logo]()
$156
This Frontier deal was found by Cheapflights users on 10/22. 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 11/1910:50 am -
Nonstop2h 48m
Mon 11/236:00 am -
Nonstop3h 03m
Deal found 10/22![Frontier logo]()
$158
This Frontier deal was found by Cheapflights users on 10/22. 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 11/1910:50 am -
Nonstop2h 48m
Fri 11/276:00 am -
Nonstop3h 03m
Deal found 10/22![Frontier logo]()
$160
This Frontier deal was found by Cheapflights users on 10/22. 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 11/1910:50 am -
Nonstop2h 48m
Wed 11/256:45 am -
1 stop8h 37m
Deal found 10/22![Frontier logo]()
$164
This Expedia deal was found by Cheapflights users on 10/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1910:50 am -
Nonstop2h 48m
Sat 11/216:00 am -
Nonstop3h 03m
Deal found 10/20![Frontier logo]()
$168
This Cheapflightsfares deal was found by Cheapflights users on 10/21. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2110:18 am -
Nonstop2h 48m
Tue 11/246:00 am -
Nonstop3h 03m
Deal found 10/21![Frontier logo]()
$154
This Super.com deal was found by Cheapflights users on 10/22. 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 11/2110:18 am -
Nonstop2h 48m
Wed 11/256:00 am -
Nonstop3h 03m
Deal found 10/22![Frontier logo]()
$167
This Cheapflightsfares deal was found by Cheapflights users on 10/23. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/2410:18 am -
Nonstop2h 48m
Wed 11/2510:55 am -
1 stop25h 42m
Deal found 10/23![Frontier logo]()
$163
One-way flights from Washington to OntarioSearch for one-way flight options from Washington to Ontario. Find affordable one-way fares based on user searches. Data last updated October 25, 2026.
Search for one-way flight options from Washington to Ontario. Find affordable one-way fares based on user searches. Data last updated October 25, 2026.
This Super.com deal was found by Cheapflights users on 10/21. 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 11/2110:18 am -
Nonstop2h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$77
This Super.com deal was found by Cheapflights users on 10/22. 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.
Thu 11/1210:50 am -
Nonstop2h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Frontier logo]()
$83
This Kiwi.com deal was found by Cheapflights users on 10/22. 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 11/169:11 pm -
1 stop12h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Multiple Airlines logo]()
$85
This Trip.com deal was found by Cheapflights users on 10/23. 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.
Tue 11/2410:18 am -
Nonstop2h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 10/24. 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 12/216:25 pm -
1 stop13h 36m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/24![Frontier logo]()
$87
This Kiwi.com deal was found by Cheapflights users on 10/23. 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 12/78:56 pm -
1 stop21h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Frontier logo]()
$88
This Cheapflightsfares deal was found by Cheapflights users on 10/22. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/148:56 pm -
1 stop21h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Frontier logo]()
$90
This Frontier deal was found by Cheapflights users on 10/21. 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.
Mon 11/3010:18 am -
Nonstop2h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$94
This Kiwi.com deal was found by Cheapflights users on 10/22. 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 12/249:16 pm -
1 stop9h 51m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Multiple Airlines logo]()
$110
This Southwest deal was found by Cheapflights users on 10/23. 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 11/95:00 am -
1 stop5h 40m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Southwest logo]()
$118
This Southwest deal was found by Cheapflights users on 10/23. 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 11/107:35 am -
2 stops10h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/23![Southwest logo]()
$129
This Kiwi.com deal was found by Cheapflights users on 10/22. 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.
Sun 11/221:05 pm -
2 stops43h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Multiple Airlines logo]()
$132
Find flight deals from Washington to Ontario
Keep the following information in mind while searching for Washington to Ontario flight deals. Data was last updated October 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $145 (Kiwi.com) |
One-way from | $77 (Super.com) |
Popular in | December |
Cheapest in | March |
Average price | $273 |
Good round-trip deal | $215 or less |
Good one-way deal | $125 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Washington to Ontario 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 October 25, 2026.
Use the filters below to find and compare flights from Washington to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
SpokaneOntario
GEG Spokane - ONT Ontario
GEGONT
Spokane
Tue 11/10
5:35 am-12:50 pm
1 stop7h 15m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$118
SpokaneOntario
GEG Spokane - ONT Ontario
GEGONT
Spokane
Mon 11/9
5:50 pm-11:40 pm
2 stops5h 50m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$123
PascoOntario
PSC Pasco Tri Cities - ONT Ontario
PSCONT
Pasco Tri Cities
Sun 11/22
1:05 pm-8:30 am
2 stops43h 25m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$132
SeattleOntario
SEA Seattle/Tacoma Intl - ONT Ontario
SEAONT
Seattle/Tacoma Intl
Tue 11/17
7:40 am-11:55 am
1 stop4h 15m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$136
SeattleOntario
SEA Seattle/Tacoma Intl - ONT Ontario
SEAONT
Seattle/Tacoma Intl
Tue 1/5
8:05 pm-10:41 pm
Nonstop2h 36m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$139
SeattleOntario
SEA Seattle/Tacoma Intl - ONT Ontario
SEAONT
Seattle/Tacoma Intl
Tue 12/8
8:25 am-11:17 am
Nonstop2h 52m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$139
Quickest round-trip
SeattleOntario
SEA Seattle/Tacoma Intl - ONT Ontario
SEAONT
Seattle/Tacoma Intl
Sat 12/12
1:33 pm-4:05 pm
Nonstop2h 32m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$139
SeattleOntario
SEA Seattle/Tacoma Intl - ONT Ontario
SEAONT
Seattle/Tacoma Intl
Tue 12/15
5:15 am-11:55 am
2 stops6h 40m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$139
SpokaneOntario
GEG Spokane - ONT Ontario
GEGONT
Spokane
Sat 2/20
9:10 am-1:57 pm
1 stop4h 47m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$142
SpokaneOntario
GEG Spokane - ONT Ontario
GEGONT
Spokane
Mon 11/23
3:26 pm-11:00 pm
1 stop7h 34m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$142
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Washington to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Washington with our price prediction graph.
BLI-ONT
SEA-ONT
GEG-ONT
PSC-ONT
YKM-ONT
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 Washington to Ontario
USWA-ONT
BLI-ONT
SEA-ONT
GEG-ONT
PSC-ONT
What is the cheapest month to book a flight from State of Washington to Ontario?
Currently, May is the cheapest month in which you can book a flight from State of Washington to Ontario (average of $262). Flying from State of Washington to Ontario in February is currently the most expensive (average of $373). 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 WA to ONT?
Find hourly flight availability from Washington to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 25, 2026.
A simple way to save on the total cost of your ticket is to fly from State of Washington to Ontario in the morning. If you’re flexible enough to do this you can expect to save up to 18% on your trip compared to booking a flight in the afternoon.
Weekly flight availability from State of Washington to Ontario
Explore weekly flight availability from Washington to Ontario. 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 October 25, 2026.
The most flights from USWA to ONT are scheduled on a Friday (21 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (2 on average).
How much does it cost to fly round-trip from State of Washington to Ontario?
Airfare is below average for this route at the moment.
State of Washington to Ontario flights typically cost between $224 and $380 in November.The cheapest round-trip price found within the last 5 days was $153 on Frontier (Nov 19-Nov 24).
How far ahead should I book a flight from State of Washington to Ontario?
Booking 73 days in advance of your planned departure date is, on average, the best time to get cheap flights from State of Washington to Ontario. 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 State of Washington to Ontario?
Use this chart to determine the cheapest time to fly round-trip from Washington to Ontario. Price data was last updated on October 24, 2026.
Travelers seeking maximum savings on their State of Washington to Ontario flight should consider departing on Wednesday mornings 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.
Related info for your journey
Find useful and relevant information for your journey from Washington to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Ontario flight routes
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Alternative routes for Washington to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Washington to Ontario by cabin class
Find flights from Washington to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on October 25, 2026.
Washington and Ontario flights
Browse other Washington and Ontario flight options. Last updated on October 25, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Washington to Ontario flights
Consider these flights traveling from Washington to Ontario.
Top 6 airlines flying from Washington to Ontario
Discover the top 6 airlines that operate flights from Washington to Ontario. 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 October 25, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$93 | Average$235 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$107 | Average$343 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$138 | Average$387 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$150 | Average$338 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$150 | Average$391 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$328 | Average$387 | FlexibilityNo cancel fee | On-time85% |