$29+ 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 11/14. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Nov 22 — Nov 291
Round-trip
1 adult, Economy
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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
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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 October 23, 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 October 23, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/37:06 pm -
Nonstop1h 34m
Sun 12/69:56 pm -
Nonstop1h 27m
Deal found 10/20![Frontier logo]()
$79
This CheapOair deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/72:53 pm -
1 stop18h 41m
Tue 12/89:56 pm -
Nonstop1h 27m
Deal found 10/21![Frontier logo]()
$81
This Super.com deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/17:06 pm -
Nonstop1h 34m
Sat 12/59:56 pm -
Nonstop1h 27m
Deal found 10/20![Frontier logo]()
$82
This WAYA deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure WAYA is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/58:44 am -
1 stop10h 53m
Sun 12/69:56 pm -
Nonstop1h 27m
Deal found 10/23![Frontier logo]()
$84
This CheapOair deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:06 pm -
Nonstop1h 34m
Thu 12/310:35 am -
1 stop7h 36m
Deal found 10/22![Frontier logo]()
$86
This CheapOair deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/212:01 pm -
1 stop17h 48m
Wed 12/99:56 pm -
Nonstop1h 27m
Deal found 10/22![Frontier logo]()
$87
This Kiwi.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/258:15 am -
1 stop6h 19m
Wed 12/29:35 pm -
Nonstop1h 23m
Deal found 10/21![Frontier logo]()
$88
This Mytrip deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1410:00 am -
1 stop8h 19m
Wed 11/189:14 am -
1 stop7h 07m
Deal found 10/21![Frontier logo]()
$89
This Kiwi.com deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/17:06 pm -
Nonstop1h 34m
Tue 12/159:56 pm -
Nonstop1h 27m
Deal found 10/19![Frontier logo]()
$90
This Kiwi.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/238:31 pm -
Nonstop1h 33m
Sat 12/59:56 pm -
Nonstop1h 27m
Deal found 10/21![Frontier logo]()
$91
This Mytrip deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/58:44 am -
1 stop10h 53m
Mon 12/79:16 pm -
1 stop14h 35m
Deal found 10/22![Frontier logo]()
$92
This CheapOair deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/308:31 pm -
Nonstop1h 33m
Wed 12/29:35 pm -
Nonstop1h 23m
Deal found 10/21![Frontier logo]()
$93
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 October 23, 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 October 23, 2026.
This Southwest deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/165:55 am -
1 stop4h 35m
Fri 12/1810:55 pm -
Nonstop1h 00m
Deal found 10/21![Southwest logo]()
$110
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/76:37 pm -
Nonstop1h 33m
Sun 1/104:10 pm -
Nonstop1h 25m
Deal found 10/22![United Airlines logo]()
$159
This Mytrip deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/258:15 am -
Nonstop1h 06m
Wed 12/23:45 pm -
1 stop7h 13m
Deal found 10/18![Frontier logo]()
$161
This Southwest deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/51:10 pm -
2 stops6h 00m
Sat 12/127:45 am -
Nonstop1h 05m
Deal found 10/21![Southwest logo]()
$115
This Alaska Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/310:50 am -
Nonstop2h 30m
Sun 12/69:33 pm -
Nonstop2h 21m
Deal found 10/22![Alaska Airlines logo]()
$245
This Delta deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1011:57 am -
Nonstop3h 03m
Mon 12/142:30 pm -
Nonstop2h 45m
Deal found 10/22![Delta logo]()
$258
This United Airlines deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/86:00 am -
Nonstop1h 33m
Sun 1/108:54 pm -
Nonstop1h 36m
Deal found 10/20![United Airlines logo]()
$159
This Southwest deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/51:05 pm -
2 stops7h 05m
Mon 12/712:00 pm -
2 stops7h 55m
Deal found 10/20![Southwest logo]()
$153
This Frontier deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/28:35 pm -
Nonstop1h 09m
Tue 11/33:24 pm -
1 stop8h 27m
Deal found 10/18![Frontier logo]()
$184
This KAYAK deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/711:59 pm -
2 stops13h 17m
Wed 12/92:54 pm -
1 stop10h 13m
Deal found 10/22![American Airlines logo]()
$372
This Southwest deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/711:00 am -
1 stop3h 50m
Sun 1/105:40 am -
1 stop5h 40m
Deal found 10/20![Southwest logo]()
$160
This United Airlines deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/511:20 am -
Nonstop1h 30m
Sat 12/54:10 pm -
Nonstop1h 26m
Deal found 10/20![United Airlines logo]()
$204
This Southwest deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” 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 11/1112:50 pm -
1 stop3h 25m
Fri 11/135:05 pm -
2 stops5h 15m
Deal found 10/23![Southwest logo]()
$173
This Southwest deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1012:50 pm -
2 stops7h 20m
Wed 12/169:25 am -
2 stops8h 15m
Deal found 10/18![Southwest logo]()
$175
This Delta deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/1611:57 am -
Nonstop3h 03m
Thu 12/318:25 am -
Nonstop2h 54m
Deal found 10/23![Delta logo]()
$258
This Alaska Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/2511:55 am -
Nonstop2h 50m
Fri 1/15:28 pm -
Nonstop2h 35m
Deal found 10/22![Alaska Airlines logo]()
$263
This United Airlines deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 1/1011:20 am -
Nonstop1h 33m
Wed 1/274:10 pm -
Nonstop1h 25m
Deal found 10/21![United Airlines logo]()
$229
This Delta deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/147:00 am -
Nonstop3h 05m
Sun 1/177:55 pm -
Nonstop2h 48m
Deal found 10/21![Delta logo]()
$262
This Alaska Airlines deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/96:00 am -
1 stop7h 28m
Sat 1/93:00 pm -
Nonstop2h 17m
Deal found 10/18![Alaska Airlines logo]()
$267
This Booking.com deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/117:26 pm -
1 stop26h 48m
Sun 12/139:37 am -
1 stop13h 46m
Deal found 10/18![Frontier logo]()
$267
This Southwest deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/1012:50 pm -
2 stops7h 20m
Sun 12/134:15 pm -
1 stop6h 45m
Deal found 10/18![Southwest logo]()
$184
This United Airlines deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/311:20 am -
Nonstop1h 30m
Wed 12/97:10 pm -
Nonstop1h 28m
Deal found 10/19![United Airlines logo]()
$229
This Alaska Airlines deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/184:09 pm -
Nonstop2h 47m
Fri 11/278:34 am -
Nonstop2h 37m
Deal found 10/18![Alaska Airlines logo]()
$267
This Delta deal was found by Cheapflights users on 10/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/311:57 am -
Nonstop3h 03m
Wed 12/92:30 pm -
Nonstop2h 45m
Deal found 10/19![Delta logo]()
$267
This Southwest deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/134:00 pm -
1 stop6h 00m
Sun 11/159:00 pm -
1 stop10h 45m
Deal found 10/20![Southwest logo]()
$199
This Delta deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/157:00 am -
1 stop7h 47m
Wed 11/187:30 am -
2 stops11h 46m
Deal found 10/20![Delta logo]()
$277
This Alaska Airlines deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/115:01 pm -
Nonstop2h 52m
Wed 12/169:50 am -
1 stop7h 06m
Deal found 10/18![Alaska Airlines logo]()
$282
This United Airlines deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:00 am -
Nonstop1h 30m
Wed 11/44:35 pm -
Nonstop1h 26m
Deal found 10/18![United Airlines logo]()
$279
This Southwest deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/1212:20 pm -
Nonstop2h 10m
Mon 2/155:05 am -
1 stop4h 10m
Deal found 10/20![Southwest logo]()
$219
This Delta deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/45:55 pm -
Nonstop3h 05m
Mon 12/78:25 am -
Nonstop2h 52m
Deal found 10/18![Delta logo]()
$292
Last-minute flights from Ontario to USADiscover last-minute flight deals from Ontario to USA. Data last updated October 23, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to USA. Data last updated October 23, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” 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 11/75:07 pm -
Nonstop1h 11m
Mon 11/910:05 am -
Nonstop1h 11m
Deal found 10/23![Frontier logo]()
$98
This CheapOair deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/122:23 pm -
Nonstop1h 08m
Fri 11/133:19 pm -
1 stop4h 11m
Deal found 10/22![Frontier logo]()
$99
This Mytrip deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1410:00 am -
1 stop8h 19m
Wed 11/189:14 am -
1 stop7h 07m
Deal found 10/21![Frontier logo]()
$89
This Mytrip deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1410:00 am -
1 stop8h 19m
Tue 11/179:14 am -
1 stop7h 07m
Deal found 10/22![Frontier logo]()
$90
This Mytrip deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1410:00 am -
1 stop8h 19m
Mon 11/1610:23 pm -
1 stop11h 17m
Deal found 10/22![Frontier logo]()
$97
This Frontier deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1411:52 am -
Nonstop2h 21m
Sun 11/159:10 am -
Nonstop2h 25m
Deal found 10/23![Frontier logo]()
$98
This Southwest deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/145:45 am -
Nonstop1h 05m
Sat 11/217:55 am -
Nonstop1h 05m
Deal found 10/21![Southwest logo]()
$100
This CheapOair deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/212:01 pm -
1 stop17h 48m
Wed 12/99:56 pm -
Nonstop1h 27m
Deal found 10/22![Frontier logo]()
$87
This Kiwi.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/218:31 pm -
Nonstop1h 33m
Fri 12/49:35 pm -
Nonstop1h 23m
Deal found 10/21![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/238:31 pm -
Nonstop1h 33m
Sat 12/59:56 pm -
Nonstop1h 27m
Deal found 10/21![Frontier logo]()
$91
This Kiwi.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/258:15 am -
1 stop6h 19m
Wed 12/29:35 pm -
Nonstop1h 23m
Deal found 10/21![Frontier logo]()
$88
This CheapOair deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/308:31 pm -
Nonstop1h 33m
Wed 12/29:35 pm -
Nonstop1h 23m
Deal found 10/21![Frontier logo]()
$93
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 October 23, 2026.
Search for one-way flight options from Ontario to USA. Find affordable one-way fares based on user searches. Data last updated October 23, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1411:52 am -
Nonstop2h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$29
This Super.com deal was found by Cheapflights users on 10/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2912:01 pm -
Nonstop1h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/18![Frontier logo]()
$44
This Super.com deal was found by Cheapflights users on 10/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/137:26 pm -
Nonstop1h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/20![Frontier logo]()
$45
This Trip.com deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/88:44 am -
1 stop8h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Frontier logo]()
$46
This Mytrip deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/98:44 am -
1 stop8h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Frontier logo]()
$47
This Trip.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/47:06 pm -
Nonstop1h 34m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$49
This Super.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:30 am -
Nonstop2h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$49
This Trip.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/63:33 pm -
1 stop21h 49m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$52
This Super.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1212:01 pm -
Nonstop1h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$54
This Booking.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/1312:01 pm -
Nonstop1h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$55
This Mytrip deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/108:44 am -
1 stop8h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$56
This CheapOair deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/218:31 pm -
Nonstop1h 33m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Frontier logo]()
$57
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 October 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $79 (Cheapflightsfares) |
One-way from | $29 (Cheapflightsfares) |
Popular in | September |
Cheapest in | January |
Average price | $478 |
Good round-trip deal | $162 or less |
Good one-way deal | $93 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 October 23, 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
Wed 12/2
5:45 am-9:40 am
1 stop3h 55m
San Francisco
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$66
OntarioPortland
ONT Ontario - PDX Portland
ONTPDX
Ontario
Thu 11/19
9:25 am-2:37 pm
1 stop5h 12m
Portland
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$109
OntarioLas Vegas
ONT Ontario - LAS Las Vegas Harry Reid Intl
ONTLAS
Ontario
Sat 11/7
5:35 am-8:55 am
1 stop3h 20m
Las Vegas Harry Reid Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$109
Quickest round-trip
OntarioSan Francisco
ONT Ontario - SFO San Francisco
ONTSFO
Ontario
Thu 11/26
6:00 am-7:30 am
Nonstop1h 30m
San Francisco
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$109
OntarioLas Vegas
ONT Ontario - LAS Las Vegas Harry Reid Intl
ONTLAS
Ontario
Wed 12/16
5:55 am-10:30 am
1 stop4h 35m
Las Vegas Harry Reid Intl
Fri 12/18
10:55 pm-11:55 pm
Nonstop1h 00m
$110
OntarioDenver
ONT Ontario - DEN Denver Intl
ONTDEN
Ontario
Fri 11/27
11:40 am-3:01 pm
Nonstop2h 21m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$114
OntarioLas Vegas
ONT Ontario - LAS Las Vegas Harry Reid Intl
ONTLAS
Ontario
Sun 11/15
5:55 am-9:15 am
1 stop3h 20m
Las Vegas Harry Reid Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$115
OntarioLas Vegas
ONT Ontario - LAS Las Vegas Harry Reid Intl
ONTLAS
Ontario
Sat 12/5
1:10 pm-7:10 pm
2 stops6h 00m
Las Vegas Harry Reid Intl
Sat 12/12
7:45 am-8:50 am
Nonstop1h 05m
$115
OntarioChicago
ONT Ontario - ORD Chicago O'Hare Intl
ONTORD
Ontario
Wed 11/11
7:05 am-5:05 pm
1 stop8h 00m
Chicago O'Hare Intl
Wed 12/31
12:00 am-10:00 pm
Nonstop0h 00m
$119
OntarioLas Vegas
ONT Ontario - LAS Las Vegas Harry Reid Intl
ONTLAS
Ontario
Sat 12/5
6:50 am-12:10 pm
2 stops5h 20m
Las Vegas Harry Reid Intl
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$120
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-DEN
ONT-SFO
ONT-LAS
ONT-PDX
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 the United States
ONT-US0
ONT-DEN
ONT-SFO
ONT-LAS
ONT-PDX
What is the cheapest month to book a flight from Ontario to USA?
Currently, January is the cheapest month in which you can book a flight from Ontario to USA (average of $315). Flying from Ontario to USA in June 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 October 23, 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 44 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 October 17, 2026.
Travelers seeking maximum savings on their Ontario to USA flight should consider departing on Monday at noon when fares are most often at their lowest. Wednesday mornings 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 October 23, 2026.
Read reviews from past customers who have flown Alaska Airlines,Southwest, 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.
Food
7.0
Crew
8.5
Entertainment
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Food
7.0
Crew
8.5
Entertainment
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Food
7.0
Crew
8.5
Entertainment
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Food
7.0
Crew
8.5
Entertainment
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Food
7.0
Crew
8.5
Entertainment
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Food
7.0
Crew
8.5
Entertainment
7.0
Boarding
8.1
Comfort
7.8
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
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.
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Alternative routes for Ontario to USA
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Complete your trip
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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 October 23, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to USA flights
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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 October 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$51 | Average$259 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$91 | Average$370 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$117 | Average$431 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$120 | Average$361 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$128 | Average$443 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$168 | Average$432 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$230 | Average$457 | FlexibilityNo cancel fee | On-time71% |