$91+ Cheap flights from Washington, D.C. (WAS) 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 11/10. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — ONT
Nov 21 — Nov 281
Round-trip
1 adult, Economy
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Find cheap flights from Washington, D.C. 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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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Washington, D.C. to Ontario
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Cheapest flights from Washington, D.C. to OntarioExplore the most affordable flight options available from Washington, D.C. to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 22, 2026.
Explore the most affordable flight options available from Washington, D.C. to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 22, 2026.
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1011:37 am -
2 stops25h 03m
Thu 11/122:23 pm -
2 stops17h 29m
Deal found 10/21![Frontier logo]()
$170
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/97:00 am -
1 stop30h 35m
Mon 11/166:30 am -
1 stop7h 17m
Deal found 10/20![Frontier logo]()
$182
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.
Tue 11/1011:37 am -
1 stop8h 01m
Mon 11/168:03 pm -
1 stop11h 49m
Deal found 10/21![Frontier logo]()
$184
This Frontier deal was found by Cheapflights users on 10/19. 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.
Sat 12/51:40 pm -
1 stop11h 37m
Sat 12/126:00 am -
1 stop12h 59m
Deal found 10/19![Frontier logo]()
$184
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1212:31 pm -
1 stop9h 37m
Mon 11/168:03 pm -
1 stop12h 33m
Deal found 10/20![Frontier logo]()
$184
This Flightnetwork 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:00 pm -
1 stop19h 42m
Wed 11/1811:52 am -
1 stop6h 58m
Deal found 10/20![Frontier logo]()
$190
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:00 am -
1 stop18h 20m
Thu 12/106:00 am -
1 stop7h 55m
Deal found 10/21![Frontier logo]()
$193
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1912:31 pm -
1 stop9h 37m
Sat 11/2110:47 pm -
1 stop27h 23m
Deal found 10/20![Frontier logo]()
$193
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/191:00 pm -
1 stop24h 45m
Thu 11/2611:40 am -
1 stop7h 15m
Deal found 10/20![Frontier logo]()
$194
This Frontier deal was found by Cheapflights users on 10/19. 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.
Thu 12/31:33 pm -
1 stop13h 44m
Tue 12/156:00 am -
1 stop12h 59m
Deal found 10/19![Frontier logo]()
$198
This Frontier deal was found by Cheapflights users on 10/19. 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.
Mon 11/231:09 pm -
1 stop9h 27m
Thu 11/262:01 pm -
1 stop11h 34m
Deal found 10/19![Frontier logo]()
$198
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1012:31 pm -
2 stops14h 20m
Mon 11/168:03 pm -
1 stop12h 33m
Deal found 10/20![Frontier logo]()
$201
Best flights from Washington, D.C. to OntarioDiscover carefully curated flight deals from Washington, D.C. to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 22, 2026.
Discover carefully curated flight deals from Washington, D.C. to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 22, 2026.
This Delta deal was found by Cheapflights users on 10/19. 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.
Thu 12/36:00 am -
1 stop8h 07m
Mon 12/1411:08 pm -
1 stop7h 08m
Deal found 10/19![Delta logo]()
$314
This Southwest deal was found by Cheapflights users on 10/19. 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.
Thu 2/186:05 am -
1 stop9h 35m
Sun 2/216:45 pm -
2 stops10h 50m
Deal found 10/19![Southwest logo]()
$319
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/139:52 pm -
2 stops15h 50m
Sat 11/145:07 pm -
2 stops12h 55m
Deal found 10/21![Frontier logo]()
$335
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.
Wed 11/47:46 am -
1 stop10h 27m
Tue 11/104:09 pm -
1 stop10h 35m
Deal found 10/20![Alaska Airlines logo]()
$348
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 12/164:30 pm -
1 stop8h 29m
Wed 1/69:45 am -
1 stop9h 45m
Deal found 10/20![United Airlines logo]()
$373
This Delta deal was found by Cheapflights users on 10/17. 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 1/237:00 am -
1 stop7h 27m
Thu 1/286:00 am -
1 stop7h 17m
Deal found 10/17![Delta logo]()
$371
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 2/134:35 pm -
1 stop8h 04m
Sat 2/206:30 am -
1 stop8h 50m
Deal found 10/20![United Airlines logo]()
$373
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/34:05 pm -
2 stops9h 00m
Sun 12/612:40 pm -
1 stop9h 00m
Deal found 10/21![Southwest logo]()
$382
This Delta deal was found by Cheapflights users on 10/17. 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 12/106:00 am -
1 stop8h 07m
Mon 12/141:11 pm -
1 stop7h 36m
Deal found 10/17![Delta logo]()
$371
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/132:45 pm -
1 stop9h 54m
Tue 2/1611:20 am -
1 stop10h 57m
Deal found 10/21![United Airlines logo]()
$373
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/136:35 am -
2 stops10h 30m
Sun 11/1511:55 pm -
1 stop8h 45m
Deal found 10/21![Southwest logo]()
$384
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.
Tue 11/37:46 am -
1 stop10h 27m
Tue 11/104:09 pm -
1 stop10h 35m
Deal found 10/21![Alaska Airlines logo]()
$428
This Delta deal was found by Cheapflights users on 10/17. 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 1/77:15 am -
1 stop8h 15m
Tue 1/1212:00 pm -
1 stop9h 20m
Deal found 10/17![Delta logo]()
$371
This Alaska Airlines deal was found by Cheapflights users on 10/18. 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 12/167:00 am -
1 stop12h 05m
Mon 1/43:59 pm -
1 stop10h 46m
Deal found 10/18![Alaska Airlines logo]()
$431
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.
Sun 2/74:15 pm -
1 stop7h 45m
Sat 2/136:30 am -
1 stop8h 50m
Deal found 10/20![United Airlines logo]()
$421
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:10 am -
2 stops9h 00m
Sun 11/158:45 pm -
2 stops8h 35m
Deal found 10/21![Southwest logo]()
$431
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.
Tue 1/56:40 am -
1 stop7h 47m
Tue 1/121:00 pm -
1 stop7h 46m
Deal found 10/20![Delta logo]()
$398
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.
Thu 12/245:05 pm -
1 stop8h 26m
Thu 12/3111:52 pm -
1 stop7h 07m
Deal found 10/20![United Airlines logo]()
$439
This Alaska Airlines deal was found by Cheapflights users on 10/18. 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.
Sun 11/87:05 am -
1 stop11h 08m
Mon 11/94:09 pm -
1 stop10h 35m
Deal found 10/18![Alaska Airlines logo]()
$496
This KAYAK deal was found by Cheapflights users on 10/19. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/83:55 pm -
1 stop9h 19m
Fri 12/1112:00 pm -
1 stop8h 18m
Deal found 10/19![Delta logo]()
$432
This Southwest deal was found by Cheapflights users on 10/18. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/36:10 am -
2 stops9h 00m
Sat 11/75:35 am -
2 stops11h 20m
Deal found 10/18![Southwest logo]()
$486
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 12/42:35 pm -
1 stop9h 03m
Sun 12/66:40 pm -
1 stop9h 03m
Deal found 10/22![United Airlines logo]()
$453
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.
Thu 11/57:02 am -
1 stop11h 11m
Mon 11/94:09 pm -
1 stop10h 31m
Deal found 10/21![Alaska Airlines logo]()
$511
This Delta deal was found by Cheapflights users on 10/19. 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 12/227:00 am -
1 stop7h 56m
Fri 1/81:00 pm -
1 stop7h 46m
Deal found 10/19![Delta logo]()
$432
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/256:10 am -
1 stop7h 35m
Fri 1/17:50 am -
2 stops13h 00m
Deal found 10/21![Southwest logo]()
$510
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.
Wed 11/45:59 pm -
1 stop7h 12m
Mon 11/911:10 pm -
1 stop9h 21m
Deal found 10/20![Delta logo]()
$451
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.
Mon 11/236:39 pm -
1 stop19h 32m
Tue 12/16:00 am -
1 stop20h 37m
Deal found 10/20![Alaska Airlines logo]()
$556
This Delta deal was found by Cheapflights users on 10/19. 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.
Thu 1/146:00 am -
1 stop8h 27m
Sun 1/177:00 am -
1 stop8h 14m
Deal found 10/19![Delta logo]()
$480
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.
Thu 12/1712:05 pm -
2 stops11h 55m
Tue 12/226:27 pm -
1 stop8h 13m
Deal found 10/20![United Airlines logo]()
$603
This Alaska Airlines deal was found by Cheapflights users on 10/17. 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 12/87:00 am -
1 stop12h 05m
Mon 12/286:00 am -
1 stop8h 42m
Deal found 10/17![Alaska Airlines logo]()
$636
Last-minute flights from Washington, D.C. to OntarioDiscover last-minute flight deals from Washington, D.C. to Ontario. Data last updated October 22, 2026 and is based on user searches.
Discover last-minute flight deals from Washington, D.C. to Ontario. Data last updated October 22, 2026 and is based on user searches.
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/97:00 am -
1 stop30h 35m
Mon 11/166:30 am -
1 stop7h 17m
Deal found 10/20![Frontier logo]()
$182
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1011:37 am -
2 stops25h 03m
Thu 11/122:23 pm -
2 stops17h 29m
Deal found 10/21![Frontier logo]()
$170
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.
Tue 11/1011:37 am -
1 stop8h 01m
Mon 11/168:03 pm -
1 stop11h 49m
Deal found 10/21![Frontier logo]()
$182
This Frontier deal was found by Cheapflights users on 10/19. 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.
Tue 11/106:00 pm -
1 stop8h 51m
Thu 11/2611:40 am -
1 stop7h 15m
Deal found 10/19![Frontier logo]()
$184
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1012:31 pm -
2 stops14h 20m
Mon 11/168:03 pm -
1 stop12h 33m
Deal found 10/20![Frontier logo]()
$201
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1212:31 pm -
1 stop9h 37m
Mon 11/168:03 pm -
1 stop12h 33m
Deal found 10/20![Frontier logo]()
$184
This Flightnetwork 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:00 pm -
1 stop19h 42m
Wed 11/1811:52 am -
1 stop6h 58m
Deal found 10/20![Frontier logo]()
$190
This Cheapflightsfares 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:00 pm -
1 stop19h 42m
Sun 11/156:30 am -
1 stop26h 39m
Deal found 10/20![Frontier logo]()
$210
This Frontier deal was found by Cheapflights users on 10/19. 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.
Fri 11/136:00 pm -
1 stop8h 51m
Sat 11/146:30 am -
1 stop7h 17m
Deal found 10/19![Frontier logo]()
$208
This FlightHub 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1912:31 pm -
1 stop9h 37m
Sat 11/2110:47 pm -
1 stop27h 23m
Deal found 10/20![Frontier logo]()
$193
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/191:00 pm -
1 stop24h 45m
Thu 11/2611:40 am -
1 stop7h 15m
Deal found 10/20![Frontier logo]()
$194
This Frontier deal was found by Cheapflights users on 10/19. 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.
Mon 11/231:09 pm -
1 stop9h 27m
Thu 11/262:01 pm -
1 stop11h 34m
Deal found 10/19![Frontier logo]()
$198
One-way flights from Washington, D.C. to OntarioSearch for one-way flight options from Washington, D.C. to Ontario. Find affordable one-way fares based on user searches. Data last updated October 22, 2026.
Search for one-way flight options from Washington, D.C. to Ontario. Find affordable one-way fares based on user searches. Data last updated October 22, 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.
Tue 11/1011:37 am -
1 stop8h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$91
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/1811:37 am -
1 stop8h 01m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![Frontier logo]()
$92
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.
Thu 11/195:42 pm -
1 stop26h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$98
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1711:37 am -
2 stops15h 14m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$101
This Mytrip deal was found by Cheapflights users on 10/18. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/1712:31 pm -
2 stops24h 09m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/18![Frontier logo]()
$106
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/76:41 pm -
2 stops19h 04m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$122
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/139:52 pm -
2 stops21h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$125
This Mytrip 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/215:42 pm -
2 stops17h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$128
This Delta deal was found by Cheapflights users on 10/19. 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.
Wed 11/115:59 pm -
1 stop8h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Delta logo]()
$129
This Delta deal was found by Cheapflights users on 10/19. 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.
Wed 11/116:00 am -
1 stop8h 03m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Delta logo]()
$129
This FlightHub deal was found by Cheapflights users on 10/19. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/88:55 pm -
1 stop13h 49m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/19![Frontier logo]()
$132
This Super.com deal was found by Cheapflights users on 10/18. 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.
Thu 12/36:00 pm -
1 stop9h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/18![Frontier logo]()
$134
Find flight deals from Washington, D.C. to Ontario
Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated October 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $170 (Mytrip) |
One-way from | $91 (Super.com) |
Popular in | April |
Cheapest in | January |
Average price | $402 |
Cheapflights Fare Finder
Customize your flight search to find flights from Washington, D.C. 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 22, 2026.
Use the filters below to find and compare flights from Washington, D.C. to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Washington, D.C.Ontario
IAD Washington, D.C. Dulles Intl - ONT Ontario
IADONT
Washington, D.C. Dulles Intl
Wed 11/11
6:00 am-11:03 am
1 stop8h 03m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$129
Washington, D.C.Ontario
IAD Washington, D.C. Dulles Intl - ONT Ontario
IADONT
Washington, D.C. Dulles Intl
Sat 11/14
7:46 am-3:13 pm
1 stop10h 27m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$186
Washington, D.C.Ontario
DCA Washington, D.C. Reagan-National - ONT Ontario
DCAONT
Washington, D.C. Reagan-National
Thu 11/19
6:00 am-11:03 am
1 stop8h 03m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$186
Washington, D.C.Ontario
DCA Washington, D.C. Reagan-National - ONT Ontario
DCAONT
Washington, D.C. Reagan-National
Mon 11/16
6:00 am-11:03 am
1 stop8h 03m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$186
Washington, D.C.Ontario
IAD Washington, D.C. Dulles Intl - ONT Ontario
IADONT
Washington, D.C. Dulles Intl
Sat 3/27
6:00 am-11:27 am
1 stop8h 27m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$186
Washington, D.C.Ontario
DCA Washington, D.C. Reagan-National - ONT Ontario
DCAONT
Washington, D.C. Reagan-National
Sat 11/14
4:09 pm-8:51 pm
1 stop7h 42m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$187
Washington, D.C.Ontario
DCA Washington, D.C. Reagan-National - ONT Ontario
DCAONT
Washington, D.C. Reagan-National
Tue 2/23
2:50 pm-9:39 pm
1 stop9h 49m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$187
Washington, D.C.Ontario
IAD Washington, D.C. Dulles Intl - ONT Ontario
IADONT
Washington, D.C. Dulles Intl
Sat 1/9
2:11 pm-9:00 pm
1 stop9h 49m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$187
BaltimoreOntario
BWI Baltimore/Washington - ONT Ontario
BWIONT
Baltimore/Washington
Wed 12/16
7:00 am-4:05 pm
1 stop12h 05m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$188
BaltimoreOntario
BWI Baltimore/Washington - ONT Ontario
BWIONT
Baltimore/Washington
Wed 12/2
7:15 am-12:17 pm
1 stop8h 02m
Ontario
Wed 12/31
12:00 am-3:00 am
Nonstop0h 00m
$188
Showing 1-10 of 60 resultsSorted by cheapest first
Compare providers for flights from Washington, D.C. to Ontario
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Washington, D.C. to Ontario in October.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Washington, D.C.-Ontario flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C.-Ontario flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C.-Ontario flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Washington, D.C.-Ontario flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Washington, D.C.-Ontario flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Washington, D.C. to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from Washington, D.C. with our price prediction graph.
WAS-ONT
IAD-ONT
DCA-ONT
BWI-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, D.C. to Ontario
WAS-ONT
IAD-ONT
DCA-ONT
BWI-ONT
What is the cheapest month to book a flight from Washington, D.C. to Ontario?
Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Ontario (average of $330). Flying from Washington, D.C. to Ontario in December is currently the most expensive (average of $592). 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 WAS to ONT?
Find hourly flight availability from Washington, D.C. 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 22, 2026.
It’s typically best to fly out from Washington, D.C. to Ontario in the morning. Doing so could potentially save you 28% on the flight price compared to flying in the evening, which is usually more expensive.
How much does it cost to fly round-trip from Washington, D.C. to Ontario?
Airfare is below average for this route at the moment.
Washington, D.C. to Ontario flights typically cost between $342 and $572 in November.The cheapest round-trip price found within the last 5 days was $170 on Frontier (Nov 10-Nov 12).
How far ahead should I book a flight from Washington, D.C. to Ontario?
The best time to book flights from Washington, D.C. to Ontario is 37 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated October 22, 2026.
Read through reviews of airlines operating flights from Washington, D.C. to Ontario, such as Southwest,Delta, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
8.0
Food
7.0
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.4
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Comfort
8.0
Food
7.0
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.4
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Comfort
8.0
Food
7.0
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.4
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Comfort
8.0
Food
7.0
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.4
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Comfort
8.0
Food
7.0
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.4
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Comfort
8.0
Food
7.0
Boarding
8.1
Overall
7.9
Crew
8.6
Entertainment
7.4
Reviews
1 / 20
10.0
ExcellentWalter,May 2026
LAS - BUR
Related info for your journey
Find useful and relevant information for your journey from Washington, D.C. 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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Alternative routes for Washington, D.C. to Ontario
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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, D.C. to Ontario by cabin class
Find flights from Washington, D.C. 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 22, 2026.
Washington, D.C. and Ontario flights
Browse other Washington, D.C. and Ontario flight options. Last updated on October 22, 2026.
Other flights from Washington, D.C.
Browse through other flights departing from Washington, D.C.. Flights are based on user searches made on Cheapflights and were last updated on October 22, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Washington, D.C. to Ontario flights
Consider these flights traveling from Washington, D.C. to Ontario.
Top 5 airlines flying from Washington, D.C. to Ontario
Discover the top 5 airlines that operate flights from Washington, D.C. 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 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$165 | Average$359 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$192 | Average$461 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$239 | Average$504 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$318 | Average$517 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$340 | Average$557 | FlexibilityNo cancel fee | On-time71% |