$76+ Cheap flights from Ontario (ONT) to Washington
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/22. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SEA
Apr 10 — Apr 171
Round-trip
1 adult, Economy
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Cheapest flights from Ontario to WashingtonExplore the most affordable flight options available from Ontario to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 11, 2026.
Explore the most affordable flight options available from Ontario to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 11, 2026.
This Delta deal was found by Cheapflights users on 3/8. 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.
Tue 4/145:05 pm
ONT
- SEA
1 stop6h 54m
Delta
Sat 4/185:35 am
SEA
- ONT
1 stop6h 39m
Delta
Deal found 3/8![Delta logo]()
$119
This Delta deal was found by Cheapflights users on 3/9. 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 4/411:59 am
ONT
- SEA
Nonstop2h 56m
Delta
Tue 4/145:35 am
SEA
- ONT
1 stop6h 39m
Delta
Deal found 3/9![Delta logo]()
$128
This Super.com deal was found by Cheapflights users on 3/9. 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.
Thu 5/212:44 pm
ONT
- SEA
Nonstop2h 52m
Frontier
Mon 5/2511:00 am
SEA
- ONT
Nonstop2h 44m
Frontier
Deal found 3/9![Frontier logo]()
$129
This SmartFares deal was found by Cheapflights users on 3/6. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/247:59 pm
ONT
- SEA
Nonstop2h 51m
Alaska Airlines
Sun 4/267:05 am
SEA
- ONT
Nonstop2h 40m
Alaska Airlines
Deal found 3/6![Alaska Airlines logo]()
$130
This Delta deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/56:00 am
ONT
- SEA
Nonstop2h 55m
Delta
Tue 4/217:50 pm
SEA
- ONT
Nonstop2h 47m
Delta
Deal found 3/11![Delta logo]()
$138
This Delta deal was found by Cheapflights users on 3/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/225:05 pm
ONT
- SEA
1 stop6h 54m
Delta
Tue 4/285:35 am
SEA
- ONT
1 stop6h 39m
Delta
Deal found 3/10![Delta logo]()
$139
This Southwest deal was found by Cheapflights users on 3/9. 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 4/233:00 pm
ONT
- SEA
1 stop5h 05m
Southwest
Mon 4/276:15 pm
SEA
- ONT
1 stop4h 50m
Southwest
Deal found 3/9![Southwest logo]()
$146
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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.
Sat 4/2510:39 am
ONT
- SEA
Nonstop2h 51m
Alaska Airlines
Thu 4/309:17 pm
SEA
- ONT
Nonstop2h 42m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$147
This Delta deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/56:00 am
ONT
- SEA
Nonstop2h 55m
Delta
Sat 4/185:35 am
SEA
- ONT
1 stop6h 39m
Delta
Deal found 3/11![Delta logo]()
$148
This Alaska Airlines deal was found by Cheapflights users on 3/7. 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.
Wed 4/227:00 am
ONT
- PDX
Nonstop2h 24m
Alaska Airlines
Wed 4/299:30 pm
PDX
- ONT
Nonstop2h 18m
Alaska Airlines
Deal found 3/7![Alaska Airlines logo]()
$157
This Expedia deal was found by Cheapflights users on 3/8. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1512:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Thu 4/2311:44 am
GEG
- ONT
1 stop19h 47m
Frontier
Deal found 3/8![Frontier logo]()
$160
This Frontier deal was found by Cheapflights users on 3/9. 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.
Tue 4/2112:59 am
ONT
- PDX
1 stop10h 53m
Frontier
Sat 4/2512:27 pm
PDX
- ONT
1 stop11h 28m
Frontier
Deal found 3/9![Frontier logo]()
$160
Best flights from Ontario to WashingtonDiscover carefully curated flight deals from Ontario to Washington that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 11, 2026.
Discover carefully curated flight deals from Ontario to Washington that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 11, 2026.
This Alaska Airlines deal was found by Cheapflights users on 3/10. 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 5/27:00 am
ONT
- PDX
Nonstop2h 24m
Alaska Airlines
Tue 5/59:30 pm
PDX
- ONT
Nonstop2h 18m
Alaska Airlines
Deal found 3/10![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 3/9. 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 5/911:52 am
ONT
- GEG
1 stop6h 51m
Delta
Wed 5/134:15 pm
GEG
- ONT
1 stop6h 19m
Delta
Deal found 3/9![Delta logo]()
$167
This United Airlines deal was found by Cheapflights users on 3/9. 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.
Tue 4/71:27 pm
ONT
- PDX
1 stop4h 40m
United Airlines
Tue 4/145:30 am
PDX
- ONT
1 stop4h 26m
United Airlines
Deal found 3/9![United Airlines logo]()
$177
This Southwest deal was found by Cheapflights users on 3/9. 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.
Sat 4/255:40 am
ONT
- PDX
1 stop7h 15m
Southwest
Tue 4/286:00 am
PDX
- ONT
1 stop4h 25m
Southwest
Deal found 3/9![Southwest logo]()
$177
This Alaska Airlines deal was found by Cheapflights users on 3/10. 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.
Wed 4/86:00 am
ONT
- SEA
Nonstop2h 54m
Alaska Airlines
Wed 4/159:24 pm
SEA
- ONT
Nonstop2h 35m
Alaska Airlines
Deal found 3/10![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 3/9. 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.
Mon 5/114:57 pm
ONT
- SEA
1 stop5h 06m
Delta
Sat 5/169:45 am
SEA
- ONT
Nonstop2h 50m
Delta
Deal found 3/9![Delta logo]()
$178
This Alaska Airlines deal was found by Cheapflights users on 3/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:00 am
ONT
- SEA
Nonstop2h 54m
Alaska Airlines
Sat 4/189:24 pm
SEA
- ONT
Nonstop2h 35m
Alaska Airlines
Deal found 3/6![Alaska Airlines logo]()
$177
This Delta deal was found by Cheapflights users on 3/8. 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.
Fri 5/155:50 pm
ONT
- SEA
Nonstop3h 00m
Delta
Sat 5/302:30 pm
SEA
- ONT
Nonstop2h 35m
Delta
Deal found 3/8![Delta logo]()
$188
This Southwest deal was found by Cheapflights users on 3/9. 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.
Tue 5/193:30 pm
ONT
- PDX
1 stop5h 00m
Southwest
Mon 5/255:20 am
PDX
- ONT
1 stop6h 40m
Southwest
Deal found 3/9![Southwest logo]()
$208
This Alaska Airlines deal was found by Cheapflights users on 3/8. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/222:59 pm
ONT
- SEA
1 stop4h 54m
Alaska Airlines
Wed 4/297:05 am
SEA
- ONT
Nonstop2h 40m
Alaska Airlines
Deal found 3/8![Alaska Airlines logo]()
$181
This Delta deal was found by Cheapflights users on 3/9. 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 5/1311:52 am
ONT
- SEA
Nonstop3h 03m
Delta
Sun 5/249:45 am
SEA
- ONT
Nonstop2h 50m
Delta
Deal found 3/9![Delta logo]()
$188
This Alaska Airlines deal was found by Cheapflights users on 3/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/247:00 am
ONT
- PDX
Nonstop2h 24m
Alaska Airlines
Tue 4/281:52 pm
PDX
- ONT
1 stop19h 53m
Alaska Airlines
Deal found 3/6![Alaska Airlines logo]()
$191
This United Airlines deal was found by Cheapflights users on 3/10. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1411:05 am
ONT
- PDX
1 stop5h 28m
United Airlines
Fri 4/175:30 am
PDX
- ONT
1 stop4h 26m
United Airlines
Deal found 3/10![United Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 3/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/223:45 pm
ONT
- SEA
2 stops8h 10m
Southwest
Wed 4/292:20 pm
SEA
- ONT
2 stops7h 50m
Southwest
Deal found 3/8![Southwest logo]()
$254
This Alaska Airlines deal was found by Cheapflights users on 3/10. 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.
Thu 5/75:56 pm
ONT
- PDX
Nonstop2h 29m
Alaska Airlines
Mon 5/119:30 pm
PDX
- ONT
Nonstop2h 18m
Alaska Airlines
Deal found 3/10![Alaska Airlines logo]()
$197
This Delta deal was found by Cheapflights users on 3/9. 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 5/131:29 pm
ONT
- GEG
2 stops10h 30m
Delta
Sun 5/177:23 pm
GEG
- ONT
1 stop15h 49m
Delta
Deal found 3/9![Delta logo]()
$231
This United Airlines deal was found by Cheapflights users on 3/9. 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.
Fri 4/241:43 pm
ONT
- SEA
1 stop8h 50m
United Airlines
Tue 4/285:00 am
SEA
- ONT
2 stops13h 02m
United Airlines
Deal found 3/9![United Airlines logo]()
$297
This Southwest deal was found by Cheapflights users on 3/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/179:25 am
ONT
- SEA
2 stops7h 35m
Southwest
Sun 4/195:00 am
SEA
- ONT
1 stop6h 30m
Southwest
Deal found 3/8![Southwest logo]()
$279
This Alaska Airlines deal was found by Cheapflights users on 3/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:00 am
ONT
- PDX
Nonstop2h 28m
Alaska Airlines
Fri 4/248:45 am
PDX
- ONT
1 stop5h 47m
Alaska Airlines
Deal found 3/6![Alaska Airlines logo]()
$217
This Delta deal was found by Cheapflights users on 3/8. 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.
Tue 4/2811:53 am
ONT
- PDX
1 stop6h 59m
Delta
Tue 5/51:32 pm
PDX
- ONT
2 stops10h 12m
Delta
Deal found 3/8![Delta logo]()
$256
This Alaska Airlines deal was found by Cheapflights users on 3/7. 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 5/87:59 pm
ONT
- PSC
1 stop19h 43m
Alaska Airlines
Sun 5/104:19 pm
PSC
- ONT
1 stop17h 26m
Alaska Airlines
Deal found 3/7![Alaska Airlines logo]()
$225
This Southwest deal was found by Cheapflights users on 3/8. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/85:05 pm
ONT
- GEG
2 stops7h 25m
Southwest
Mon 5/115:00 am
GEG
- ONT
1 stop5h 25m
Southwest
Deal found 3/8![Southwest logo]()
$308
This Delta deal was found by Cheapflights users on 3/9. 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 7/287:00 am
ONT
- PSC
1 stop5h 01m
Delta
Tue 8/45:00 pm
PSC
- ONT
1 stop6h 44m
Delta
Deal found 3/9![Delta logo]()
$279
This Alaska Airlines deal was found by Cheapflights users on 3/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/23:26 pm
ONT
- PUW
1 stop8h 33m
Alaska Airlines
Wed 5/63:23 pm
PUW
- ONT
1 stop7h 09m
Alaska Airlines
Deal found 3/6![Alaska Airlines logo]()
$243
This Delta deal was found by Cheapflights users on 3/6. 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.
Sat 6/272:00 pm
ONT
- SEA
Nonstop3h 00m
Delta
Fri 7/35:45 am
SEA
- ONT
1 stop6h 44m
Delta
Deal found 3/6![Delta logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 3/8. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/511:15 am
ONT
- PDX
Nonstop2h 24m
Alaska Airlines
Mon 6/89:31 pm
PDX
- ONT
Nonstop2h 25m
Alaska Airlines
Deal found 3/8![Alaska Airlines logo]()
$257
This Delta deal was found by Cheapflights users on 3/7. 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.
Tue 6/91:00 pm
ONT
- SEA
1 stop5h 29m
Delta
Sat 6/208:25 am
SEA
- ONT
Nonstop2h 49m
Delta
Deal found 3/7![Delta logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 3/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2910:39 am
ONT
- PUW
1 stop8h 12m
Alaska Airlines
Sat 5/27:28 pm
PUW
- ONT
1 stop14h 17m
Alaska Airlines
Deal found 3/6![Alaska Airlines logo]()
$263
This Delta deal was found by Cheapflights users on 3/6. 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.
Thu 6/252:00 pm
ONT
- SEA
Nonstop3h 00m
Delta
Sun 6/285:45 am
SEA
- ONT
1 stop6h 44m
Delta
Deal found 3/6![Delta logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 3/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/63:24 pm
ONT
- ALW
1 stop8h 24m
Alaska Airlines
Sat 5/92:48 pm
ALW
- ONT
1 stop18h 57m
Alaska Airlines
Deal found 3/6![Alaska Airlines logo]()
$263
Last-minute flights from Ontario to WashingtonDiscover last-minute flight deals from Ontario to Washington. Data last updated March 11, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Washington. Data last updated March 11, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 3/9. 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 4/411:59 am
ONT
- SEA
Nonstop2h 56m
Delta
Tue 4/145:35 am
SEA
- ONT
1 stop6h 39m
Delta
Deal found 3/9![Delta logo]()
$128
This Delta deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/56:00 am
ONT
- SEA
Nonstop2h 55m
Delta
Tue 4/217:50 pm
SEA
- ONT
Nonstop2h 47m
Delta
Deal found 3/11![Delta logo]()
$138
This Delta deal was found by Cheapflights users on 3/11. Clicking the “Pick Dates” 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 4/56:00 am
ONT
- SEA
Nonstop2h 55m
Delta
Sat 4/185:35 am
SEA
- ONT
1 stop6h 39m
Delta
Deal found 3/11![Delta logo]()
$148
This Delta deal was found by Cheapflights users on 3/8. 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.
Tue 4/145:05 pm
ONT
- SEA
1 stop6h 54m
Delta
Sat 4/185:35 am
SEA
- ONT
1 stop6h 39m
Delta
Deal found 3/8![Delta logo]()
$119
This Delta deal was found by Cheapflights users on 3/6. 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 4/152:20 pm
ONT
- SEA
Nonstop3h 04m
Delta
Fri 4/174:36 pm
SEA
- ONT
1 stop7h 08m
Delta
Deal found 3/6![Delta logo]()
$149
This Delta deal was found by Cheapflights users on 3/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/225:05 pm
ONT
- SEA
1 stop6h 54m
Delta
Tue 4/285:35 am
SEA
- ONT
1 stop6h 39m
Delta
Deal found 3/10![Delta logo]()
$139
This Delta deal was found by Cheapflights users on 3/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/235:05 pm
ONT
- SEA
1 stop6h 54m
Delta
Thu 4/3010:54 am
SEA
- ONT
Nonstop2h 45m
Delta
Deal found 3/10![Delta logo]()
$129
This Southwest deal was found by Cheapflights users on 3/9. 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 4/233:00 pm
ONT
- SEA
1 stop5h 05m
Southwest
Mon 4/276:15 pm
SEA
- ONT
1 stop4h 50m
Southwest
Deal found 3/9![Southwest logo]()
$146
This SmartFares deal was found by Cheapflights users on 3/6. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/247:59 pm
ONT
- SEA
Nonstop2h 51m
Alaska Airlines
Sun 4/267:05 am
SEA
- ONT
Nonstop2h 40m
Alaska Airlines
Deal found 3/6![Alaska Airlines logo]()
$130
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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 4/247:59 pm
ONT
- SEA
Nonstop2h 51m
Alaska Airlines
Wed 4/297:05 am
SEA
- ONT
Nonstop2h 40m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$137
This Alaska Airlines deal was found by Cheapflights users on 3/9. 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.
Sat 4/2510:39 am
ONT
- SEA
Nonstop2h 51m
Alaska Airlines
Thu 4/309:17 pm
SEA
- ONT
Nonstop2h 42m
Alaska Airlines
Deal found 3/9![Alaska Airlines logo]()
$147
This Trip.com deal was found by Cheapflights users on 3/7. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/307:59 pm
ONT
- SEA
Nonstop2h 51m
Alaska Airlines
Sun 5/37:05 am
SEA
- ONT
Nonstop2h 40m
Alaska Airlines
Deal found 3/7![Alaska Airlines logo]()
$150
One-way flights from Ontario to WashingtonSearch for one-way flight options from Ontario to Washington. Find affordable one-way fares based on user searches. Data last updated March 11, 2026.
Search for one-way flight options from Ontario to Washington. Find affordable one-way fares based on user searches. Data last updated March 11, 2026.
This Delta deal was found by Cheapflights users on 3/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/225:55 pm
ONT
- PDX
1 stop6h 01m
Delta
Deal found 3/10![Delta logo]()
$76
This Kiwi.com deal was found by Cheapflights users on 3/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2112:59 am
ONT
- PDX
1 stop10h 53m
Frontier
Deal found 3/7![Frontier logo]()
$78
This Super.com deal was found by Cheapflights users on 3/6. 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 4/1611:47 am
ONT
- PDX
1 stop21h 12m
Frontier
Deal found 3/6![Frontier logo]()
$85
This Frontier deal was found by Cheapflights users on 3/9. 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.
Wed 4/1512:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Deal found 3/9![Frontier logo]()
$86
This Frontier deal was found by Cheapflights users on 3/9. 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.
Mon 4/2012:59 am
ONT
- PDX
1 stop10h 53m
Frontier
Deal found 3/9![Frontier logo]()
$86
This Trip.com deal was found by Cheapflights users on 3/6. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/115:33 pm
ONT
- PDX
1 stop19h 29m
Frontier
Deal found 3/6![Frontier logo]()
$88
This Trip.com deal was found by Cheapflights users on 3/7. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/2711:28 am
ONT
- GEG
1 stop23h 07m
Frontier
Deal found 3/7![Frontier logo]()
$89
This Alaska Airlines deal was found by Cheapflights users on 3/8. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/193:35 pm
ONT
- PDX
1 stop5h 10m
Alaska Airlines
Deal found 3/8![Alaska Airlines logo]()
$89
This CheapOair deal was found by Cheapflights users on 3/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/154:22 pm
ONT
- SEA
1 stop4h 36m
Alaska Airlines
Deal found 3/10![Alaska Airlines logo]()
$89
This Trip.com deal was found by Cheapflights users on 3/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/2512:59 am
ONT
- GEG
1 stop9h 50m
Frontier
Deal found 3/10![Frontier logo]()
$90
This Frontier deal was found by Cheapflights users on 3/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/44:08 pm
ONT
- PDX
1 stop5h 01m
Frontier
Deal found 3/10![Frontier logo]()
$90
This Delta deal was found by Cheapflights users on 3/9. 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 4/85:09 pm
ONT
- SEA
1 stop6h 54m
Delta
Deal found 3/9![Delta logo]()
$90
Find flight deals from Ontario to Washington
Keep the following information in mind while searching for Ontario to Washington flight deals. Data was last updated March 11, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $119 (Delta) |
One-way from | $76 (Delta) |
Popular in | June |
Cheapest in | March |
Average price | $180 |
Good round-trip deal | $214 or less |
Good one-way deal | $174 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Washington that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 11, 2026.
Use the filters below to find and compare flights from Ontario to Washington that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
OntarioPortland
ONT - PDX
ONTPDX
Ontario
Sat 5/2
7:00 am-9:24 am
Nonstop2h 24m
Portland
Tue 5/5
9:30 pm-11:48 pm
Nonstop2h 18m
$157
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Wed 4/8
6:00 am-8:54 am
Nonstop2h 54m
Seattle/Tacoma Intl
Wed 4/15
9:24 pm-11:59 pm
Nonstop2h 35m
$157
OntarioSpokane
ONT - GEG
ONTGEG
Ontario
Sat 5/9
11:52 am-6:43 pm
1 stop6h 51m
Spokane
Wed 5/13
4:15 pm-10:34 pm
1 stop6h 19m
$167
OntarioPortland
ONT - PDX
ONTPDX
Ontario
Tue 4/7
1:27 pm-6:07 pm
1 stop4h 40m
Portland
Tue 4/14
5:30 am-9:56 am
1 stop4h 26m
$177
OntarioPortland
ONT - PDX
ONTPDX
Ontario
Sat 4/25
5:40 am-12:55 pm
1 stop7h 15m
Portland
Tue 4/28
6:00 am-10:25 am
1 stop4h 25m
$177
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Wed 4/15
6:00 am-8:54 am
Nonstop2h 54m
Seattle/Tacoma Intl
Sat 4/18
9:24 pm-11:59 pm
Nonstop2h 35m
$177
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Mon 5/11
4:57 pm-10:03 pm
1 stop5h 06m
Seattle/Tacoma Intl
Sat 5/16
9:45 am-12:35 pm
Nonstop2h 50m
$178
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Wed 4/22
2:59 pm-7:53 pm
1 stop4h 54m
Seattle/Tacoma Intl
Wed 4/29
7:05 am-9:45 am
Nonstop2h 40m
$181
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Fri 5/15
5:50 pm-8:50 pm
Nonstop3h 00m
Seattle/Tacoma Intl
Sat 5/30
2:30 pm-5:05 pm
Nonstop2h 35m
$188
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Wed 5/13
11:52 am-2:55 pm
Nonstop3h 03m
Seattle/Tacoma Intl
Sun 5/24
9:45 am-12:35 pm
Nonstop2h 50m
$188
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Ontario to Washington
Have a flexible travel schedule? Discover the best time to fly to Washington from Ontario with our price prediction graph.
ONT-PDX
ONT-GEG
ONT-SEA
ONT-PSC
ONT-PUW
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Ontario to Washington
ONT-USWA
ONT-PDX
ONT-GEG
ONT-SEA
ONT-PSC
What is the cheapest month to book a flight from Ontario to State of Washington?
Currently, June is the cheapest month in which you can book a flight from Ontario to State of Washington (average of $39). Flying from Ontario to State of Washington in November is currently the most expensive (average of $94). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from ONT to WA?
Find hourly flight availability from Ontario to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 11, 2026.
One of the essential ways to save on airfare from Ontario to State of Washington is to remain as flexible as possible. Flights that are in the evening tend to be the most expensive. A flight in the morning could potentially save you up to 9% on airfare.
What is the cheapest day to fly from Ontario to State of Washington?
Use this chart to determine the cheapest time to fly round-trip from Ontario to Washington. Price data was last updated on February 21, 2026.
Travelers seeking maximum savings on their Ontario to State of Washington flight should consider departing on Saturday evenings when fares are most often at their lowest. Sunday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Ontario to State of Washington
Explore weekly flight availability from Ontario to Washington. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated March 11, 2026.
The most flights from ONT to USWA are scheduled on a Wednesday (17 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (6 on average).
Reviews of airlines servicing Washington
Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated March 11, 2026.
Get a feel of what it's like to fly with Alaska Airlines,Southwest, andDelta from Ontario to Washington by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Comfort
7.8
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Comfort
7.8
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Comfort
7.8
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Comfort
7.8
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Comfort
7.8
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Crew
8.5
Entertainment
7.0
Food
7.1
Boarding
8.1
Comfort
7.8
Overall
8.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Dec 2025
SJC - SEA
Related info for your journey
Find useful and relevant information for your journey from Ontario to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Ontario to Washington
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Complete your trip
Complete your trip to Washington by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Washington by cabin class
Find flights from Ontario to Washington, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Washington flights
Browse other Ontario and Washington flight options. Last updated on March 11, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to Washington flights
Consider these flights traveling from Ontario to Washington.
Top 6 airlines flying from Ontario to Washington
Discover the top 6 airlines that operate flights from Ontario to Washington. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$83 | Average$185 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$88 | Average$285 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$99 | Average$265 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$139 | Average$390 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$150 | Average$292 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$258 | Average$358 | FlexibilityNo cancel fee | On-time69% |