$34+ 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 7/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Jul 8 — Jul 151
Round-trip
1 adult, Economy
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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 Jun 8, 2026.
Explore the most affordable flight options available from Ontario to USA. Find the lowest fares from popular airlines and budget airlines, with prices last updated on Jun 8, 2026.
This CheapOair deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 8/41:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Khamis 8/62:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/3![Frontier logo]()
$74
This Frontier deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 7/281:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Khamis 7/302:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/3![Frontier logo]()
$75
This Super.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 8/111:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Ahad 8/167:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/4![Frontier logo]()
$76
This Frontier deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 7/291:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sabtu 8/17:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/4![Frontier logo]()
$77
This Super.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 7/13:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sabtu 7/41:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/7![Frontier logo]()
$78
This Super.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Khamis 9/1011:16 am
ONT
- LAS
Nonstop1h 11m
Frontier
Isnin 9/147:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/7![Frontier logo]()
$79
This Frontier deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sabtu 9/122:58 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Isnin 9/147:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/7![Frontier logo]()
$80
This Trip.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Isnin 9/711:43 am
ONT
- LAS
Nonstop1h 08m
Frontier
Selasa 9/86:40 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/7![Frontier logo]()
$81
This CheapOair deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 6/303:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Jumaat 7/31:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/4![Frontier logo]()
$82
This Frontier deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Khamis 8/203:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sabtu 9/123:00 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 6/3![Frontier logo]()
$84
This Super.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Khamis 8/2711:43 am
ONT
- LAS
Nonstop1h 08m
Frontier
Sabtu 8/291:56 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/4![Frontier logo]()
$85
This Super.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Khamis 8/203:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Ahad 8/236:40 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/4![Frontier logo]()
$86
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 Jun 8, 2026.
Discover carefully curated flight deals from Ontario to USA that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated Jun 8, 2026.
This Southwest deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 7/16:35 pm
ONT
- LAS
Nonstop1h 05m
Southwest
Rabu 7/19:45 pm
LAS
- ONT
Nonstop1h 00m
Southwest
Deal found 6/5![Southwest logo]()
$157
This United Airlines deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sabtu 10/108:00 am
ONT
- SFO
Nonstop1h 27m
United Airlines
Selasa 10/131:40 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 6/5![United Airlines logo]()
$229
This Alaska Airlines deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 8/266:05 pm
ONT
- SEA
1 stop4h 34m
Alaska Airlines
Ahad 9/133:51 pm
SEA
- ONT
1 stop4h 33m
Alaska Airlines
Deal found 6/7![Alaska Airlines logo]()
$267
This Delta deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Ahad 9/2011:44 am
ONT
- SEA
Nonstop2h 56m
Delta
Rabu 9/232:30 pm
SEA
- ONT
Nonstop2h 50m
Delta
Deal found 6/8![Delta logo]()
$307
This Southwest deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 7/77:20 pm
ONT
- DEN
1 stop4h 00m
Southwest
Rabu 7/156:15 am
DEN
- ONT
1 stop4h 00m
Southwest
Deal found 6/5![Southwest logo]()
$165
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 7/215:30 am
ONT
- LAS
Nonstop1h 05m
Southwest
Rabu 7/225:55 am
LAS
- ONT
1 stop3h 20m
Southwest
Deal found 6/8![Southwest logo]()
$167
This JetBlue deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Isnin 7/1311:51 pm
ONT
- JFK
Nonstop5h 22m
JetBlue
Rabu 7/157:29 pm
JFK
- ONT
Nonstop6h 06m
JetBlue
Deal found 6/7![JetBlue logo]()
$383
This Southwest deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 8/48:35 am
ONT
- SFO
2 stops7h 25m
Southwest
Selasa 8/116:00 am
SFO
- ONT
2 stops10h 05m
Southwest
Deal found 6/4![Southwest logo]()
$167
This United Airlines deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Khamis 8/276:00 am
ONT
- LAS
1 stop4h 22m
United Airlines
Jumaat 8/281:34 pm
LAS
- ONT
1 stop4h 37m
United Airlines
Deal found 6/5![United Airlines logo]()
$245
This Alaska Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 8/45:26 pm
ONT
- HNL
1 stop9h 46m
Multiple Airlines
Isnin 8/1011:20 pm
HNL
- ONT
1 stop10h 49m
Multiple Airlines
Deal found 6/8![Multiple Airlines logo]()
$504
This United Airlines deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Ahad 8/238:50 am
ONT
- SEA
1 stop7h 24m
United Airlines
Khamis 8/271:16 pm
SEA
- ONT
1 stop4h 55m
United Airlines
Deal found 6/5![United Airlines logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 9/86:02 am
ONT
- SEA
Nonstop2h 43m
Alaska Airlines
Selasa 9/811:43 am
SEA
- ONT
1 stop4h 27m
Alaska Airlines
Deal found 6/3![Alaska Airlines logo]()
$302
This Southwest deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Jumaat 7/38:45 pm
ONT
- SFO
1 stop4h 05m
Southwest
Selasa 7/76:00 am
SFO
- ONT
1 stop5h 30m
Southwest
Deal found 6/4![Southwest logo]()
$238
This Delta deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 6/306:20 am
ONT
- SEA
Nonstop2h 57m
Delta
Khamis 7/95:30 am
SEA
- ONT
1 stop6h 40m
Delta
Deal found 6/7![Delta logo]()
$337
This Southwest deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Khamis 8/136:10 am
ONT
- LAS
2 stops5h 15m
Southwest
Ahad 8/168:00 am
LAS
- ONT
1 stop3h 35m
Southwest
Deal found 6/4![Southwest logo]()
$250
This Delta deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Khamis 8/201:06 pm
ONT
- SEA
1 stop5h 38m
Delta
Ahad 8/235:45 am
SEA
- ONT
1 stop6h 31m
Delta
Deal found 6/7![Delta logo]()
$337
This United Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Khamis 7/306:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Isnin 8/39:00 pm
SFO
- ONT
Nonstop1h 37m
United Airlines
Deal found 6/4![United Airlines logo]()
$307
This Alaska Airlines deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 10/67:23 am
ONT
- JFK
1 stop9h 02m
Alaska Airlines
Jumaat 10/165:20 pm
JFK
- ONT
1 stop9h 33m
Alaska Airlines
Deal found 6/3![Alaska Airlines logo]()
$356
This JetBlue deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Isnin 7/2011:51 pm
ONT
- JFK
Nonstop5h 22m
JetBlue
Jumaat 7/247:30 pm
JFK
- ONT
Nonstop6h 06m
JetBlue
Deal found 6/7![JetBlue logo]()
$401
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 7/18:25 pm
ONT
- LAS
Nonstop1h 05m
Southwest
Jumaat 7/34:45 pm
LAS
- ONT
2 stops4h 45m
Southwest
Deal found 6/8![Southwest logo]()
$253
This United Airlines deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Khamis 7/231:50 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
Sabtu 7/2510:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 6/7![United Airlines logo]()
$315
This Delta deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 7/225:10 pm
ONT
- SEA
1 stop4h 50m
Delta
Khamis 8/67:15 am
SEA
- ONT
1 stop5h 01m
Delta
Deal found 6/7![Delta logo]()
$347
This Alaska Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 12/26:00 am
ONT
- EWR
1 stop9h 56m
Alaska Airlines
Ahad 12/67:17 am
EWR
- ONT
1 stop10h 30m
Alaska Airlines
Deal found 6/4![Alaska Airlines logo]()
$369
This Southwest deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sabtu 7/116:30 pm
ONT
- SFO
1 stop6h 05m
Southwest
Isnin 7/136:45 pm
SFO
- ONT
1 stop5h 25m
Southwest
Deal found 6/5![Southwest logo]()
$257
This JetBlue deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Jumaat 7/1711:51 pm
ONT
- JFK
Nonstop5h 22m
JetBlue
Jumaat 7/247:30 pm
JFK
- ONT
Nonstop6h 06m
JetBlue
Deal found 6/7![JetBlue logo]()
$419
This United Airlines deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sabtu 8/16:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Isnin 8/310:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 6/7![United Airlines logo]()
$315
This Delta deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 10/2110:59 pm
ONT
- EWR
1 stop7h 37m
Delta
Sabtu 10/246:55 pm
EWR
- ONT
1 stop7h 53m
Delta
Deal found 6/5![Delta logo]()
$379
This Southwest deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Jumaat 9/115:40 am
ONT
- SFO
1 stop3h 40m
Southwest
Sabtu 9/125:00 am
SFO
- ONT
1 stop3h 45m
Southwest
Deal found 6/3![Southwest logo]()
$260
This JetBlue deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure JetBlue is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 7/2211:51 pm
ONT
- JFK
Nonstop5h 22m
JetBlue
Selasa 7/287:29 pm
JFK
- ONT
Nonstop6h 06m
JetBlue
Deal found 6/6![JetBlue logo]()
$422
This Alaska Airlines deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 7/79:11 am
ONT
- HNL
Nonstop5h 58m
Multiple Airlines
Khamis 7/95:42 pm
HNL
- ONT
2 stops13h 14m
Multiple Airlines
Deal found 6/4![Multiple Airlines logo]()
$548
Last-minute flights from Ontario to USADiscover last-minute flight deals from Ontario to USA. Data last updated Jun 8, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to USA. Data last updated Jun 8, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 6/303:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Jumaat 7/31:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/4![Frontier logo]()
$82
This Super.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 7/13:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Jumaat 7/36:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/8![Frontier logo]()
$76
This Super.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 7/13:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sabtu 7/41:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/7![Frontier logo]()
$78
This Super.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Jumaat 7/33:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sabtu 7/46:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/7![Frontier logo]()
$79
This Super.com deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Jumaat 7/311:58 am
ONT
- LAS
Nonstop1h 08m
Frontier
Jumaat 7/36:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/5![Frontier logo]()
$86
This Cheapflightsfares deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 7/76:00 am
ONT
- DEN
Nonstop2h 24m
Frontier
Selasa 9/2912:32 pm
DEN
- ONT
Nonstop2h 25m
Frontier
Deal found 6/5![Frontier logo]()
$124
This Frontier deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 7/281:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sabtu 8/12:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/3![Frontier logo]()
$75
This Frontier deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 7/291:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sabtu 8/17:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/4![Frontier logo]()
$77
This Frontier deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 7/293:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Jumaat 7/317:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/7![Frontier logo]()
$88
This Cheapflightsfares deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 7/296:00 am
ONT
- DEN
Nonstop2h 24m
Frontier
Khamis 7/308:45 am
DEN
- ONT
Nonstop2h 19m
Frontier
Deal found 6/5![Frontier logo]()
$125
This Super.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Jumaat 7/313:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Rabu 8/52:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/7![Frontier logo]()
$87
This Kiwi.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Jumaat 7/3111:52 am
ONT
- LAS
Nonstop1h 10m
Frontier
Ahad 8/27:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/4![Frontier logo]()
$90
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 Jun 8, 2026.
Search for one-way flight options from Ontario to USA. Find affordable one-way fares based on user searches. Data last updated Jun 8, 2026.
This Super.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Jumaat 7/33:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/4![Frontier logo]()
$34
This Trip.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 7/293:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/4![Frontier logo]()
$35
This Kiwi.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Selasa 6/301:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/8![Frontier logo]()
$37
This Super.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sabtu 9/53:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/8![Frontier logo]()
$38
This Frontier deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Khamis 9/311:43 am
ONT
- LAS
Nonstop1h 08m
Frontier
Deal found 6/4![Frontier logo]()
$43
This Frontier deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sabtu 8/13:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/7![Frontier logo]()
$44
This Frontier deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Jumaat 8/213:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/4![Frontier logo]()
$45
This Trip.com deal was found by Cheapflights users on 6/4. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Isnin 8/33:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/4![Frontier logo]()
$46
This CheapOair deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Rabu 7/221:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/6![Frontier logo]()
$47
This Super.com deal was found by Cheapflights users on 6/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Isnin 6/228:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 6/3![Frontier logo]()
$63
This Frontier deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Isnin 6/298:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 6/7![Frontier logo]()
$64
This Frontier deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Isnin 8/248:33 pm
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 6/5![Frontier logo]()
$66
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 Jun 8, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $74 (CheapOair) |
One-way from | $34 (Super.com) |
Popular in | May |
Cheapest in | January |
Average price | $393 |
Good round-trip deal | $162 or less |
Good one-way deal | $118 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 Jun 8, 2026.
Use the filters below to find and compare flights from Ontario to the United States that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Rabu 7/1
6:35 pm-7:40 pm
Nonstop1h 05m
Las Vegas Harry Reid Intl
Rabu 7/1
9:45 pm-10:45 pm
Nonstop1h 00m
$157
OntarioDenver
ONT - DEN
ONTDEN
Ontario
Selasa 7/7
7:20 pm-12:20 am
1 stop4h 00m
Denver Intl
Rabu 7/15
6:15 am-9:15 am
1 stop4h 00m
$165
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Selasa 7/21
5:30 am-6:35 am
Nonstop1h 05m
Las Vegas Harry Reid Intl
Rabu 7/22
5:55 am-9:15 am
1 stop3h 20m
$167
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Selasa 8/4
8:35 am-4:00 pm
2 stops7h 25m
San Francisco
Selasa 8/11
6:00 am-4:05 pm
2 stops10h 05m
$167
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Sabtu 10/10
8:00 am-9:27 am
Nonstop1h 27m
San Francisco
Selasa 10/13
1:40 pm-3:11 pm
Nonstop1h 31m
$229
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Jumaat 7/3
8:45 pm-12:50 am
1 stop4h 05m
San Francisco
Selasa 7/7
6:00 am-11:30 am
1 stop5h 30m
$238
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Khamis 8/27
6:00 am-10:22 am
1 stop4h 22m
Las Vegas Harry Reid Intl
Jumaat 8/28
1:34 pm-6:11 pm
1 stop4h 37m
$245
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Khamis 8/13
6:10 am-11:25 am
2 stops5h 15m
Las Vegas Harry Reid Intl
Ahad 8/16
8:00 am-11:35 am
1 stop3h 35m
$250
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Rabu 7/1
8:25 pm-9:30 pm
Nonstop1h 05m
Las Vegas Harry Reid Intl
Jumaat 7/3
4:45 pm-9:30 pm
2 stops4h 45m
$253
OntarioSeattle
ONT - SEA
ONTSEA
Ontario
Ahad 8/23
8:50 am-4:14 pm
1 stop7h 24m
Seattle/Tacoma Intl
Khamis 8/27
1:16 pm-6:11 pm
1 stop4h 55m
$257
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-SFO
ONT-DEN
ONT-JFK
ONT-LAS
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-SFO
ONT-DEN
ONT-JFK
ONT-LAS
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 $275). Flying from Ontario to USA in March is currently the most expensive (average of $393). 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 Jun 8, 2026.
A simple way to save on the total cost of your ticket is to fly from Ontario to USA in the evening. If you’re flexible enough to do this you can expect to save up to 24% on your trip compared to booking a flight in the afternoon.
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 4% of flights being delayed.
How far ahead should I book a flight from Ontario to USA?
Booking 37 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 June 8, 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. Tuesday evenings 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 Jun 8, 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.
Comfort
7.8
Crew
8.5
Entertainment
7.0
Boarding
8.1
Food
7.1
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Comfort
7.8
Crew
8.5
Entertainment
7.0
Boarding
8.1
Food
7.1
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Comfort
7.8
Crew
8.5
Entertainment
7.0
Boarding
8.1
Food
7.1
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Comfort
7.8
Crew
8.5
Entertainment
7.0
Boarding
8.1
Food
7.1
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Comfort
7.8
Crew
8.5
Entertainment
7.0
Boarding
8.1
Food
7.1
Overall
7.9
Reviews
1 / 20
10.0
ExcellentFranzi,Mar 2026
SFO - PDX
Comfort
7.8
Crew
8.5
Entertainment
7.0
Boarding
8.1
Food
7.1
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
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 Jun 8, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to USA flights
Consider these flights traveling from Ontario to USA.
Fly to USA regions
Consider these flights traveling to USA regions.
Top 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 Jun 8, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$49 | Average$216 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$78 | Average$367 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$79 | Average$379 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$98 | Average$217 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$99 | Average$367 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$103 | Average$391 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$153 | Average$329 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$179 | Average$414 | FlexibilityNo cancel fee | On-time71% |