$99+ 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 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SEA
Jul 8 — Jul 151
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Ontario to Washington with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
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 Ontario to Washington
Cheapest
Best
Last-minute
One-way
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 June 8, 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 June 8, 2026.
This iWofly deal was found by Cheapflights users on 6/6. 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/54:04 pm
ONT
- SEA
Nonstop2h 54m
Frontier
Tue 9/811:53 am
SEA
- ONT
Nonstop2h 46m
Frontier
Deal found 6/6![Frontier logo]()
$175
This Super.com deal was found by Cheapflights users on 6/7. 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.
Wed 8/194:04 pm
ONT
- SEA
Nonstop2h 54m
Frontier
Tue 9/111:53 am
SEA
- ONT
Nonstop2h 46m
Frontier
Deal found 6/7![Frontier logo]()
$176
This Super.com deal was found by Cheapflights users on 6/8. 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.
Sat 8/224:04 pm
ONT
- SEA
Nonstop2h 54m
Frontier
Wed 8/2611:53 am
SEA
- ONT
Nonstop2h 46m
Frontier
Deal found 6/8![Frontier logo]()
$177
This Frontier deal was found by Cheapflights users on 6/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/14:04 pm
ONT
- SEA
Nonstop2h 54m
Frontier
Wed 9/211:53 am
SEA
- ONT
Nonstop2h 46m
Frontier
Deal found 6/6![Frontier logo]()
$178
This Frontier deal was found by Cheapflights users on 6/5. 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.
Wed 9/165:05 pm
ONT
- SEA
Nonstop2h 56m
Frontier
Wed 9/3011:15 am
SEA
- ONT
Nonstop2h 48m
Frontier
Deal found 6/5![Frontier logo]()
$179
This Super.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/264:04 pm
ONT
- SEA
Nonstop2h 54m
Frontier
Sun 8/3011:53 am
SEA
- ONT
Nonstop2h 46m
Frontier
Deal found 6/4![Frontier logo]()
$184
This Super.com deal was found by Cheapflights users on 6/7. 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.
Thu 9/105:05 pm
ONT
- SEA
Nonstop2h 56m
Frontier
Tue 9/1511:15 am
SEA
- ONT
Nonstop2h 48m
Frontier
Deal found 6/7![Frontier logo]()
$185
This Super.com deal was found by Cheapflights users on 6/8. 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.
Sat 8/224:04 pm
ONT
- SEA
Nonstop2h 54m
Frontier
Sun 8/2311:53 am
SEA
- ONT
Nonstop2h 46m
Frontier
Deal found 6/8![Frontier logo]()
$186
This Super.com deal was found by Cheapflights users on 6/8. 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.
Fri 8/144:49 pm
ONT
- SEA
Nonstop2h 49m
Frontier
Wed 8/1911:53 am
SEA
- ONT
Nonstop2h 46m
Frontier
Deal found 6/8![Frontier logo]()
$187
This Frontier deal was found by Cheapflights users on 6/8. 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.
Wed 8/264:04 pm
ONT
- SEA
Nonstop2h 54m
Frontier
Mon 8/3111:53 am
SEA
- ONT
Nonstop2h 46m
Frontier
Deal found 6/8![Frontier logo]()
$188
This Frontier deal was found by Cheapflights users on 6/5. 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.
Wed 9/165:05 pm
ONT
- SEA
Nonstop2h 56m
Frontier
Fri 9/2511:15 am
SEA
- ONT
Nonstop2h 48m
Frontier
Deal found 6/5![Frontier logo]()
$189
This Super.com deal was found by Cheapflights users on 6/7. 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.
Sun 8/24:49 pm
ONT
- SEA
Nonstop2h 49m
Frontier
Sat 8/812:26 pm
SEA
- ONT
Nonstop2h 55m
Frontier
Deal found 6/7![Frontier logo]()
$192
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 June 8, 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 June 8, 2026.
This Southwest deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 7/168:45 pm
ONT
- PDX
1 stop4h 40m
Southwest
Mon 7/205:10 am
PDX
- ONT
1 stop7h 00m
Southwest
Deal found 6/3![Southwest logo]()
$237
This United Airlines deal was found by Cheapflights users on 6/5. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/238:50 am
ONT
- SEA
1 stop7h 24m
United Airlines
Thu 8/271:16 pm
SEA
- ONT
1 stop4h 55m
United Airlines
Deal found 6/5![United Airlines logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 6/7. 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 8/266:05 pm
ONT
- SEA
1 stop4h 34m
Alaska Airlines
Sun 9/133:51 pm
SEA
- ONT
1 stop4h 33m
Alaska Airlines
Deal found 6/7![Alaska Airlines logo]()
$267
This Delta deal was found by Cheapflights users on 6/8. 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 9/2011:44 am
ONT
- SEA
Nonstop2h 56m
Delta
Wed 9/232:30 pm
SEA
- ONT
Nonstop2h 50m
Delta
Deal found 6/8![Delta logo]()
$307
This Southwest deal was found by Cheapflights users on 6/7. 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.
Thu 7/163:40 pm
ONT
- PDX
1 stop3h 55m
Southwest
Sun 7/195:30 am
PDX
- ONT
1 stop6h 50m
Southwest
Deal found 6/7![Southwest logo]()
$247
This Southwest deal was found by Cheapflights users on 6/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/186:30 am
ONT
- PDX
1 stop3h 45m
Southwest
Sun 9/206:25 am
PDX
- ONT
1 stop5h 10m
Southwest
Deal found 6/6![Southwest logo]()
$252
This Alaska Airlines deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 9/86:02 am
ONT
- SEA
Nonstop2h 43m
Alaska Airlines
Tue 9/811:43 am
SEA
- ONT
1 stop4h 27m
Alaska Airlines
Deal found 6/3![Alaska Airlines logo]()
$302
This Delta deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 9/196:00 pm
ONT
- PSC
1 stop5h 54m
Delta
Tue 9/226:00 am
PSC
- ONT
1 stop5h 04m
Delta
Deal found 6/3![Delta logo]()
$309
This Alaska Airlines deal was found by Cheapflights users on 6/5. 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.
Tue 9/110:45 am
ONT
- PSC
1 stop4h 38m
Alaska Airlines
Sat 9/54:00 pm
PSC
- ONT
1 stop4h 24m
Alaska Airlines
Deal found 6/5![Alaska Airlines logo]()
$309
This Delta deal was found by Cheapflights users on 6/5. 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.
Mon 7/65:59 pm
ONT
- PSC
1 stop6h 00m
Delta
Sun 7/125:25 am
PSC
- ONT
1 stop5h 52m
Delta
Deal found 6/5![Delta logo]()
$319
This Southwest deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 8/2712:35 pm
ONT
- SEA
2 stops8h 40m
Southwest
Sun 8/305:55 am
SEA
- ONT
1 stop5h 40m
Southwest
Deal found 6/3![Southwest logo]()
$302
This Alaska Airlines deal was found by Cheapflights users on 6/8. 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 7/810:54 am
ONT
- PSC
1 stop4h 28m
Alaska Airlines
Mon 7/136:04 pm
PSC
- ONT
1 stop5h 07m
Alaska Airlines
Deal found 6/8![Alaska Airlines logo]()
$309
This United Airlines deal was found by Cheapflights users on 6/5. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/196:39 pm
ONT
- PDX
1 stop6h 11m
United Airlines
Sun 6/217:00 am
PDX
- ONT
1 stop5h 12m
United Airlines
Deal found 6/5![United Airlines logo]()
$388
This Delta deal was found by Cheapflights users on 6/7. 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 6/306:20 am
ONT
- SEA
Nonstop2h 57m
Delta
Thu 7/95:30 am
SEA
- ONT
1 stop6h 40m
Delta
Deal found 6/7![Delta logo]()
$337
This Alaska Airlines deal was found by Cheapflights users on 6/6. 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 8/213:09 pm
ONT
- PSC
1 stop7h 39m
Alaska Airlines
Sun 8/235:20 am
PSC
- ONT
1 stop4h 31m
Alaska Airlines
Deal found 6/6![Alaska Airlines logo]()
$309
This Southwest deal was found by Cheapflights users on 6/8. 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 8/148:30 am
ONT
- GEG
2 stops7h 05m
Southwest
Mon 8/245:30 am
GEG
- ONT
1 stop7h 10m
Southwest
Deal found 6/8![Southwest logo]()
$330
This Delta deal was found by Cheapflights users on 6/7. 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.
Thu 8/201:06 pm
ONT
- SEA
1 stop5h 38m
Delta
Sun 8/235:45 am
SEA
- ONT
1 stop6h 31m
Delta
Deal found 6/7![Delta logo]()
$337
This Alaska Airlines deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 9/187:59 pm
ONT
- PSC
1 stop14h 20m
Alaska Airlines
Tue 9/2210:56 am
PSC
- ONT
1 stop8h 07m
Alaska Airlines
Deal found 6/3![Alaska Airlines logo]()
$309
This Delta deal was found by Cheapflights users on 6/8. 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 7/65:21 pm
ONT
- PSC
1 stop6h 37m
Delta
Sun 7/195:21 pm
PSC
- ONT
1 stop6h 27m
Delta
Deal found 6/8![Delta logo]()
$341
This Southwest deal was found by Cheapflights users on 6/6. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/14:55 pm
ONT
- SEA
2 stops8h 20m
Southwest
Sat 8/83:35 pm
SEA
- ONT
1 stop4h 10m
Southwest
Deal found 6/6![Southwest logo]()
$348
This Alaska Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 10/206:54 pm
ONT
- PUW
1 stop5h 02m
Alaska Airlines
Sat 10/2411:27 am
PUW
- ONT
1 stop6h 33m
Alaska Airlines
Deal found 6/4![Alaska Airlines logo]()
$327
This Delta deal was found by Cheapflights users on 6/7. 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 7/225:10 pm
ONT
- SEA
1 stop4h 50m
Delta
Thu 8/67:15 am
SEA
- ONT
1 stop5h 01m
Delta
Deal found 6/7![Delta logo]()
$347
This Southwest deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 7/147:20 pm
ONT
- SEA
1 stop5h 25m
Southwest
Tue 7/217:30 am
SEA
- ONT
2 stops6h 35m
Southwest
Deal found 6/3![Southwest logo]()
$352
This Alaska Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/35:32 pm
ONT
- PDX
Nonstop2h 17m
Alaska Airlines
Tue 7/146:19 am
PDX
- ONT
1 stop6h 50m
Alaska Airlines
Deal found 6/4![Alaska Airlines logo]()
$337
This Southwest deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 6/204:55 pm
ONT
- PDX
2 stops7h 00m
Southwest
Mon 6/2210:40 pm
PDX
- ONT
1 stop8h 50m
Southwest
Deal found 6/3![Southwest logo]()
$354
This Delta deal was found by Cheapflights users on 6/7. 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.
Mon 6/295:59 pm
ONT
- GEG
1 stop5h 56m
Delta
Wed 7/85:25 am
GEG
- ONT
1 stop5h 52m
Delta
Deal found 6/7![Delta logo]()
$361
This Alaska Airlines deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 7/175:32 pm
ONT
- PDX
Nonstop2h 17m
Alaska Airlines
Mon 7/205:30 pm
PDX
- ONT
1 stop5h 41m
Alaska Airlines
Deal found 6/3![Alaska Airlines logo]()
$347
This Southwest deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 7/254:55 pm
ONT
- SEA
2 stops8h 20m
Southwest
Tue 7/287:30 am
SEA
- ONT
2 stops9h 35m
Southwest
Deal found 6/3![Southwest logo]()
$357
This Delta deal was found by Cheapflights users on 6/6. 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 6/291:00 pm
ONT
- GEG
1 stop5h 15m
Delta
Mon 7/69:20 am
GEG
- ONT
1 stop7h 59m
Delta
Deal found 6/6![Delta logo]()
$371
This Alaska Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 6/2410:54 am
ONT
- PSC
1 stop4h 28m
Alaska Airlines
Sun 6/286:04 pm
PSC
- ONT
1 stop17h 10m
Alaska Airlines
Deal found 6/4![Alaska Airlines logo]()
$354
Last-minute flights from Ontario to WashingtonDiscover last-minute flight deals from Ontario to Washington. Data last updated June 8, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Washington. Data last updated June 8, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/226:35 pm
ONT
- PDX
1 stop4h 45m
Southwest
Tue 6/305:10 am
PDX
- ONT
1 stop3h 55m
Southwest
Deal found 6/3![Southwest logo]()
$237
This Super.com deal was found by Cheapflights users on 6/6. 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.
Wed 7/14:03 pm
ONT
- SEA
Nonstop2h 54m
Frontier
Sat 8/111:54 am
SEA
- ONT
Nonstop2h 51m
Frontier
Deal found 6/6![Frontier logo]()
$219
This Travelocity deal was found by Cheapflights users on 6/7. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/76:00 am
ONT
- PDX
1 stop10h 31m
Frontier
Tue 7/145:16 pm
PDX
- ONT
1 stop6h 34m
Frontier
Deal found 6/7![Frontier logo]()
$230
This Southwest deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 7/96:30 pm
ONT
- PDX
1 stop4h 55m
Southwest
Sat 7/189:00 am
PDX
- ONT
1 stop3h 45m
Southwest
Deal found 6/3![Southwest logo]()
$232
This Super.com deal was found by Cheapflights users on 6/6. 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.
Sun 7/264:49 pm
ONT
- SEA
Nonstop2h 49m
Frontier
Fri 7/3111:54 am
SEA
- ONT
Nonstop2h 51m
Frontier
Deal found 6/6![Frontier logo]()
$217
This Super.com deal was found by Cheapflights users on 6/5. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/294:09 pm
ONT
- SEA
Nonstop2h 49m
Frontier
Wed 8/1911:53 am
SEA
- ONT
Nonstop2h 46m
Frontier
Deal found 6/5![Frontier logo]()
$186
This Super.com deal was found by Cheapflights users on 6/7. 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.
Wed 7/294:09 pm
ONT
- SEA
Nonstop2h 49m
Frontier
Fri 7/3111:54 am
SEA
- ONT
Nonstop2h 51m
Frontier
Deal found 6/7![Frontier logo]()
$196
This Booking.com deal was found by Cheapflights users on 6/7. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/293:40 pm
ONT
- SEA
1 stop18h 59m
Frontier
Mon 8/311:54 am
SEA
- ONT
Nonstop2h 51m
Frontier
Deal found 6/7![Frontier logo]()
$216
This Super.com deal was found by Cheapflights users on 6/7. 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.
Thu 7/304:49 pm
ONT
- SEA
Nonstop2h 49m
Frontier
Thu 8/612:26 pm
SEA
- ONT
Nonstop2h 55m
Frontier
Deal found 6/7![Frontier logo]()
$195
This Expedia deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” 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 7/304:49 pm
ONT
- SEA
Nonstop2h 49m
Frontier
Fri 7/3111:54 am
SEA
- ONT
Nonstop2h 51m
Frontier
Deal found 6/4![Frontier logo]()
$198
This Super.com deal was found by Cheapflights users on 6/8. 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.
Fri 7/314:49 pm
ONT
- SEA
Nonstop2h 49m
Frontier
Mon 8/311:54 am
SEA
- ONT
Nonstop2h 51m
Frontier
Deal found 6/8![Frontier logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/314:49 pm
ONT
- SEA
Nonstop2h 49m
Frontier
Tue 8/48:13 pm
SEA
- ONT
1 stop11h 50m
Frontier
Deal found 6/3![Frontier logo]()
$204
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 June 8, 2026.
Search for one-way flight options from Ontario to Washington. Find affordable one-way fares based on user searches. Data last updated June 8, 2026.
This Delta deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 9/236:20 am
ONT
- PDX
1 stop5h 36m
Delta
Deal found 6/3![Delta logo]()
$99
This Delta deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” 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 9/249:45 am
ONT
- PDX
1 stop6h 20m
Delta
Deal found 6/3![Delta logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/144:34 pm
ONT
- SEA
1 stop18h 34m
Frontier
Deal found 6/4![Frontier logo]()
$109
This Kiwi.com deal was found by Cheapflights users on 6/5. 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.
Fri 7/314:49 pm
ONT
- SEA
Nonstop2h 49m
Frontier
Deal found 6/5![Frontier logo]()
$110
This Super.com deal was found by Cheapflights users on 6/6. 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.
Tue 7/710:49 am
ONT
- PDX
1 stop5h 42m
Frontier
Deal found 6/6![Frontier logo]()
$113
This Kiwi.com deal was found by Cheapflights users on 6/7. 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 8/43:40 pm
ONT
- SEA
1 stop19h 28m
Frontier
Deal found 6/7![Frontier logo]()
$113
This Super.com deal was found by Cheapflights users on 6/6. 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.
Tue 9/296:00 am
ONT
- PDX
1 stop8h 27m
Frontier
Deal found 6/6![Frontier logo]()
$114
This Southwest deal was found by Cheapflights users on 6/7. 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.
Tue 8/44:45 pm
ONT
- SEA
1 stop5h 00m
Southwest
Deal found 6/7![Southwest logo]()
$114
This Frontier deal was found by Cheapflights users on 6/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1110:49 am
ONT
- PDX
1 stop5h 42m
Frontier
Deal found 6/6![Frontier logo]()
$115
This Super.com deal was found by Cheapflights users on 6/8. 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.
Wed 9/26:00 am
ONT
- SEA
1 stop8h 04m
Frontier
Deal found 6/8![Frontier logo]()
$115
This Booking.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/810:49 am
ONT
- PDX
1 stop5h 47m
Frontier
Deal found 6/4![Frontier logo]()
$116
This Super.com deal was found by Cheapflights users on 6/7. 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.
Tue 7/216:00 am
ONT
- SEA
1 stop27h 17m
Frontier
Deal found 6/7![Frontier logo]()
$118
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 June 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $175 (iWofly) |
One-way from | $99 (Delta) |
Popular in | June |
Cheapest in | March |
Average price | $287 |
Good round-trip deal | $258 or less |
Good one-way deal | $180 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 June 8, 2026.
Use the filters below to find and compare flights from Ontario to Washington that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioPortland
ONT - PDX
ONTPDX
Ontario
Thu 7/16
8:45 pm-1:25 am
1 stop4h 40m
Portland
Mon 7/20
5:10 am-12:10 pm
1 stop7h 00m
$237
OntarioPortland
ONT - PDX
ONTPDX
Ontario
Thu 7/16
3:40 pm-7:35 pm
1 stop3h 55m
Portland
Sun 7/19
5:30 am-12:20 pm
1 stop6h 50m
$247
OntarioPortland
ONT - PDX
ONTPDX
Ontario
Fri 9/18
6:30 am-10:15 am
1 stop3h 45m
Portland
Sun 9/20
6:25 am-11:35 am
1 stop5h 10m
$252
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Sun 8/23
8:50 am-4:14 pm
1 stop7h 24m
Seattle/Tacoma Intl
Thu 8/27
1:16 pm-6:11 pm
1 stop4h 55m
$257
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Wed 8/26
6:05 pm-10:39 pm
1 stop4h 34m
Seattle/Tacoma Intl
Sun 9/13
3:51 pm-8:24 pm
1 stop4h 33m
$267
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Tue 9/8
6:02 am-8:45 am
Nonstop2h 43m
Seattle/Tacoma Intl
Tue 9/8
11:43 am-4:10 pm
1 stop4h 27m
$302
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Thu 8/27
12:35 pm-9:15 pm
2 stops8h 40m
Seattle/Tacoma Intl
Sun 8/30
5:55 am-11:35 am
1 stop5h 40m
$302
Quickest round-trip
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Sun 9/20
11:44 am-2:40 pm
Nonstop2h 56m
Seattle/Tacoma Intl
Wed 9/23
2:30 pm-5:20 pm
Nonstop2h 50m
$307
OntarioPasco
ONT - PSC
ONTPSC
Ontario
Sat 9/19
6:00 pm-11:54 pm
1 stop5h 54m
Pasco Tri Cities
Tue 9/22
6:00 am-11:04 am
1 stop5h 04m
$309
OntarioPasco
ONT - PSC
ONTPSC
Ontario
Tue 9/1
10:45 am-3:23 pm
1 stop4h 38m
Pasco Tri Cities
Sat 9/5
4:00 pm-8:24 pm
1 stop4h 24m
$309
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-PSC
ONT-PDX
ONT-GEG
ONT-BLI
ONT-SEA
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-PSC
ONT-PDX
ONT-GEG
ONT-BLI
What is the cheapest month to book a flight from Ontario to State of Washington?
Currently, October is the cheapest month in which you can book a flight from Ontario to State of Washington (average of $37). Flying from Ontario to State of Washington in November is currently the most expensive (average of $579). 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 June 8, 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 at noon tend to be the most expensive. A flight in the afternoon could potentially save you up to 14% on airfare.
Weekly flight availability from Ontario to State of Washington
Explore weekly flight availability from Ontario to Washington. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated June 8, 2026.
The most flights from ONT to USWA are scheduled on a Friday (26 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (5 on average).
How much does it cost to fly round-trip from Ontario to State of Washington?
How far ahead should I book a flight from Ontario to State of Washington?
Booking 55 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to State of Washington. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest day to fly from Ontario to State of Washington?
Use this chart to determine the cheapest time to fly round-trip from Ontario to Washington. Price data was last updated on May 30, 2026.
Travelers seeking maximum savings on their Ontario to State of Washington flight should consider departing on Sunday afternoons when fares are most often at their lowest. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Washington
Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated June 8, 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.
Comfort
7.8
Crew
8.5
Overall
7.9
Entertainment
7.0
Food
7.1
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Comfort
7.8
Crew
8.5
Overall
7.9
Entertainment
7.0
Food
7.1
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Comfort
7.8
Crew
8.5
Overall
7.9
Entertainment
7.0
Food
7.1
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Comfort
7.8
Crew
8.5
Overall
7.9
Entertainment
7.0
Food
7.1
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Comfort
7.8
Crew
8.5
Overall
7.9
Entertainment
7.0
Food
7.1
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - SEA
Comfort
7.8
Crew
8.5
Overall
7.9
Entertainment
7.0
Food
7.1
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentAnonymous,Jun 2026
RDU - 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.
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.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Top destinations
Alternative routes for Ontario to Washington
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Washington by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Washington by cabin class
Find flights from Ontario to Washington, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Washington flights
Browse other Ontario and Washington flight options. Last updated on June 8, 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 June 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$89 | Average$208 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$98 | Average$217 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$103 | Average$285 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$139 | Average$396 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$146 | Average$307 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$272 | Average$348 | FlexibilityNo cancel fee | On-time69% |