$29+ Cheap flights from Ontario (ONT) to the United States
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 3/7. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Mar 17 — Mar 241
1 adult, Economy
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Find cheap flights from Ontario to USA with Cheapflights
1. Tell us where you want to go
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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 February 15, 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 February 15, 2026.
This Booking.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/142:23 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Mon 3/237:00 am
LAS
- ONT
Nonstop1h 06m
Frontier
Deal found 2/12![Frontier logo]()
$59
This Super.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 2/197:22 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Thu 2/265:17 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 2/12![Frontier logo]()
$61
This Super.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/47:17 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Sat 3/712:40 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Deal found 2/12![Frontier logo]()
$62
This CheapOair deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/72:46 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Tue 3/1012:17 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Deal found 2/12![Frontier logo]()
$63
This Frontier deal was found by Cheapflights users on 2/14. Clicking the “Pick Dates” 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 3/77:10 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Mon 3/97:00 am
LAS
- ONT
Nonstop1h 06m
Frontier
Deal found 2/14![Frontier logo]()
$64
This Frontier deal was found by Cheapflights users on 2/14. Clicking the “Pick Dates” 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 3/910:57 am
ONT
- LAS
Nonstop1h 13m
Frontier
Mon 3/92:28 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 2/14![Frontier logo]()
$65
This Trip.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/287:31 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Sat 4/410:30 am
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 2/12![Frontier logo]()
$67
This Super.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/53:24 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Fri 3/67:00 am
LAS
- ONT
Nonstop1h 06m
Frontier
Deal found 2/12![Frontier logo]()
$68
This Frontier deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” 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 3/102:23 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Mon 3/167:00 am
LAS
- ONT
Nonstop1h 06m
Frontier
Deal found 2/13![Frontier logo]()
$69
This Frontier deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” 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 3/233:30 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Wed 3/257:55 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 2/13![Frontier logo]()
$70
This Super.com deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” 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 3/47:17 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Tue 3/1012:17 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Deal found 2/13![Frontier logo]()
$72
This Kiwi.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/217:29 pm
ONT
- DFW
1 stop8h 21m
Frontier
Tue 4/284:15 pm
DFW
- ONT
1 stop9h 40m
Frontier
Deal found 2/12![Frontier logo]()
$127
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 February 15, 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 February 15, 2026.
This Southwest deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” 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 3/2510:35 am
ONT
- LAS
Nonstop1h 05m
Southwest
Wed 4/19:35 pm
LAS
- ONT
Nonstop1h 00m
Southwest
Deal found 2/13![Southwest logo]()
$137
This Delta deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” 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 3/65:00 pm
ONT
- SEA
1 stop7h 09m
Delta
Mon 3/94:55 pm
SEA
- ONT
1 stop6h 56m
Delta
Deal found 2/13![Delta logo]()
$137
This Alaska Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/146:00 am
ONT
- SEA
Nonstop2h 54m
Alaska Airlines
Sat 4/189:24 pm
SEA
- ONT
Nonstop2h 35m
Alaska Airlines
Deal found 2/12![Alaska Airlines logo]()
$137
This United Airlines deal was found by Cheapflights users on 2/14. Clicking the “Pick Dates” 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 3/106:15 am
ONT
- SFO
Nonstop1h 33m
United Airlines
Tue 3/1010:50 am
SFO
- ONT
Nonstop1h 28m
United Airlines
Deal found 2/14![United Airlines logo]()
$152
This CheapOair deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 4/235:33 pm
ONT
- PHX
1 stop6h 14m
Frontier
Mon 4/276:45 pm
PHX
- ONT
1 stop5h 10m
Frontier
Deal found 2/12![Frontier logo]()
$160
This American Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/265:02 pm
ONT
- PHX
Nonstop1h 23m
American Airlines
Sat 3/287:27 am
PHX
- ONT
Nonstop1h 24m
American Airlines
Deal found 2/12![American Airlines logo]()
$171
This JetBlue deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1211:59 pm
ONT
- JFK
Nonstop5h 22m
JetBlue
Tue 8/187:35 pm
JFK
- ONT
Nonstop6h 05m
JetBlue
Deal found 2/13![JetBlue logo]()
$264
This Delta deal was found by Cheapflights users on 2/14. Clicking the “Pick Dates” 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 3/111:20 pm
ONT
- SEA
1 stop5h 08m
Delta
Sat 3/145:30 am
SEA
- ONT
1 stop6h 53m
Delta
Deal found 2/14![Delta logo]()
$137
This Alaska Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/56:14 am
ONT
- SEA
Nonstop2h 55m
Alaska Airlines
Sun 3/88:30 am
SEA
- ONT
Nonstop2h 38m
Alaska Airlines
Deal found 2/12![Alaska Airlines logo]()
$137
This Delta deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/111:25 pm
ONT
- SEA
1 stop5h 23m
Delta
Sat 5/165:45 pm
SEA
- ONT
1 stop5h 00m
Delta
Deal found 2/13![Delta logo]()
$137
This Southwest deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” 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 5/1310:55 am
ONT
- PHX
1 stop3h 45m
Southwest
Sat 5/165:40 pm
PHX
- ONT
1 stop3h 05m
Southwest
Deal found 2/13![Southwest logo]()
$154
This United Airlines deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” 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 3/256:37 pm
ONT
- LAS
1 stop6h 21m
United Airlines
Wed 4/16:00 am
LAS
- ONT
1 stop6h 20m
United Airlines
Deal found 2/13![United Airlines logo]()
$157
This Frontier deal was found by Cheapflights users on 2/15. Clicking the “Pick Dates” 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 4/166:15 am
ONT
- PHX
1 stop9h 23m
Frontier
Fri 4/176:45 pm
PHX
- ONT
1 stop5h 10m
Frontier
Deal found 2/15![Frontier logo]()
$160
This Alaska Airlines deal was found by Cheapflights users on 2/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/288:30 am
ONT
- HNL
Nonstop6h 05m
Multiple Airlines
Tue 5/59:09 pm
HNL
- ONT
1 stop9h 36m
Multiple Airlines
Deal found 2/15![Multiple Airlines logo]()
$339
This American Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/97:59 pm
ONT
- PHX
Nonstop1h 21m
American Airlines
Fri 3/137:27 am
PHX
- ONT
Nonstop1h 24m
American Airlines
Deal found 2/12![American Airlines logo]()
$171
This Southwest deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/712:40 pm
ONT
- LAS
1 stop4h 05m
Southwest
Tue 4/76:10 pm
LAS
- ONT
1 stop3h 20m
Southwest
Deal found 2/11![Southwest logo]()
$157
This Alaska Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/196:00 am
ONT
- SEA
Nonstop2h 54m
Alaska Airlines
Wed 3/259:26 pm
SEA
- ONT
Nonstop2h 33m
Alaska Airlines
Deal found 2/12![Alaska Airlines logo]()
$157
This Frontier deal was found by Cheapflights users on 2/15. Clicking the “Pick Dates” 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 3/106:15 am
ONT
- PHX
1 stop11h 31m
Frontier
Wed 3/117:15 am
PHX
- ONT
1 stop9h 00m
Frontier
Deal found 2/15![Frontier logo]()
$160
This United Airlines deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” 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 3/191:40 pm
ONT
- SFO
Nonstop1h 33m
United Airlines
Sat 3/219:30 pm
SFO
- ONT
Nonstop1h 27m
United Airlines
Deal found 2/13![United Airlines logo]()
$171
This Southwest deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/176:50 pm
ONT
- PHX
1 stop4h 05m
Southwest
Tue 4/212:50 pm
PHX
- ONT
2 stops6h 00m
Southwest
Deal found 2/12![Southwest logo]()
$159
This Frontier deal was found by Cheapflights users on 2/15. Clicking the “Pick Dates” 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 4/246:15 am
ONT
- PHX
1 stop9h 23m
Frontier
Mon 4/2711:20 am
PHX
- ONT
1 stop8h 44m
Frontier
Deal found 2/15![Frontier logo]()
$160
This Delta deal was found by Cheapflights users on 2/14. Clicking the “Pick Dates” 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 3/1911:59 am
ONT
- SEA
Nonstop2h 56m
Delta
Sun 3/227:50 pm
SEA
- ONT
Nonstop2h 44m
Delta
Deal found 2/14![Delta logo]()
$167
This United Airlines deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” 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 4/2911:05 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Sun 5/38:10 am
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 2/13![United Airlines logo]()
$178
This Alaska Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/147:41 pm
ONT
- SEA
Nonstop2h 49m
Alaska Airlines
Sun 5/248:23 am
SEA
- ONT
Nonstop2h 44m
Alaska Airlines
Deal found 2/12![Alaska Airlines logo]()
$187
This Southwest deal was found by Cheapflights users on 2/15. Clicking the “Pick Dates” 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 3/303:05 pm
ONT
- PHX
Nonstop1h 20m
Southwest
Thu 4/211:20 am
PHX
- ONT
Nonstop1h 20m
Southwest
Deal found 2/15![Southwest logo]()
$171
This Expedia deal was found by Cheapflights users on 2/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/157:29 pm
ONT
- DFW
1 stop8h 21m
Frontier
Sat 4/184:15 pm
DFW
- ONT
1 stop9h 40m
Frontier
Deal found 2/15![Frontier logo]()
$173
This Delta deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 4/65:53 pm
ONT
- SEA
Nonstop2h 57m
Delta
Sun 4/125:30 am
SEA
- ONT
1 stop6h 53m
Delta
Deal found 2/12![Delta logo]()
$177
This United Airlines deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/31:27 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Wed 4/229:09 pm
SFO
- ONT
Nonstop1h 36m
United Airlines
Deal found 2/13![United Airlines logo]()
$178
This Southwest deal was found by Cheapflights users on 2/14. Clicking the “Pick Dates” 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 3/1710:35 am
ONT
- LAS
Nonstop1h 05m
Southwest
Wed 3/189:20 am
LAS
- ONT
Nonstop1h 05m
Southwest
Deal found 2/14![Southwest logo]()
$171
This Alaska Airlines deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/167:10 pm
ONT
- SEA
1 stop12h 05m
Alaska Airlines
Tue 5/199:22 pm
SEA
- ONT
Nonstop2h 36m
Alaska Airlines
Deal found 2/13![Alaska Airlines logo]()
$190
Last-minute flights from Ontario to USADiscover last-minute flight deals from Ontario to USA. Data last updated February 15, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to USA. Data last updated February 15, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 2/197:22 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Thu 2/265:17 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 2/12![Frontier logo]()
$61
This Super.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/47:17 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Sat 3/712:40 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Deal found 2/12![Frontier logo]()
$62
This Super.com deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” 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 3/47:17 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Tue 3/1012:17 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Deal found 2/13![Frontier logo]()
$72
This Super.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/53:24 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Fri 3/67:00 am
LAS
- ONT
Nonstop1h 06m
Frontier
Deal found 2/12![Frontier logo]()
$68
This CheapOair deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/72:46 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Tue 3/1012:17 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Deal found 2/12![Frontier logo]()
$63
This Frontier deal was found by Cheapflights users on 2/14. Clicking the “Pick Dates” 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 3/77:10 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Mon 3/97:00 am
LAS
- ONT
Nonstop1h 06m
Frontier
Deal found 2/14![Frontier logo]()
$64
This Frontier deal was found by Cheapflights users on 2/14. Clicking the “Pick Dates” 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 3/910:57 am
ONT
- LAS
Nonstop1h 13m
Frontier
Mon 3/92:28 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 2/14![Frontier logo]()
$65
This Frontier deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” 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 3/102:23 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Mon 3/167:00 am
LAS
- ONT
Nonstop1h 06m
Frontier
Deal found 2/13![Frontier logo]()
$69
This Delta deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/115:09 pm
ONT
- SEA
1 stop6h 52m
Delta
Sun 3/158:30 am
SEA
- ONT
Nonstop2h 48m
Delta
Deal found 2/12![Delta logo]()
$127
This Booking.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/142:23 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Mon 3/237:00 am
LAS
- ONT
Nonstop1h 06m
Frontier
Deal found 2/12![Frontier logo]()
$59
This Frontier deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” 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 3/233:30 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Wed 3/257:55 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 2/13![Frontier logo]()
$70
This Trip.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/287:31 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Sat 4/410:30 am
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 2/12![Frontier logo]()
$67
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 February 15, 2026.
Search for one-way flight options from Ontario to USA. Find affordable one-way fares based on user searches. Data last updated February 15, 2026.
This Super.com deal was found by Cheapflights users on 2/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/72:46 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Deal found 2/11![Frontier logo]()
$29
This Trip.com deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/282:23 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Deal found 2/12![Frontier logo]()
$32
This Kiwi.com deal was found by Cheapflights users on 2/14. Clicking the “Pick Dates” 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 3/163:30 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 2/14![Frontier logo]()
$34
This CheapOair deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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.
Tue 3/242:23 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Deal found 2/12![Frontier logo]()
$35
This Frontier deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” 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 3/112:23 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Deal found 2/12![Frontier logo]()
$36
This CheapOair deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1911:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Deal found 2/12![Frontier logo]()
$40
This CheapOair deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” 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 3/147:31 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 2/13![Frontier logo]()
$41
This Jetabroad deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Jetabroad is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/27:18 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 2/12![Frontier logo]()
$43
This Frontier deal was found by Cheapflights users on 2/15. Clicking the “Pick Dates” 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 5/1611:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Deal found 2/15![Frontier logo]()
$45
This American Airlines deal was found by Cheapflights users on 2/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/149:53 am
ONT
- PHX
Nonstop1h 20m
American Airlines
Deal found 2/15![American Airlines logo]()
$46
This American Airlines deal was found by Cheapflights users on 2/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/116:15 am
ONT
- PHX
Nonstop1h 23m
American Airlines
Deal found 2/12![American Airlines logo]()
$49
This Frontier deal was found by Cheapflights users on 2/13. Clicking the “Pick Dates” 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 5/207:29 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 2/13![Frontier logo]()
$49
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 February 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $59 (Booking.com) |
One-way from | $29 (Super.com) |
Popular in | December |
Cheapest in | January |
Average price | $282 |
Good round-trip deal | $95 or less |
Good one-way deal | $95 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 2,558,603 searches. Data last updated February 15, 2026.
Use the filters below to find and compare flights from Ontario to the United States that are best for you.
Fly from
Ontario
Fly to
USA
Route
Depart
Return
Price
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Wed 3/25
10:35 am-11:40 am
Nonstop1h 05m
Las Vegas Harry Reid Intl
Wed 4/1
9:35 pm-10:35 pm
Nonstop1h 00m
$137
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Fri 3/6
5:00 pm-12:09 am
1 stop7h 09m
Seattle/Tacoma Intl
Mon 3/9
4:55 pm-11:51 pm
1 stop6h 56m
$137
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Tue 4/14
6:00 am-8:54 am
Nonstop2h 54m
Seattle/Tacoma Intl
Sat 4/18
9:24 pm-11:59 pm
Nonstop2h 35m
$137
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Wed 3/11
1:20 pm-6:28 pm
1 stop5h 08m
Seattle/Tacoma Intl
Sat 3/14
5:30 am-12:23 pm
1 stop6h 53m
$137
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Thu 3/5
6:14 am-9:09 am
Nonstop2h 55m
Seattle/Tacoma Intl
Sun 3/8
8:30 am-11:08 am
Nonstop2h 38m
$137
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Mon 5/11
1:25 pm-6:48 pm
1 stop5h 23m
Seattle/Tacoma Intl
Sat 5/16
5:45 pm-10:45 pm
1 stop5h 00m
$137
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Tue 3/10
6:15 am-7:48 am
Nonstop1h 33m
San Francisco
Tue 3/10
10:50 am-12:18 pm
Nonstop1h 28m
$152
OntarioPhoenix
ONT - PHX
ONTPHX
Ontario
Wed 5/13
10:55 am-2:40 pm
1 stop3h 45m
Phoenix Sky Harbor Intl
Sat 5/16
5:40 pm-8:45 pm
1 stop3h 05m
$154
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Wed 3/25
6:37 pm-12:58 am
1 stop6h 21m
Las Vegas Harry Reid Intl
Wed 4/1
6:00 am-12:20 pm
1 stop6h 20m
$157
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Tue 4/7
12:40 pm-4:45 pm
1 stop4h 05m
Las Vegas Harry Reid Intl
Tue 4/7
6:10 pm-9:30 pm
1 stop3h 20m
$157
Showing 1-10 of 60 results
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-LAS
ONT-SEA
ONT-PHX
ONT-DFW
ONT-IAH
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-LAS
ONT-SEA
ONT-PHX
ONT-DFW
What is the cheapest month to book a flight from Ontario to USA?
Currently, March is the cheapest month in which you can book a flight from Ontario to USA (average of $31). Flying from Ontario to USA in January is currently the most expensive (average of $53). 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 February 15, 2026.
A simple way to save on the total cost of your ticket is to fly from Ontario to USA in the afternoon. If you’re flexible enough to do this you can expect to save up to 28% on your trip compared to booking a flight in the morning.
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 February 7, 2026.
Travelers seeking maximum savings on their Ontario to USA flight should consider departing on Saturday evenings when fares are most often at their lowest. Wednesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
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 124 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?
Saturday tends to have the lowest number of delays on this route, whereas Monday 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 4% of flights being delayed.
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 February 15, 2026.
Read reviews from past customers who have flown Southwest, Delta, and United 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.
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Crew
8.6
Entertainment
7.5
Comfort
8.0
Boarding
8.1
Food
7.0
Overall
8.0
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
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
Complete your trip to USA by adding a car rental and/or hotel reservation to your travel itinerary.
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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 February 15, 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 8 airlines flying from Ontario to USA
Discover the top 8 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 2,558,603 searches. Data last updated February 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$24 | Average$149 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$32 | Average$185 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$58 | Average$383 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$67 | Average$269 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$97 | Average$369 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$155 | Average$329 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$178 | Average$374 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$190 | Average$417 | FlexibilityNo cancel fee | On-time71% |