$34+ Cheap flights from Ontario (ONT) to California
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 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Aug 10 — Aug 171
Round-trip
1 adult, Economy
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Cheapest flights from Ontario to CaliforniaExplore the most affordable flight options available from Ontario to California. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 11, 2026.
Explore the most affordable flight options available from Ontario to California. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 11, 2026.
This Super.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/148:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 8/179:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/10![Frontier logo]()
$92
This Frontier deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 8/78:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Wed 8/1211:15 am
SFO
- ONT
Nonstop1h 33m
Frontier
Deal found 7/9![Frontier logo]()
$93
This Frontier deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 8/218:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 8/249:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/9![Frontier logo]()
$94
This Frontier deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” 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 8/88:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Tue 8/1111:15 am
SFO
- ONT
Nonstop1h 33m
Frontier
Deal found 7/10![Frontier logo]()
$95
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Wed 8/193:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 8/227:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 7/8![Frontier logo]()
$96
This Frontier deal was found by Cheapflights users on 7/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/68:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Sat 8/89:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/11![Frontier logo]()
$96
This Frontier deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 9/129:49 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Tue 9/157:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 7/9![Frontier logo]()
$97
This Frontier deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 8/104:09 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Wed 8/122:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 7/9![Frontier logo]()
$98
This Frontier deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 8/243:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Wed 8/262:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 7/9![Frontier logo]()
$100
This Travelocity deal was found by Cheapflights users on 7/11. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/68:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Fri 8/79:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/11![Frontier logo]()
$100
This Super.com deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/109:12 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Sat 9/127:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 7/9![Frontier logo]()
$101
This Frontier deal was found by Cheapflights users on 7/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/88:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 8/109:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/8![Frontier logo]()
$101
Best flights from Ontario to CaliforniaDiscover carefully curated flight deals from Ontario to California that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 11, 2026.
Discover carefully curated flight deals from Ontario to California that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 11, 2026.
This United Airlines deal was found by Cheapflights users on 7/11. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/109:01 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Sat 9/124:40 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 7/11![United Airlines logo]()
$117
This Southwest deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” 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 8/189:40 am
ONT
- SFO
1 stop6h 20m
Southwest
Wed 8/266:50 am
SFO
- ONT
1 stop5h 50m
Southwest
Deal found 7/10![Southwest logo]()
$151
This Delta deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/256:00 am
ONT
- SMF
1 stop6h 18m
Delta
Fri 8/285:00 pm
SMF
- ONT
1 stop6h 34m
Delta
Deal found 7/9![Delta logo]()
$218
This Alaska Airlines deal was found by Cheapflights users on 7/8. 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.
Wed 8/194:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Mon 8/242:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 7/8![Alaska Airlines logo]()
$222
This United Airlines deal was found by Cheapflights users on 7/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/31:56 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Sun 9/66:30 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 7/8![United Airlines logo]()
$169
This Southwest deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 9/27:45 am
ONT
- SMF
1 stop4h 30m
Southwest
Wed 9/912:40 pm
SMF
- ONT
2 stops5h 45m
Southwest
Deal found 7/9![Southwest logo]()
$185
This Kiwi.com deal was found by Cheapflights users on 7/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/2411:52 am
ONT
- FAT
1 stop5h 49m
Multiple Airlines
Mon 7/273:31 pm
FAT
- ONT
2 stops21h 22m
Multiple Airlines
Deal found 7/6![Multiple Airlines logo]()
$376
This Southwest deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/275:15 am
ONT
- SFO
2 stops7h 55m
Southwest
Sat 8/295:00 am
SFO
- ONT
1 stop3h 45m
Southwest
Deal found 7/10![Southwest logo]()
$186
This United Airlines deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” 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 8/277:13 pm
ONT
- SMF
1 stop4h 44m
United Airlines
Sat 8/291:47 pm
SMF
- ONT
1 stop6h 14m
United Airlines
Deal found 7/10![United Airlines logo]()
$205
This Southwest deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/39:25 am
ONT
- SFO
2 stops5h 40m
Southwest
Tue 10/66:55 am
SFO
- ONT
2 stops8h 40m
Southwest
Deal found 7/9![Southwest logo]()
$191
This Delta deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 9/145:15 pm
ONT
- RNO
1 stop6h 20m
Delta
Thu 9/176:00 am
RNO
- ONT
1 stop6h 14m
Delta
Deal found 7/9![Delta logo]()
$235
This Southwest deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” 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 8/259:10 am
ONT
- LAS
1 stop3h 25m
Southwest
Wed 8/262:15 pm
LAS
- ONT
2 stops5h 50m
Southwest
Deal found 7/10![Southwest logo]()
$194
This United Airlines deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” 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 8/56:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Wed 8/510:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 7/10![United Airlines logo]()
$226
This Southwest deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:10 am
ONT
- SMF
Nonstop1h 25m
Southwest
Sat 8/294:40 pm
SMF
- ONT
Nonstop1h 20m
Southwest
Deal found 7/10![Southwest logo]()
$198
This Delta deal was found by Cheapflights users on 7/8. 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.
Sat 8/85:05 pm
ONT
- RNO
1 stop4h 52m
Delta
Fri 8/145:37 pm
RNO
- ONT
1 stop5h 57m
Delta
Deal found 7/8![Delta logo]()
$266
This Alaska Airlines deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” 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 10/176:02 am
ONT
- STS
2 stops13h 45m
Alaska Airlines
Wed 10/213:40 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 7/10![Alaska Airlines logo]()
$300
This Southwest deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/810:15 am
ONT
- SMF
1 stop3h 55m
Southwest
Tue 8/1812:55 pm
SMF
- ONT
2 stops5h 30m
Southwest
Deal found 7/7![Southwest logo]()
$198
This United Airlines deal was found by Cheapflights users on 7/8. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/279:00 am
ONT
- SMF
1 stop4h 28m
United Airlines
Tue 11/35:43 pm
SMF
- ONT
1 stop5h 10m
United Airlines
Deal found 7/8![United Airlines logo]()
$249
This Alaska Airlines deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 9/14:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Sat 9/52:14 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 7/9![Alaska Airlines logo]()
$307
This Southwest deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/172:40 pm
ONT
- LAS
1 stop4h 40m
Southwest
Sat 9/192:05 pm
LAS
- ONT
1 stop5h 40m
Southwest
Deal found 7/9![Southwest logo]()
$200
This Delta deal was found by Cheapflights users on 7/11. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/225:05 pm
ONT
- RNO
1 stop4h 52m
Delta
Mon 8/315:37 pm
RNO
- ONT
1 stop4h 46m
Delta
Deal found 7/11![Delta logo]()
$309
This Alaska Airlines deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” 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 9/174:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Mon 9/215:34 pm
STS
- ONT
1 stop5h 50m
Alaska Airlines
Deal found 7/10![Alaska Airlines logo]()
$330
This Southwest deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 8/191:50 pm
ONT
- OAK
1 stop6h 00m
Southwest
Sat 8/225:10 am
OAK
- ONT
2 stops6h 05m
Southwest
Deal found 7/9![Southwest logo]()
$205
This Southwest deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” 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 9/116:20 am
ONT
- STS
1 stop5h 55m
Southwest
Fri 9/112:55 pm
STS
- ONT
1 stop4h 30m
Southwest
Deal found 7/10![Southwest logo]()
$207
This Delta deal was found by Cheapflights users on 7/7. 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.
Sat 10/36:00 pm
ONT
- MFR
1 stop5h 17m
Delta
Mon 10/55:15 am
MFR
- ONT
1 stop6h 59m
Delta
Deal found 7/7![Delta logo]()
$337
This Alaska Airlines deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/257:12 am
ONT
- STS
2 stops14h 47m
Alaska Airlines
Sun 9/272:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 7/7![Alaska Airlines logo]()
$350
This United Airlines deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 7/306:00 am
ONT
- MFR
1 stop6h 04m
United Airlines
Sun 8/26:00 am
MFR
- ONT
1 stop6h 12m
United Airlines
Deal found 7/9![United Airlines logo]()
$337
This Delta deal was found by Cheapflights users on 7/7. 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.
Thu 10/16:00 pm
ONT
- MFR
1 stop5h 17m
Delta
Mon 10/126:05 am
MFR
- ONT
1 stop5h 11m
Delta
Deal found 7/7![Delta logo]()
$337
This Southwest deal was found by Cheapflights users on 7/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/121:10 pm
ONT
- SJC
2 stops7h 10m
Southwest
Sat 8/153:25 pm
SJC
- ONT
1 stop4h 40m
Southwest
Deal found 7/7![Southwest logo]()
$217
This Alaska Airlines deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” 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 9/1010:47 am
ONT
- STS
1 stop5h 09m
Alaska Airlines
Sat 9/122:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 7/10![Alaska Airlines logo]()
$350
Last-minute flights from Ontario to CaliforniaDiscover last-minute flight deals from Ontario to California. Data last updated July 11, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to California. Data last updated July 11, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/48:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Fri 8/79:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/9![Frontier logo]()
$92
This Frontier deal was found by Cheapflights users on 7/11. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/68:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Sat 8/89:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/11![Frontier logo]()
$96
This Travelocity deal was found by Cheapflights users on 7/11. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/68:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Fri 8/79:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/11![Frontier logo]()
$100
This Frontier deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 8/78:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Wed 8/1211:15 am
SFO
- ONT
Nonstop1h 33m
Frontier
Deal found 7/9![Frontier logo]()
$93
This Frontier deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” 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 8/88:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Tue 8/1111:15 am
SFO
- ONT
Nonstop1h 33m
Frontier
Deal found 7/10![Frontier logo]()
$95
This Super.com deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 8/84:09 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Mon 8/107:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 7/9![Frontier logo]()
$101
This Frontier deal was found by Cheapflights users on 7/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/88:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 8/109:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/8![Frontier logo]()
$101
This Frontier deal was found by Cheapflights users on 7/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/104:09 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Tue 8/112:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 7/8![Frontier logo]()
$97
This Frontier deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 8/104:09 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Wed 8/122:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 7/9![Frontier logo]()
$98
This Kiwi.com deal was found by Cheapflights users on 7/8. 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.
Wed 8/193:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 8/227:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 7/8![Frontier logo]()
$96
This Frontier deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 8/218:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 8/249:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/9![Frontier logo]()
$94
This Frontier deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 8/243:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Wed 8/262:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 7/9![Frontier logo]()
$100
One-way flights from Ontario to CaliforniaSearch for one-way flight options from Ontario to California. Find affordable one-way fares based on user searches. Data last updated July 11, 2026.
Search for one-way flight options from Ontario to California. Find affordable one-way fares based on user searches. Data last updated July 11, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/58:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/10![Frontier logo]()
$34
This Booking.com deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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.
Mon 8/178:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/9![Frontier logo]()
$35
This Frontier deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” 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 8/138:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/10![Frontier logo]()
$36
This Trip.com deal was found by Cheapflights users on 7/10. Clicking the “Pick Dates” 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.
Mon 9/2811:38 am
ONT
- SFO
Nonstop1h 34m
Frontier
Deal found 7/10![Frontier logo]()
$37
This Frontier deal was found by Cheapflights users on 7/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/511:38 am
ONT
- SFO
Nonstop1h 34m
Frontier
Deal found 7/8![Frontier logo]()
$43
This Frontier deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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.
Sun 9/68:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/9![Frontier logo]()
$44
This Frontier deal was found by Cheapflights users on 7/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/53:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 7/8![Frontier logo]()
$45
This Frontier deal was found by Cheapflights users on 7/8. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/159:49 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 7/8![Frontier logo]()
$46
This Booking.com deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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.
Tue 8/111:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 7/9![Frontier logo]()
$47
This Super.com deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 9/23:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 7/9![Frontier logo]()
$48
This Frontier deal was found by Cheapflights users on 7/9. Clicking the “Pick Dates” 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 9/112:58 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 7/9![Frontier logo]()
$49
This Southwest deal was found by Cheapflights users on 7/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/58:35 am
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 7/6![Southwest logo]()
$50
Find flight deals from Ontario to California
Keep the following information in mind while searching for Ontario to California flight deals. Data was last updated July 11, 2026.
Round-trip from | $92 (Super.com) |
|---|---|
One-way from | $34 (Kiwi.com) |
Good round-trip deal | $163 or less |
Good one-way deal | $95 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to California 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 July 11, 2026.
Use the filters below to find and compare flights from Ontario to California that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Thu 9/10
9:01 am-10:30 am
Nonstop1h 29m
San Francisco
Sat 9/12
4:40 pm-6:11 pm
Nonstop1h 31m
$117
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Tue 8/18
9:40 am-4:00 pm
1 stop6h 20m
San Francisco
Wed 8/26
6:50 am-12:40 pm
1 stop5h 50m
$151
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Thu 9/3
1:56 pm-3:25 pm
Nonstop1h 29m
San Francisco
Sun 9/6
6:30 pm-8:01 pm
Nonstop1h 31m
$169
OntarioSacramento
ONT - SMF
ONTSMF
Ontario
Wed 9/2
7:45 am-12:15 pm
1 stop4h 30m
Sacramento Intl
Wed 9/9
12:40 pm-6:25 pm
2 stops5h 45m
$185
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Thu 8/27
5:15 am-1:10 pm
2 stops7h 55m
San Francisco
Sat 8/29
5:00 am-8:45 am
1 stop3h 45m
$186
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Sat 10/3
9:25 am-3:05 pm
2 stops5h 40m
San Francisco
Tue 10/6
6:55 am-3:35 pm
2 stops8h 40m
$191
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Tue 8/25
9:10 am-12:35 pm
1 stop3h 25m
Las Vegas Harry Reid Intl
Wed 8/26
2:15 pm-8:05 pm
2 stops5h 50m
$194
Quickest round-trip
OntarioSacramento
ONT - SMF
ONTSMF
Ontario
Thu 8/27
6:10 am-7:35 am
Nonstop1h 25m
Sacramento Intl
Sat 8/29
4:40 pm-6:00 pm
Nonstop1h 20m
$198
OntarioSacramento
ONT - SMF
ONTSMF
Ontario
Sat 8/8
10:15 am-2:10 pm
1 stop3h 55m
Sacramento Intl
Tue 8/18
12:55 pm-6:25 pm
2 stops5h 30m
$198
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Thu 9/17
2:40 pm-7:20 pm
1 stop4h 40m
Las Vegas Harry Reid Intl
Sat 9/19
2:05 pm-7:45 pm
1 stop5h 40m
$200
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Ontario to California
Have a flexible travel schedule? Discover the best time to fly to California from Ontario with our price prediction graph.
ONT-SFO
ONT-LAS
ONT-SJC
ONT-SMF
ONT-STS
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 California
ONT-USCA
ONT-SFO
ONT-LAS
ONT-SJC
ONT-SMF
What is the cheapest month to book a flight from Ontario to California?
Currently, April is the cheapest month in which you can book a flight from Ontario to California (average of $28). Flying from Ontario to California in October is currently the most expensive (average of $368). 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 CA?
Find hourly flight availability from Ontario to California. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 11, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 21% on flights from Ontario to California by exploring options for tickets in the evening.
How far ahead should I book a flight from Ontario to California?
The price you pay for your flight from Ontario to California may vary depending on when you book. For the best chance of a lower fare, look to book 22 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest day to fly from Ontario to California?
Use this chart to determine the cheapest time to fly round-trip from Ontario to California. Price data was last updated on July 4, 2026.
Travelers seeking maximum savings on their Ontario to California flight should consider departing on Saturday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing California
Get insights into the airlines that provide service to California. 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 California. Reviews last updated July 11, 2026.
Get a feel of what it's like to fly with Alaska Airlines,Southwest, andUnited Airlines from Ontario to California by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Entertainment
7.0
Food
7.1
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Related info for your journey
Find useful and relevant information for your journey from Ontario to California. 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
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Alternative routes for Ontario to California
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to California by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to California by cabin class
Find flights from Ontario to California, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and California flights
Browse other Ontario and California flight options. Last updated on July 11, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to California flights
Consider these flights traveling from Ontario to California.
Top 5 airlines flying from Ontario to California
Discover the top 5 airlines that operate flights from Ontario to California. 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 July 11, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$133 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$78 | Average$167 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$91 | Average$248 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$125 | Average$323 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$153 | Average$188 | FlexibilityNo cancel fee | On-time62% |