$33+ Cheap flights from Ontario (ONT) to the United States
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 11/17. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Oct 8 — Oct 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 USA 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 USA
Cheapest
Best
Last-minute
One-way
Cheapest flights from Ontario to USAExplore the most affordable flight options available from Ontario to USA. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 8, 2026.
Explore the most affordable flight options available from Ontario to USA. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 8, 2026.
This Booking.com deal was found by Cheapflights users on 9/4. 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.
Fri 10/2312:01 pm -
Nonstop1h 31m
Fri 10/236:02 pm -
Nonstop1h 38m
Deal found 9/4![Frontier logo]()
$60
This Super.com deal was found by Cheapflights users on 9/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:07 pm -
Nonstop1h 36m
Mon 9/286:02 pm -
Nonstop1h 34m
Deal found 9/3![Frontier logo]()
$64
This Super.com deal was found by Cheapflights users on 9/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/112:07 pm -
Nonstop1h 36m
Thu 10/86:02 pm -
Nonstop1h 38m
Deal found 9/3![Frontier logo]()
$65
This Trip.com deal was found by Cheapflights users on 9/3. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1612:01 pm -
Nonstop1h 31m
Sun 10/256:02 pm -
Nonstop1h 38m
Deal found 9/3![Frontier logo]()
$69
This Booking.com deal was found by Cheapflights users on 9/3. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:07 pm -
Nonstop1h 36m
Thu 9/246:02 pm -
Nonstop1h 34m
Deal found 9/3![Frontier logo]()
$70
This Booking.com deal was found by Cheapflights users on 9/3. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:07 pm -
Nonstop1h 36m
Fri 9/256:02 pm -
Nonstop1h 34m
Deal found 9/3![Frontier logo]()
$71
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 10/2512:01 pm -
Nonstop1h 31m
Sun 10/256:02 pm -
Nonstop1h 38m
Deal found 9/6![Frontier logo]()
$73
This Frontier deal was found by Cheapflights users on 9/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2312:01 pm -
Nonstop1h 31m
Sun 10/256:02 pm -
Nonstop1h 38m
Deal found 9/3![Frontier logo]()
$75
This Frontier deal was found by Cheapflights users on 9/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1512:01 pm -
Nonstop1h 31m
Thu 10/226:02 pm -
Nonstop1h 38m
Deal found 9/3![Frontier logo]()
$82
This Booking.com deal was found by Cheapflights users on 9/3. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1710:04 am -
1 stop4h 21m
Mon 10/196:02 pm -
Nonstop1h 38m
Deal found 9/3![Frontier logo]()
$83
This Super.com deal was found by Cheapflights users on 9/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/2512:07 pm -
Nonstop1h 36m
Mon 9/286:02 pm -
Nonstop1h 34m
Deal found 9/3![Frontier logo]()
$84
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 11/711:52 am -
Nonstop2h 21m
Mon 11/910:29 pm -
Nonstop2h 22m
Deal found 9/5![Frontier logo]()
$94
Best flights from Ontario to USADiscover carefully curated flight deals from Ontario to USA that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 8, 2026.
Discover carefully curated flight deals from Ontario to USA that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 8, 2026.
This Delta deal was found by Cheapflights users on 9/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/166:00 pm -
Nonstop2h 59m
Sat 10/177:15 am -
1 stop5h 21m
Deal found 9/4![Delta logo]()
$167
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/163:55 pm -
1 stop6h 50m
Tue 10/2012:45 pm -
1 stop6h 55m
Deal found 9/6![Southwest logo]()
$177
This United Airlines deal was found by Cheapflights users on 9/3. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/301:52 pm -
Nonstop1h 29m
Wed 10/78:40 am -
Nonstop1h 43m
Deal found 9/3![United Airlines logo]()
$187
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 10/3011:13 am -
Nonstop2h 43m
Sat 10/3110:58 am -
1 stop6h 07m
Deal found 9/7![Alaska Airlines logo]()
$197
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 9/218:24 pm -
2 stops10h 51m
Thu 9/2410:40 am -
1 stop8h 59m
Deal found 9/2![Frontier logo]()
$320
This United Airlines deal was found by Cheapflights users on 9/3. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:07 am -
Nonstop1h 26m
Sat 10/104:15 pm -
Nonstop1h 31m
Deal found 9/3![United Airlines logo]()
$187
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.
Tue 10/272:13 pm -
Nonstop2h 43m
Sat 10/3110:58 am -
1 stop6h 07m
Deal found 9/5![Alaska Airlines logo]()
$197
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.
Mon 9/284:00 pm -
1 stop4h 20m
Mon 10/58:10 pm -
1 stop3h 40m
Deal found 9/7![Southwest logo]()
$199
This United Airlines deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/221:52 pm -
Nonstop1h 29m
Sat 10/249:25 pm -
Nonstop1h 26m
Deal found 9/2![United Airlines logo]()
$187
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/167:30 am -
Nonstop6h 06m
Wed 11/1810:25 pm -
1 stop10h 53m
Deal found 9/6![Multiple Airlines logo]()
$434
This United Airlines deal was found by Cheapflights users on 9/3. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/511:20 am -
Nonstop1h 33m
Wed 1/67:01 pm -
Nonstop1h 25m
Deal found 9/3![United Airlines logo]()
$188
This Southwest deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 10/164:15 pm -
1 stop3h 45m
Mon 10/197:55 pm -
1 stop5h 00m
Deal found 9/2![Southwest logo]()
$211
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.
Sun 11/86:00 am -
Nonstop2h 51m
Fri 11/138:31 pm -
Nonstop2h 35m
Deal found 9/7![Alaska Airlines logo]()
$217
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 11/187:00 am -
Nonstop3h 01m
Wed 11/252:33 pm -
Nonstop2h 46m
Deal found 9/7![Delta logo]()
$267
This United Airlines deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 10/165:00 am -
Nonstop2h 21m
Mon 10/197:35 pm -
Nonstop2h 23m
Deal found 9/2![United Airlines logo]()
$212
This Delta deal was found by Cheapflights users on 9/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/216:00 am -
1 stop6h 40m
Tue 12/18:25 am -
Nonstop2h 52m
Deal found 9/4![Delta logo]()
$277
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/126:02 am -
Nonstop2h 47m
Sun 10/187:30 am -
Nonstop2h 47m
Deal found 9/6![Alaska Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 9/3. 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.
Sun 11/15:00 am -
2 stops6h 25m
Tue 11/312:00 pm -
2 stops8h 35m
Deal found 9/3![Southwest logo]()
$265
This United Airlines deal was found by Cheapflights users on 9/3. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/49:25 am -
Nonstop1h 29m
Wed 10/79:25 pm -
Nonstop1h 26m
Deal found 9/3![United Airlines logo]()
$228
This Delta deal was found by Cheapflights users on 9/3. 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 10/291:35 pm -
1 stop6h 30m
Fri 11/62:03 pm -
2 stops10h 40m
Deal found 9/3![Delta logo]()
$279
This Southwest deal was found by Cheapflights users on 9/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/26:55 pm -
1 stop3h 50m
Fri 10/94:55 pm -
2 stops5h 15m
Deal found 9/4![Southwest logo]()
$269
This Alaska Airlines 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/1110:03 am -
2 stops12h 06m
Sat 1/2312:53 pm -
1 stop9h 48m
Deal found 9/6![Alaska Airlines logo]()
$288
This Delta deal was found by Cheapflights users on 9/3. 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.
Mon 11/911:10 pm -
1 stop7h 27m
Thu 11/126:00 am -
1 stop8h 08m
Deal found 9/3![Delta logo]()
$307
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.
Mon 10/196:55 pm -
1 stop5h 45m
Wed 10/215:20 am -
2 stops10h 20m
Deal found 9/5![Southwest logo]()
$280
This United Airlines deal was found by Cheapflights users on 9/4. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/186:00 am -
1 stop6h 20m
Thu 12/33:30 pm -
1 stop4h 59m
Deal found 9/4![United Airlines logo]()
$257
This Delta deal was found by Cheapflights users on 9/3. 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 11/712:16 pm -
1 stop7h 17m
Tue 11/106:40 am -
1 stop8h 37m
Deal found 9/3![Delta logo]()
$307
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 9/279:31 am -
Nonstop5h 59m
Sun 10/49:20 pm -
1 stop23h 22m
Deal found 9/5![Multiple Airlines logo]()
$455
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/281:35 pm -
1 stop7h 12m
Sun 11/17:00 am -
1 stop5h 29m
Deal found 9/5![United Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 9/3. 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 10/38:55 am -
2 stops8h 05m
Mon 10/54:55 pm -
2 stops5h 15m
Deal found 9/3![Southwest logo]()
$283
This Delta deal was found by Cheapflights users on 9/3. 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.
Tue 11/31:35 pm -
1 stop7h 05m
Sun 11/156:40 am -
1 stop8h 37m
Deal found 9/3![Delta logo]()
$307
Last-minute flights from Ontario to USADiscover last-minute flight deals from Ontario to USA. Data last updated September 8, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to USA. Data last updated September 8, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1012:07 pm -
Nonstop1h 36m
Mon 9/146:02 pm -
Nonstop1h 34m
Deal found 9/2![Frontier logo]()
$80
This Super.com deal was found by Cheapflights users on 9/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:07 pm -
Nonstop1h 36m
Mon 9/286:02 pm -
Nonstop1h 34m
Deal found 9/3![Frontier logo]()
$64
This Booking.com deal was found by Cheapflights users on 9/3. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:07 pm -
Nonstop1h 36m
Thu 9/246:02 pm -
Nonstop1h 34m
Deal found 9/3![Frontier logo]()
$70
This Booking.com deal was found by Cheapflights users on 9/3. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:07 pm -
Nonstop1h 36m
Fri 9/256:02 pm -
Nonstop1h 34m
Deal found 9/3![Frontier logo]()
$71
This Super.com deal was found by Cheapflights users on 9/3. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/2512:07 pm -
Nonstop1h 36m
Mon 9/286:02 pm -
Nonstop1h 34m
Deal found 9/3![Frontier logo]()
$84
This Booking.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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.
Thu 10/112:07 pm -
Nonstop1h 36m
Thu 10/86:02 pm -
Nonstop1h 38m
Deal found 9/2![Frontier logo]()
$65
This Travelocity deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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.
Thu 10/112:07 pm -
Nonstop1h 36m
Sat 10/33:15 pm -
1 stop15h 49m
Deal found 9/2![Frontier logo]()
$83
This Booking.com deal was found by Cheapflights users on 9/3. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/212:07 pm -
Nonstop1h 36m
Fri 10/26:02 pm -
Nonstop1h 34m
Deal found 9/3![Frontier logo]()
$60
This Frontier deal was found by Cheapflights users on 9/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/1512:01 pm -
Nonstop1h 31m
Mon 10/196:02 pm -
Nonstop1h 38m
Deal found 9/3![Frontier logo]()
$82
This Trip.com deal was found by Cheapflights users on 9/3. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1612:01 pm -
Nonstop1h 31m
Sun 10/256:02 pm -
Nonstop1h 38m
Deal found 9/3![Frontier logo]()
$69
This Frontier deal was found by Cheapflights users on 9/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2312:01 pm -
Nonstop1h 31m
Sun 10/256:02 pm -
Nonstop1h 38m
Deal found 9/3![Frontier logo]()
$75
This Kiwi.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 10/2512:01 pm -
Nonstop1h 31m
Sun 10/256:02 pm -
Nonstop1h 38m
Deal found 9/2![Frontier logo]()
$73
One-way flights from Ontario to USASearch for one-way flight options from Ontario to USA. Find affordable one-way fares based on user searches. Data last updated September 8, 2026.
Search for one-way flight options from Ontario to USA. Find affordable one-way fares based on user searches. Data last updated September 8, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 9/3. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/176:25 am -
Nonstop2h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Frontier logo]()
$33
This Super.com deal was found by Cheapflights users on 9/4. 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 10/2811:52 am -
Nonstop2h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Frontier logo]()
$34
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 12/54:46 pm -
Nonstop2h 23m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/5![Frontier logo]()
$35
This Frontier deal was found by Cheapflights users on 9/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1612:01 pm -
Nonstop1h 31m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Frontier logo]()
$41
This Super.com deal was found by Cheapflights users on 9/4. 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.
Fri 12/257:11 am -
Nonstop1h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Frontier logo]()
$42
This Kiwi.com deal was found by Cheapflights users on 9/3. 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.
Wed 9/3011:45 am -
Nonstop2h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Frontier logo]()
$42
This Super.com deal was found by Cheapflights users on 9/4. 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.
Tue 12/17:11 am -
Nonstop1h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Frontier logo]()
$43
This Kiwi.com deal was found by Cheapflights users on 9/3. 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.
Sat 10/311:45 am -
Nonstop2h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Frontier logo]()
$43
This Frontier deal was found by Cheapflights users on 9/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/286:15 am -
Nonstop2h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/3![Frontier logo]()
$44
This Trip.com deal was found by Cheapflights users on 9/4. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/87:11 am -
Nonstop1h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Frontier logo]()
$47
This Kiwi.com deal was found by Cheapflights users on 9/4. 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.
Mon 11/26:25 am -
Nonstop2h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/4![Frontier logo]()
$54
This Super.com deal was found by Cheapflights users on 9/2. Clicking the “Pick Dates” 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 9/248:00 am -
1 stop5h 19m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/2![Frontier logo]()
$58
Find flight deals from Ontario to USA
Keep the following information in mind while searching for Ontario to USA flight deals. Data was last updated September 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $60 (Booking.com) |
One-way from | $33 (Cheapflightsfares) |
Popular in | July |
Cheapest in | January |
Average price | $412 |
Good round-trip deal | $186 or less |
Good one-way deal | $128 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to USA 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 8, 2026.
Use the filters below to find and compare flights from Ontario to the United States that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioSan Francisco
ONT Ontario - SFO San Francisco
ONTSFO
Ontario
Tue 9/29
1:52 pm-3:21 pm
Nonstop1h 29m
San Francisco
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$59
OntarioDenver
ONT Ontario - DEN Denver Intl
ONTDEN
Ontario
Sat 12/5
7:11 am-12:32 am
1 stop16h 21m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$85
OntarioDenver
ONT Ontario - DEN Denver Intl
ONTDEN
Ontario
Thu 11/26
6:00 am-1:58 pm
1 stop6h 58m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$89
OntarioDenver
ONT Ontario - DEN Denver Intl
ONTDEN
Ontario
Sat 10/31
6:02 am-2:08 pm
1 stop7h 06m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$89
Quickest round-trip
OntarioLas Vegas
ONT Ontario - LAS Las Vegas Harry Reid Intl
ONTLAS
Ontario
Fri 10/30
5:15 pm-6:20 pm
Nonstop1h 05m
Las Vegas Harry Reid Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$90
OntarioSeattle
ONT Ontario - SEA Seattle/Tacoma Intl
ONTSEA
Ontario
Tue 10/27
10:25 am-9:45 pm
2 stops11h 20m
Seattle/Tacoma Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$94
OntarioSan Francisco
ONT Ontario - SFO San Francisco
ONTSFO
Ontario
Sat 10/17
8:03 am-9:30 am
Nonstop1h 27m
San Francisco
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$94
OntarioLas Vegas
ONT Ontario - LAS Las Vegas Harry Reid Intl
ONTLAS
Ontario
Mon 10/5
6:07 am-10:17 am
1 stop4h 10m
Las Vegas Harry Reid Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$100
OntarioLas Vegas
ONT Ontario - LAS Las Vegas Harry Reid Intl
ONTLAS
Ontario
Mon 10/12
6:15 pm-10:35 pm
1 stop4h 20m
Las Vegas Harry Reid Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$100
OntarioChicago
ONT Ontario - ORD Chicago O'Hare Intl
ONTORD
Ontario
Sat 10/3
11:45 am-12:23 am
1 stop10h 38m
Chicago O'Hare Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$102
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Ontario to USA
Have a flexible travel schedule? Discover the best time to fly to USA from Ontario with our price prediction graph.
ONT-SEA
ONT-SFO
ONT-DEN
ONT-LAS
ONT-HNL
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 the United States
ONT-US0
ONT-SEA
ONT-SFO
ONT-DEN
ONT-LAS
What is the cheapest month to book a flight from Ontario to USA?
Currently, October is the cheapest month in which you can book a flight from Ontario to USA (average of $313). Flying from Ontario to USA in July is currently the most expensive (average of $424). 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 US?
Find hourly flight availability from Ontario to USA. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 8, 2026.
A simple way to save on the total cost of your ticket is to fly from Ontario to USA in the evening. If you’re flexible enough to do this you can expect to save up to 50% on your trip compared to booking a flight in the morning.
How often are flights from Ontario to the United States delayed?
About 13% of weekly flights between Ontario and United States have experienced delays in the past year, with the average delay time being 125 minutes.
What is the most punctual flight time for Ontario to the United States flights?
Historically, flights departing in the morning are less likely to be delayed, whereas flights leaving in the evening tend to experience delays more often.
What day of the week experiences the fewest flight delays on this route?
Sunday tends to have the lowest number of delays on this route, whereas Friday has historically faced a higher average of delays compared to other days of the week.
Which airline has the best punctuality record on Ontario to the United States flights?
Over the last year, Delta have had the lowest number of delays on this route, with just 6% of flights being delayed.
How far ahead should I book a flight from Ontario to USA?
Booking 30 days in advance of your planned departure date is, on average, the best time to get cheap flights from Ontario to USA. 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 USA?
Use this chart to determine the cheapest time to fly round-trip from Ontario to USA. Price data was last updated on September 5, 2026.
Travelers seeking maximum savings on their Ontario to USA flight should consider departing on Friday evenings when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing USA
Get insights into the airlines that provide service to USA. 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 USA. Reviews last updated September 8, 2026.
Read reviews from past customers who have flown Southwest,Alaska Airlines, andUnited Airlines from Ontario to the United States. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Food
7.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Food
7.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Food
7.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Food
7.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Food
7.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Entertainment
7.5
Boarding
8.1
Comfort
8.0
Food
7.0
Crew
8.6
Overall
8.0
Reviews
1 / 20
8.0
ExcellentLa Tracimeldamarcos,Jun 2026
LAX - SLC
Related info for your journey
Find useful and relevant information for your journey from Ontario to USA. 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
Top regions
Alternative routes for Ontario to USA
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to USA by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to USA by cabin class
Find flights from Ontario to USA, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and USA flights
Browse other Ontario and USA flight options. Last updated on September 8, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to USA flights
Consider these flights traveling from Ontario to USA.
Fly to USA regions
Consider these flights traveling to USA regions.
Top 7 airlines flying from Ontario to USA
Discover the top 7 airlines that operate flights from Ontario to USA. 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 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$50 | Average$240 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$91 | Average$398 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$98 | Average$406 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$120 | Average$352 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$128 | Average$442 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$149 | Average$427 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$206 | Average$442 | FlexibilityNo cancel fee | On-time71% |