$56+ 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 11/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — ONT
Oct 10 — Oct 171
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 September 10, 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 September 10, 2026.
This Booking.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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.
Fri 10/29:45 pm -
1 stop11h 24m
Sat 10/35:34 pm -
Nonstop2h 56m
Deal found 9/9![Frontier logo]()
$131
This Super.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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.
Fri 10/29:45 pm -
1 stop11h 24m
Mon 10/55:44 pm -
Nonstop2h 56m
Deal found 9/9![Frontier logo]()
$133
This Frontier deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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 10/2910:50 am -
Nonstop2h 48m
Fri 10/305:06 pm -
Nonstop3h 02m
Deal found 9/9![Frontier logo]()
$134
This Priceline deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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.
Fri 10/1610:53 am -
Nonstop2h 50m
Sun 10/185:15 pm -
Nonstop2h 56m
Deal found 9/9![Frontier logo]()
$135
This Expedia deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates ” 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 10/810:03 am -
Nonstop2h 50m
Thu 10/158:35 pm -
1 stop13h 13m
Deal found 9/10![Frontier logo]()
$136
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” 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 10/910:53 am -
Nonstop2h 50m
Sun 10/115:15 pm -
Nonstop2h 56m
Deal found 9/8![Frontier logo]()
$138
This Flightnetwork deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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.
Sat 10/34:27 pm -
1 stop7h 20m
Tue 10/66:15 am -
1 stop8h 53m
Deal found 9/9![Frontier logo]()
$140
This Trip.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/310:53 am -
Nonstop2h 52m
Mon 10/52:30 pm -
1 stop19h 12m
Deal found 9/9![Frontier logo]()
$141
This Frontier deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” 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 10/1110:03 am -
Nonstop2h 50m
Sun 10/255:15 pm -
Nonstop2h 56m
Deal found 9/5![Frontier logo]()
$143
This FlightHub deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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 10/2712:02 pm -
1 stop11h 49m
Sat 10/3111:52 am -
1 stop24h 20m
Deal found 9/9![Frontier logo]()
$241
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” 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 11/1712:02 pm -
1 stop11h 49m
Fri 11/208:02 am -
1 stop5h 01m
Deal found 9/8![Frontier logo]()
$245
This Kiwi.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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 10/1912:25 pm -
1 stop4h 05m
Wed 10/2810:35 am -
1 stop25h 01m
Deal found 9/9![Frontier logo]()
$248
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 September 10, 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 September 10, 2026.
This Alaska Airlines deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” 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 10/2410:31 am -
Nonstop2h 45m
Mon 10/2611:13 am -
Nonstop2h 43m
Deal found 9/5![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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 11/77:56 pm -
Nonstop2h 47m
Wed 11/117:00 am -
Nonstop3h 01m
Deal found 9/9![Delta logo]()
$157
This Southwest deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” 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 10/1711:40 am -
1 stop6h 45m
Mon 10/195:15 pm -
1 stop7h 45m
Deal found 9/7![Southwest logo]()
$177
This United Airlines deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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 11/47:00 am -
1 stop5h 29m
Sun 11/89:25 am -
1 stop5h 14m
Deal found 9/9![United Airlines logo]()
$237
This Alaska Airlines deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” 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 10/117:30 am -
Nonstop2h 47m
Tue 10/276:02 am -
Nonstop2h 47m
Deal found 9/5![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” 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 11/238:11 pm -
Nonstop2h 49m
Fri 11/276:00 am -
1 stop6h 40m
Deal found 9/6![Delta logo]()
$167
This Alaska Airlines deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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 10/217:30 am -
Nonstop2h 47m
Sun 10/256:02 am -
Nonstop2h 47m
Deal found 9/9![Alaska Airlines logo]()
$157
This Southwest deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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 10/295:30 am -
1 stop5h 45m
Sat 10/319:30 am -
2 stops8h 20m
Deal found 9/9![Southwest logo]()
$182
This Delta deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” 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 10/107:56 pm -
Nonstop2h 47m
Sat 10/171:35 pm -
1 stop5h 27m
Deal found 9/7![Delta logo]()
$167
This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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 11/179:25 am -
1 stop6h 59m
Thu 11/266:00 am -
1 stop6h 40m
Deal found 9/9![Delta logo]()
$177
This Alaska Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” 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 10/177:30 am -
Nonstop2h 47m
Sat 10/172:13 pm -
Nonstop2h 43m
Deal found 9/7![Alaska Airlines logo]()
$212
This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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 11/188:25 am -
Nonstop2h 52m
Sun 11/227:00 am -
Nonstop3h 01m
Deal found 9/9![Delta logo]()
$217
This Alaska Airlines deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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 10/205:48 pm -
Nonstop2h 27m
Tue 10/2711:29 am -
Nonstop2h 21m
Deal found 9/9![Alaska Airlines logo]()
$260
This Southwest deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” 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 9/254:35 pm -
1 stop5h 40m
Sat 9/2610:15 am -
2 stops7h 30m
Deal found 9/7![Southwest logo]()
$322
This Alaska Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” 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 10/301:55 pm -
1 stop9h 47m
Tue 11/34:09 pm -
1 stop18h 16m
Deal found 9/7![Alaska Airlines logo]()
$263
This Delta deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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 10/238:44 pm -
1 stop25h 59m
Fri 10/306:20 am -
1 stop15h 36m
Deal found 9/9![Delta logo]()
$263
This Southwest deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” 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 9/255:35 am -
1 stop6h 35m
Tue 9/299:40 am -
2 stops5h 45m
Deal found 9/5![Southwest logo]()
$323
This Alaska Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” 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 10/246:00 pm -
1 stop16h 17m
Mon 10/266:56 pm -
1 stop15h 14m
Deal found 9/10![Alaska Airlines logo]()
$263
This Delta deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” 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 10/145:10 am -
1 stop6h 06m
Sat 10/176:20 am -
1 stop5h 58m
Deal found 9/5![Delta logo]()
$263
This Alaska Airlines deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” 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 10/18:31 am -
1 stop14h 53m
Tue 10/66:02 am -
1 stop5h 37m
Deal found 9/7![Alaska Airlines logo]()
$263
This Delta deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” 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 11/115:00 am -
1 stop6h 17m
Sat 11/146:00 am -
2 stops11h 01m
Deal found 9/7![Delta logo]()
$268
This Alaska Airlines deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” 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 10/237:46 pm -
1 stop14h 31m
Sun 11/86:00 am -
1 stop8h 22m
Deal found 9/5![Alaska Airlines logo]()
$263
This Delta deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” 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 11/115:50 pm -
1 stop5h 10m
Thu 11/1211:57 am -
1 stop5h 13m
Deal found 9/8![Delta logo]()
$288
This Alaska Airlines deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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 10/144:01 pm -
1 stop4h 14m
Mon 10/196:56 pm -
1 stop15h 14m
Deal found 9/9![Alaska Airlines logo]()
$292
This Delta deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” 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 11/155:50 pm -
1 stop5h 10m
Tue 11/175:59 pm -
1 stop5h 37m
Deal found 9/8![Delta logo]()
$298
This Delta deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” 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 12/95:30 am -
1 stop5h 47m
Mon 12/145:04 pm -
1 stop6h 57m
Deal found 9/6![Delta logo]()
$298
This Alaska Airlines deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” 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 10/124:41 pm -
1 stop7h 01m
Sat 10/176:02 am -
1 stop17h 53m
Deal found 9/5![Alaska Airlines logo]()
$301
This Delta deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” 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 9/285:49 pm -
1 stop4h 51m
Sat 10/106:00 pm -
1 stop4h 42m
Deal found 9/8![Delta logo]()
$302
This Alaska Airlines deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” 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 10/236:00 pm -
1 stop19h 16m
Mon 10/2611:13 am -
1 stop22h 57m
Deal found 9/10![Alaska Airlines logo]()
$303
This Alaska Airlines deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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 12/47:19 pm -
2 stops21h 56m
Mon 12/76:00 am -
1 stop27h 05m
Deal found 9/9![Alaska Airlines logo]()
$308
Last-minute flights from Washington to OntarioDiscover last-minute flight deals from Washington to Ontario. Data last updated September 10, 2026 and is based on user searches.
Discover last-minute flight deals from Washington to Ontario. Data last updated September 10, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” 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.
Sun 9/2012:38 pm -
1 stop11h 09m
Wed 9/2310:04 am -
1 stop25h 32m
Deal found 9/5![Frontier logo]()
$251
This Booking.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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.
Fri 10/29:45 pm -
1 stop11h 24m
Sat 10/35:34 pm -
Nonstop2h 56m
Deal found 9/9![Frontier logo]()
$131
This Super.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” 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.
Fri 10/27:45 pm -
1 stop13h 24m
Mon 10/55:44 pm -
Nonstop2h 56m
Deal found 9/10![Frontier logo]()
$133
This Flightnetwork deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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.
Sat 10/34:27 pm -
1 stop7h 20m
Tue 10/66:15 am -
1 stop8h 53m
Deal found 9/9![Frontier logo]()
$140
This Trip.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/310:53 am -
Nonstop2h 52m
Tue 10/611:13 am -
Nonstop2h 43m
Deal found 9/9![Multiple Airlines logo]()
$141
This Kiwi.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” 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.
Sat 10/34:27 pm -
1 stop7h 20m
Mon 10/58:24 pm -
1 stop13h 18m
Deal found 9/10![Frontier logo]()
$142
This Expedia deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” 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 10/810:03 am -
Nonstop2h 50m
Thu 10/158:35 pm -
1 stop13h 13m
Deal found 9/10![Frontier logo]()
$136
This Frontier deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” 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 10/910:53 am -
Nonstop2h 50m
Sun 10/115:15 pm -
Nonstop2h 56m
Deal found 9/8![Frontier logo]()
$138
This Frontier deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” 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 10/1110:03 am -
Nonstop2h 50m
Sun 10/255:15 pm -
Nonstop2h 56m
Deal found 9/5![Frontier logo]()
$143
This Priceline deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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.
Fri 10/1610:53 am -
Nonstop2h 50m
Sun 10/185:15 pm -
Nonstop2h 56m
Deal found 9/9![Frontier logo]()
$135
This flugladen.de deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure flugladen.de is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/2412:42 pm -
1 stop5h 18m
Mon 10/266:56 pm -
1 stop4h 59m
Deal found 9/9![Alaska Airlines logo]()
$254
This Frontier deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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 10/2910:50 am -
Nonstop2h 48m
Fri 10/305:06 pm -
Nonstop3h 02m
Deal found 9/9![Frontier logo]()
$134
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 September 10, 2026.
Search for one-way flight options from Washington to Ontario. Find affordable one-way fares based on user searches. Data last updated September 10, 2026.
This Super.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” 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.
Mon 11/910:50 am -
Nonstop2h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Frontier logo]()
$56
This Kiwi.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” 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.
Sat 11/74:27 pm -
1 stop7h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/10![Frontier logo]()
$62
This Super.com deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” 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 10/110:53 am -
Nonstop2h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Frontier logo]()
$63
This Booking.com deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” 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.
Sat 10/310:53 am -
Nonstop2h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/9![Frontier logo]()
$65
This Kiwi.com deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” 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.
Sat 12/56:49 pm -
Nonstop2h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Frontier logo]()
$66
This Kiwi.com deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” 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 12/76:49 pm -
Nonstop2h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Frontier logo]()
$67
This Kiwi.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” 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 11/810:50 am -
Nonstop2h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Frontier logo]()
$69
This FlightHub deal was found by Cheapflights users on 9/5. Clicking the “Pick Dates” 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.
Sun 11/2210:18 am -
Nonstop2h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Frontier logo]()
$72
This Super.com deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” 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.
Fri 11/2710:18 am -
Nonstop2h 48m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Frontier logo]()
$73
This Kiwi.com deal was found by Cheapflights users on 9/6. Clicking the “Pick Dates” 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 10/410:53 am -
Nonstop2h 52m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/6![Frontier logo]()
$74
This Super.com deal was found by Cheapflights users on 9/7. Clicking the “Pick Dates” 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.
Mon 9/2812:39 pm -
1 stop4h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/7![Frontier logo]()
$110
This Super.com deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” 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.
Mon 10/512:39 pm -
1 stop4h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/8![Frontier logo]()
$113
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 September 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $131 (Booking.com) |
One-way from | $56 (Super.com) |
Popular in | July |
Cheapest in | March |
Average price | $268 |
Good round-trip deal | $179 or less |
Good one-way deal | $93 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 September 10, 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
SeattleOntario
SEA Seattle/Tacoma Intl - ONT Ontario
SEAONT
Seattle/Tacoma Intl
Tue 10/20
12:05 pm-4:50 pm
1 stop4h 45m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$89
SeattleOntario
SEA Seattle/Tacoma Intl - ONT Ontario
SEAONT
Seattle/Tacoma Intl
Sat 10/3
9:45 am-5:55 pm
1 stop8h 10m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$94
SeattleOntario
SEA Seattle/Tacoma Intl - ONT Ontario
SEAONT
Seattle/Tacoma Intl
Thu 12/10
7:55 pm-10:39 pm
Nonstop2h 44m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$109
BellinghamOntario
BLI Bellingham - ONT Ontario
BLIONT
Bellingham
Sun 9/27
4:59 pm-11:22 am
1 stop18h 23m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$117
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Wed 11/4
6:08 am-11:18 am
1 stop5h 10m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$139
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Sat 10/10
9:55 am-4:23 pm
1 stop6h 28m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$144
PortlandOntario
PDX Portland - ONT Ontario
PDXONT
Portland
Thu 10/8
5:50 am-11:15 am
1 stop5h 25m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$145
SeattleOntario
SEA Seattle/Tacoma Intl - ONT Ontario
SEAONT
Seattle/Tacoma Intl
Sun 3/7
8:27 am-11:09 am
Nonstop2h 42m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$149
SeattleOntario
SEA Seattle/Tacoma Intl - ONT Ontario
SEAONT
Seattle/Tacoma Intl
Tue 3/9
8:27 am-11:09 am
Nonstop2h 42m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$154
SeattleOntario
SEA Seattle/Tacoma Intl - ONT Ontario
SEAONT
Seattle/Tacoma Intl
Sat 10/24
10:31 am-1:16 pm
Nonstop2h 45m
Ontario
Mon 10/26
11:13 am-1:56 pm
Nonstop2h 43m
$157
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.
SEA-ONT
BLI-ONT
PDX-ONT
PSC-ONT
GEG-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
SEA-ONT
BLI-ONT
PDX-ONT
PSC-ONT
What is the cheapest month to book a flight from State of Washington to Ontario?
Currently, October is the cheapest month in which you can book a flight from State of Washington to Ontario (average of $231). Flying from State of Washington to Ontario in February is currently the most expensive (average of $375). 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 September 10, 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 19% 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 September 10, 2026.
The most flights from USWA to ONT are scheduled on a Tuesday (20 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (11 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 $179 and $356 in October.The cheapest round-trip price found within the last 5 days was $131 on Frontier (Oct 2-Oct 3).
How far ahead should I book a flight from State of Washington to Ontario?
Booking 59 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 September 5, 2026.
Travelers seeking maximum savings on their State of Washington to Ontario flight should consider departing on Monday at noon when fares are most often at their lowest. Monday afternoons 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 September 10, 2026.
Washington and Ontario flights
Browse other Washington and Ontario flight options. Last updated on September 10, 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 September 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$73 | Average$226 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$98 | Average$387 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$108 | Average$334 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$130 | Average$340 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$139 | Average$374 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$167 | Average$378 | FlexibilityNo cancel fee | On-time69% |