$46+ 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 7/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
maj 25 — cze 11
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 Kwiecień 25, 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 Kwiecień 25, 2026.
This Super.com deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” 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.
śr. 6/31:39 pm
ONT
- LAS
Nonstop1h 10m
Frontier
pon. 6/86:22 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 4/24![Frontier logo]()
$74
This Kiwi.com deal was found by Cheapflights users on 4/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sob. 5/2311:51 am
ONT
- LAS
Nonstop1h 11m
Frontier
wt. 5/267:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 4/20![Frontier logo]()
$75
This Frontier deal was found by Cheapflights users on 4/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
pon. 6/153:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
śr. 6/176:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 4/20![Frontier logo]()
$76
This Frontier deal was found by Cheapflights users on 4/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
czw. 5/283:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
pt. 5/297:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 4/20![Frontier logo]()
$77
This Trip.com deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” 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.
wt. 7/213:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
śr. 7/226:46 pm
LAS
- ONT
Nonstop1h 07m
Frontier
Deal found 4/24![Frontier logo]()
$78
This Trip.com deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” 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.
pon. 7/63:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
śr. 7/81:56 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Deal found 4/24![Frontier logo]()
$79
This Super.com deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” 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.
pt. 6/263:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
ndz. 6/286:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 4/24![Frontier logo]()
$80
This Expedia deal was found by Cheapflights users on 4/23. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
pt. 6/263:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
pon. 6/296:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 4/23![Frontier logo]()
$81
This Expedia deal was found by Cheapflights users on 4/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sob. 5/3011:51 am
ONT
- LAS
Nonstop1h 11m
Frontier
pon. 6/16:22 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 4/21![Frontier logo]()
$82
This Kiwi.com deal was found by Cheapflights users on 4/21. 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.
pon. 7/611:43 am
ONT
- LAS
Nonstop1h 08m
Frontier
ndz. 7/126:40 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 4/21![Frontier logo]()
$84
This Frontier deal was found by Cheapflights users on 4/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ndz. 6/2811:58 am
ONT
- LAS
Nonstop1h 08m
Frontier
wt. 6/306:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 4/20![Frontier logo]()
$85
This Cheapflightsfares deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” 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.
śr. 5/276:00 am
ONT
- DEN
Nonstop2h 22m
Frontier
wt. 6/28:41 am
DEN
- ONT
Nonstop2h 24m
Frontier
Deal found 4/24![Frontier logo]()
$103
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 Kwiecień 25, 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 Kwiecień 25, 2026.
This Delta deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” 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.
sob. 5/231:29 pm
ONT
- DEN
1 stop4h 46m
Delta
pon. 5/255:30 am
DEN
- ONT
1 stop4h 23m
Delta
Deal found 4/24![Delta logo]()
$197
This Alaska Airlines deal was found by Cheapflights users on 4/23. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
pt. 5/154:03 pm
ONT
- SEA
Nonstop2h 49m
Alaska Airlines
wt. 5/199:22 pm
SEA
- ONT
Nonstop2h 36m
Alaska Airlines
Deal found 4/23![Alaska Airlines logo]()
$207
This United Airlines deal was found by Cheapflights users on 4/21. 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.
śr. 5/206:00 am
ONT
- SFO
Nonstop1h 29m
United Airlines
śr. 5/209:23 pm
SFO
- ONT
Nonstop1h 36m
United Airlines
Deal found 4/21![United Airlines logo]()
$225
This Southwest deal was found by Cheapflights users on 4/23. 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.
czw. 5/145:30 am
ONT
- LAS
Nonstop1h 05m
Southwest
pt. 5/157:35 pm
LAS
- ONT
Nonstop1h 05m
Southwest
Deal found 4/23![Southwest logo]()
$259
This JetBlue deal was found by Cheapflights users on 4/20. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sob. 5/2310:41 pm
ONT
- JFK
Nonstop5h 29m
JetBlue
pt. 5/295:30 pm
JFK
- ONT
Nonstop6h 17m
JetBlue
Deal found 4/20![JetBlue logo]()
$297
This Alaska Airlines deal was found by Cheapflights users on 4/21. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
pt. 5/156:00 am
ONT
- SEA
Nonstop2h 52m
Alaska Airlines
pon. 5/188:30 am
SEA
- ONT
Nonstop2h 40m
Alaska Airlines
Deal found 4/21![Alaska Airlines logo]()
$217
This Delta deal was found by Cheapflights users on 4/23. 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.
czw. 5/141:35 pm
ONT
- SEA
Nonstop3h 00m
Delta
pon. 5/189:45 am
SEA
- ONT
Nonstop2h 50m
Delta
Deal found 4/23![Delta logo]()
$218
This KAYAK deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” 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.
pon. 7/201:10 pm
ONT
- LAS
1 stop6h 05m
American Airlines
pt. 7/244:33 pm
LAS
- ONT
1 stop5h 11m
American Airlines
Deal found 4/24![American Airlines logo]()
$443
This United Airlines deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” 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.
czw. 6/46:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
ndz. 6/710:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 4/24![United Airlines logo]()
$238
This United Airlines deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” 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.
sob. 5/301:40 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
pon. 6/19:00 pm
SFO
- ONT
Nonstop1h 37m
United Airlines
Deal found 4/24![United Airlines logo]()
$248
This Southwest deal was found by Cheapflights users on 4/20. 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.
śr. 7/16:25 pm
ONT
- LAS
1 stop3h 45m
Southwest
śr. 7/812:45 pm
LAS
- ONT
2 stops5h 50m
Southwest
Deal found 4/20![Southwest logo]()
$276
This Delta deal was found by Cheapflights users on 4/20. 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.
śr. 9/2312:00 pm
ONT
- HOU
1 stop7h 35m
Delta
wt. 9/2910:05 am
HOU
- ONT
1 stop9h 56m
Delta
Deal found 4/20![Delta logo]()
$257
This JetBlue deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” 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.
wt. 8/1111:50 pm
ONT
- JFK
Nonstop5h 21m
JetBlue
wt. 8/187:30 pm
JFK
- ONT
Nonstop6h 05m
JetBlue
Deal found 4/24![JetBlue logo]()
$297
This Southwest deal was found by Cheapflights users on 4/23. 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.
pt. 5/293:00 pm
ONT
- LAS
1 stop4h 20m
Southwest
ndz. 5/317:35 am
LAS
- ONT
1 stop3h 30m
Southwest
Deal found 4/23![Southwest logo]()
$277
This Alaska Airlines deal was found by Cheapflights users on 4/20. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
wt. 5/1210:39 am
ONT
- SEA
Nonstop2h 51m
Alaska Airlines
śr. 5/1310:25 am
SEA
- ONT
1 stop6h 52m
Alaska Airlines
Deal found 4/20![Alaska Airlines logo]()
$277
This Delta deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” 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.
ndz. 5/176:45 am
ONT
- SEA
Nonstop3h 04m
Delta
ndz. 5/248:25 am
SEA
- ONT
Nonstop2h 47m
Delta
Deal found 4/24![Delta logo]()
$257
This United Airlines deal was found by Cheapflights users on 4/23. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
wt. 5/121:30 pm
ONT
- SFO
Nonstop1h 30m
United Airlines
pt. 5/158:10 am
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 4/23![United Airlines logo]()
$283
This Southwest deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” 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.
pt. 7/245:15 am
ONT
- LAS
1 stop3h 25m
Southwest
ndz. 7/267:05 am
LAS
- ONT
1 stop5h 15m
Southwest
Deal found 4/24![Southwest logo]()
$289
This JetBlue deal was found by Cheapflights users on 4/20. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
wt. 6/210:41 pm
ONT
- JFK
Nonstop5h 29m
JetBlue
pt. 6/127:33 pm
JFK
- ONT
Nonstop6h 06m
JetBlue
Deal found 4/20![JetBlue logo]()
$322
This Delta deal was found by Cheapflights users on 4/20. 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.
śr. 5/1312:08 pm
ONT
- HOU
1 stop8h 18m
Delta
wt. 5/191:06 pm
HOU
- ONT
1 stop10h 42m
Delta
Deal found 4/20![Delta logo]()
$271
This Southwest deal was found by Cheapflights users on 4/23. 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.
pt. 6/126:30 am
ONT
- LAS
2 stops5h 05m
Southwest
pon. 6/1511:25 am
LAS
- ONT
1 stop3h 55m
Southwest
Deal found 4/23![Southwest logo]()
$294
This United Airlines deal was found by Cheapflights users on 4/23. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
pt. 5/1510:37 am
ONT
- SFO
Nonstop1h 30m
United Airlines
sob. 5/169:23 pm
SFO
- ONT
Nonstop1h 36m
United Airlines
Deal found 4/23![United Airlines logo]()
$294
This Alaska Airlines deal was found by Cheapflights users on 4/21. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
pt. 6/266:02 am
ONT
- SEA
Nonstop2h 42m
Alaska Airlines
sob. 6/2710:25 am
SEA
- ONT
Nonstop2h 44m
Alaska Airlines
Deal found 4/21![Alaska Airlines logo]()
$338
This Delta deal was found by Cheapflights users on 4/20. 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.
śr. 8/267:00 am
ONT
- HOU
1 stop7h 23m
Delta
pon. 8/311:00 pm
HOU
- ONT
2 stops12h 44m
Delta
Deal found 4/20![Delta logo]()
$288
This Southwest deal was found by Cheapflights users on 4/22. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
pt. 5/223:00 pm
ONT
- LAS
1 stop4h 20m
Southwest
wt. 5/265:45 am
LAS
- ONT
1 stop4h 40m
Southwest
Deal found 4/22![Southwest logo]()
$296
This United Airlines deal was found by Cheapflights users on 4/20. 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.
śr. 5/271:50 pm
ONT
- SEA
1 stop4h 57m
United Airlines
sob. 5/305:20 pm
SEA
- ONT
1 stop5h 30m
United Airlines
Deal found 4/20![United Airlines logo]()
$297
This JetBlue deal was found by Cheapflights users on 4/23. 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 JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
czw. 6/1111:54 pm
ONT
- JFK
Nonstop5h 24m
JetBlue
pt. 6/197:33 pm
JFK
- ONT
Nonstop6h 06m
JetBlue
Deal found 4/23![JetBlue logo]()
$372
This KAYAK deal was found by Cheapflights users on 4/23. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sob. 8/17:20 am
ONT
- DFW
Nonstop3h 02m
American Airlines
sob. 8/89:07 pm
DFW
- ONT
Nonstop3h 07m
American Airlines
Deal found 4/23![American Airlines logo]()
$484
This Alaska Airlines deal was found by Cheapflights users on 4/22. 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.
pon. 8/109:20 pm
ONT
- DFW
1 stop12h 39m
Alaska Airlines
pon. 8/178:45 pm
DFW
- ONT
1 stop16h 29m
Alaska Airlines
Deal found 4/22![Alaska Airlines logo]()
$364
This Delta deal was found by Cheapflights users on 4/21. 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.
czw. 6/41:29 pm
ONT
- DFW
1 stop5h 46m
Delta
pon. 6/83:34 pm
DFW
- ONT
2 stops10h 11m
Delta
Deal found 4/21![Delta logo]()
$310
Last-minute flights from Ontario to USADiscover last-minute flight deals from Ontario to USA. Data last updated Kwiecień 25, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to USA. Data last updated Kwiecień 25, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 4/23. 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.
pon. 5/1111:36 am
ONT
- LAS
Nonstop1h 11m
Frontier
sob. 5/231:59 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 4/23![Frontier logo]()
$81
This Kiwi.com deal was found by Cheapflights users on 4/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
wt. 5/124:39 pm
ONT
- LAS
Nonstop1h 10m
Frontier
wt. 5/192:32 pm
LAS
- ONT
Nonstop1h 12m
Frontier
Deal found 4/22![Frontier logo]()
$80
This Frontier deal was found by Cheapflights users on 4/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
wt. 5/124:39 pm
ONT
- LAS
Nonstop1h 10m
Frontier
sob. 5/166:22 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 4/21![Frontier logo]()
$92
This Super.com deal was found by Cheapflights users on 4/20. 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.
wt. 5/1210:50 am
ONT
- DEN
Nonstop2h 22m
Frontier
wt. 5/198:41 am
DEN
- ONT
Nonstop2h 24m
Frontier
Deal found 4/20![Frontier logo]()
$105
This Super.com deal was found by Cheapflights users on 4/23. 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.
śr. 5/134:39 pm
ONT
- LAS
Nonstop1h 10m
Frontier
sob. 5/166:22 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 4/23![Frontier logo]()
$91
This Super.com deal was found by Cheapflights users on 4/20. 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.
sob. 5/168:27 pm
ONT
- LAS
Nonstop1h 10m
Frontier
śr. 5/202:32 pm
LAS
- ONT
Nonstop1h 12m
Frontier
Deal found 4/20![Frontier logo]()
$90
This Kiwi.com deal was found by Cheapflights users on 4/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ndz. 5/174:04 pm
ONT
- LAS
Nonstop1h 10m
Frontier
wt. 5/192:32 pm
LAS
- ONT
Nonstop1h 12m
Frontier
Deal found 4/20![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 4/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sob. 5/2311:51 am
ONT
- LAS
Nonstop1h 11m
Frontier
wt. 5/267:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 4/20![Frontier logo]()
$75
This Cheapflightsfares deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” 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.
śr. 5/276:00 am
ONT
- DEN
Nonstop2h 22m
Frontier
wt. 6/28:41 am
DEN
- ONT
Nonstop2h 24m
Frontier
Deal found 4/24![Frontier logo]()
$103
This eDestinos deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
śr. 5/276:00 am
ONT
- DEN
Nonstop2h 22m
Frontier
sob. 6/69:06 pm
DEN
- ONT
1 stop11h 02m
Frontier
Deal found 4/24![Frontier logo]()
$107
This Frontier deal was found by Cheapflights users on 4/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
czw. 5/283:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
pt. 5/297:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 4/20![Frontier logo]()
$77
This Expedia deal was found by Cheapflights users on 4/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sob. 5/3011:51 am
ONT
- LAS
Nonstop1h 11m
Frontier
pon. 6/16:22 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 4/21![Frontier logo]()
$82
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 Kwiecień 25, 2026.
Search for one-way flight options from Ontario to USA. Find affordable one-way fares based on user searches. Data last updated Kwiecień 25, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ndz. 7/1911:43 am
ONT
- LAS
Nonstop1h 08m
Frontier
Deal found 4/20![Frontier logo]()
$46
This Super.com deal was found by Cheapflights users on 4/23. 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.
pt. 6/53:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
Deal found 4/23![Frontier logo]()
$47
This Frontier deal was found by Cheapflights users on 4/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
czw. 5/2811:51 am
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 4/20![Frontier logo]()
$48
This Kiwi.com deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” 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.
sob. 9/53:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 4/24![Frontier logo]()
$53
This Frontier deal was found by Cheapflights users on 4/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sob. 8/223:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 4/21![Frontier logo]()
$59
This Kiwi.com deal was found by Cheapflights users on 4/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sob. 5/168:27 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 4/23![Frontier logo]()
$62
This Travelocity deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” 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.
pon. 5/258:59 am
ONT
- SFO
Nonstop1h 39m
Frontier
Deal found 4/24![Frontier logo]()
$64
This Kiwi.com deal was found by Cheapflights users on 4/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
śr. 5/278:59 am
ONT
- LAS
1 stop28h 31m
Frontier
Deal found 4/23![Frontier logo]()
$65
This Frontier deal was found by Cheapflights users on 4/20. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sob. 6/208:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 4/20![Frontier logo]()
$65
This CheapOair deal was found by Cheapflights users on 4/21. 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.
pt. 5/293:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
Deal found 4/21![Frontier logo]()
$67
This Trip.com deal was found by Cheapflights users on 4/21. 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.
pt. 6/268:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 4/21![Frontier logo]()
$67
This Kiwi.com deal was found by Cheapflights users on 4/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
śr. 5/134:39 pm
ONT
- SFO
1 stop17h 57m
Frontier
Deal found 4/20![Frontier logo]()
$69
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 Kwiecień 25, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $74 (Super.com) |
One-way from | $46 (Kiwi.com) |
Popular in | April |
Cheapest in | January |
Average price | $387 |
Good round-trip deal | $157 or less |
Good one-way deal | $108 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 Kwiecień 25, 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
OntarioDenver
ONT - DEN
ONTDEN
Ontario
sob. 5/23
1:29 pm-7:15 pm
1 stop4h 46m
Denver Intl
pon. 5/25
5:30 am-8:53 am
1 stop4h 23m
$197
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
pt. 5/15
4:03 pm-6:52 pm
Nonstop2h 49m
Seattle/Tacoma Intl
wt. 5/19
9:22 pm-11:58 pm
Nonstop2h 36m
$207
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
pt. 5/15
6:00 am-8:52 am
Nonstop2h 52m
Seattle/Tacoma Intl
pon. 5/18
8:30 am-11:10 am
Nonstop2h 40m
$217
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
czw. 5/14
1:35 pm-4:35 pm
Nonstop3h 00m
Seattle/Tacoma Intl
pon. 5/18
9:45 am-12:35 pm
Nonstop2h 50m
$218
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
śr. 5/20
6:00 am-7:29 am
Nonstop1h 29m
San Francisco
śr. 5/20
9:23 pm-10:59 pm
Nonstop1h 36m
$225
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
czw. 6/4
6:00 am-7:25 am
Nonstop1h 25m
San Francisco
ndz. 6/7
10:40 am-12:12 pm
Nonstop1h 32m
$238
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
sob. 5/30
1:40 pm-3:05 pm
Nonstop1h 25m
San Francisco
pon. 6/1
9:00 pm-10:37 pm
Nonstop1h 37m
$248
OntarioHouston
ONT - HOU
ONTHOU
Ontario
śr. 9/23
12:00 pm-9:35 pm
1 stop7h 35m
Houston Hobby
wt. 9/29
10:05 am-6:01 pm
1 stop9h 56m
$257
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
ndz. 5/17
6:45 am-9:49 am
Nonstop3h 04m
Seattle/Tacoma Intl
ndz. 5/24
8:25 am-11:12 am
Nonstop2h 47m
$257
Quickest round-trip
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
czw. 5/14
5:30 am-6:35 am
Nonstop1h 05m
Las Vegas Harry Reid Intl
pt. 5/15
7:35 pm-8:40 pm
Nonstop1h 05m
$259
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-SEA
ONT-SFO
ONT-LAS
ONT-JFK
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-SEA
ONT-SFO
ONT-LAS
How far ahead should I book a flight from Ontario to USA?
Booking 29 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 month to book a flight from Ontario to USA?
Currently, August is the cheapest month in which you can book a flight from Ontario to USA (average of $269). Flying from Ontario to USA in March is currently the most expensive (average of $389). 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 Kwiecień 25, 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 34% on your trip compared to booking a flight in the afternoon.
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 April 18, 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. Friday 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?
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 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 Kwiecień 25, 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.
Comfort
8.0
Overall
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Overall
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Overall
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Overall
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Overall
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
Reviews
1 / 20
10.0
ExcellentWilliam Drew,Nov 2025
SJC - HNL
Comfort
8.0
Overall
8.0
Food
7.0
Boarding
8.1
Crew
8.6
Entertainment
7.5
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.
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 Kwiecień 25, 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 9 airlines flying from Ontario to USA
Discover the top 9 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 Kwiecień 25, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$27 | Average$141 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$37 | Average$201 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$68 | Average$382 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$78 | Average$242 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$97 | Average$372 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$98 | Average$223 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$99 | Average$367 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$155 | Average$325 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$183 | Average$410 | FlexibilityNo cancel fee | On-time71% |