$37+ 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 7/6. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
May 12 — May 191
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 April 12, 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 April 12, 2026.
This Super.com deal was found by Cheapflights users on 4/8. 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.
Tue 6/163:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Fri 6/191:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 4/8![Frontier logo]()
$66
This Super.com deal was found by Cheapflights users on 4/7. 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.
Sun 6/73:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
Sat 6/131:56 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 4/7![Frontier logo]()
$68
This Kiwi.com deal was found by Cheapflights users on 4/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/283:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
Sat 5/307:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 4/9![Frontier logo]()
$74
This CheapOair deal was found by Cheapflights users on 4/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/309:20 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Fri 5/17:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 4/7![Frontier logo]()
$75
This Frontier deal was found by Cheapflights users on 4/7. 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.
Mon 6/1511:43 am
ONT
- LAS
Nonstop1h 08m
Frontier
Thu 6/186:40 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 4/7![Frontier logo]()
$76
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/283:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
Fri 5/297:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 4/7![Frontier logo]()
$77
This Trip.com deal was found by Cheapflights users on 4/7. 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.
Wed 6/101:27 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Wed 6/176:40 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 4/7![Frontier logo]()
$78
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/211:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Sat 5/25:41 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 4/7![Frontier logo]()
$79
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/113:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sun 6/146:40 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 4/7![Frontier logo]()
$81
This Super.com deal was found by Cheapflights users on 4/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/171:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Wed 6/241:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 4/11![Frontier logo]()
$84
This Frontier deal was found by Cheapflights users on 4/7. 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.
Wed 6/173:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Fri 6/196:40 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 4/7![Frontier logo]()
$85
This Super.com deal was found by Cheapflights users on 4/8. 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.
Thu 7/23:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sun 7/51:56 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 4/8![Frontier logo]()
$86
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 April 12, 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 April 12, 2026.
This Alaska Airlines deal was found by Cheapflights users on 4/7. 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.
Thu 5/712:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Sat 5/910:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$137
This Southwest deal was found by Cheapflights users on 4/7. 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.
Mon 5/43:55 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Wed 5/612:30 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 4/7![Southwest logo]()
$147
This United Airlines deal was found by Cheapflights users on 4/11. 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.
Wed 5/66:00 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Tue 5/128:10 am
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 4/11![United Airlines logo]()
$207
This Alaska Airlines deal was found by Cheapflights users on 4/7. 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 5/112:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Mon 5/410:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$157
This Southwest deal was found by Cheapflights users on 4/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/115:05 pm
ONT
- SJC
1 stop5h 20m
Southwest
Wed 5/136:05 am
SJC
- ONT
1 stop5h 50m
Southwest
Deal found 4/11![Southwest logo]()
$157
This Delta deal was found by Cheapflights users on 4/11. 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.
Fri 5/155:50 pm
ONT
- MFR
1 stop6h 05m
Delta
Wed 5/206:15 am
MFR
- ONT
1 stop4h 57m
Delta
Deal found 4/11![Delta logo]()
$321
This Southwest deal was found by Cheapflights users on 4/9. 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.
Mon 5/43:00 pm
ONT
- SFO
2 stops7h 10m
Southwest
Wed 5/68:55 am
SFO
- ONT
2 stops6h 10m
Southwest
Deal found 4/9![Southwest logo]()
$184
This Alaska Airlines deal was found by Cheapflights users on 4/8. 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.
Fri 5/223:35 pm
ONT
- STS
Nonstop1h 29m
Alaska Airlines
Sat 5/235:44 pm
STS
- ONT
Nonstop1h 24m
Alaska Airlines
Deal found 4/8![Alaska Airlines logo]()
$197
This United Airlines deal was found by Cheapflights users on 4/11. 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.
Sat 5/26:59 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Tue 5/124:15 pm
SFO
- ONT
Nonstop1h 37m
United Airlines
Deal found 4/11![United Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 4/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/612:40 pm
ONT
- SMF
2 stops5h 35m
Southwest
Wed 5/67:30 pm
SMF
- ONT
Nonstop1h 20m
Southwest
Deal found 4/11![Southwest logo]()
$204
This Alaska Airlines deal was found by Cheapflights users on 4/10. 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.
Fri 5/112:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Sun 5/310:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Deal found 4/10![Alaska Airlines logo]()
$207
This United Airlines deal was found by Cheapflights users on 4/9. 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.
Sat 5/96:59 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Mon 5/118:10 am
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 4/9![United Airlines logo]()
$247
This Alaska Airlines deal was found by Cheapflights users on 4/7. 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.
Thu 7/96:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sun 7/124:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 4/7![Alaska Airlines logo]()
$217
This Southwest deal was found by Cheapflights users on 4/7. 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.
Thu 5/73:35 pm
ONT
- OAK
Nonstop1h 20m
Southwest
Thu 5/146:05 am
OAK
- ONT
Nonstop1h 20m
Southwest
Deal found 4/7![Southwest logo]()
$221
This Delta deal was found by Cheapflights users on 4/11. 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.
Tue 5/121:29 pm
ONT
- RNO
2 stops9h 58m
Delta
Thu 5/146:00 am
RNO
- ONT
1 stop6h 19m
Delta
Deal found 4/11![Delta logo]()
$322
This Southwest deal was found by Cheapflights users on 4/7. 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.
Tue 5/1210:40 am
ONT
- OAK
2 stops7h 35m
Southwest
Wed 5/1310:15 am
OAK
- ONT
1 stop4h 50m
Southwest
Deal found 4/7![Southwest logo]()
$222
This Alaska Airlines deal was found by Cheapflights users on 4/9. 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.
Thu 5/213:35 pm
ONT
- STS
Nonstop1h 29m
Alaska Airlines
Sat 5/235:44 pm
STS
- ONT
Nonstop1h 24m
Alaska Airlines
Deal found 4/9![Alaska Airlines logo]()
$227
This United Airlines deal was found by Cheapflights users on 4/10. 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.
Tue 5/121:30 pm
ONT
- FAT
1 stop4h 32m
United Airlines
Tue 5/196:05 am
FAT
- ONT
1 stop3h 36m
United Airlines
Deal found 4/10![United Airlines logo]()
$287
This Delta deal was found by Cheapflights users on 4/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/201:29 pm
ONT
- RNO
2 stops9h 58m
Delta
Sun 5/246:00 am
RNO
- ONT
1 stop6h 19m
Delta
Deal found 4/10![Delta logo]()
$322
This Southwest deal was found by Cheapflights users on 4/10. 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.
Sat 5/26:20 pm
ONT
- SMF
Nonstop1h 25m
Southwest
Sat 5/3010:50 am
SMF
- ONT
1 stop3h 20m
Southwest
Deal found 4/10![Southwest logo]()
$223
This Alaska Airlines deal was found by Cheapflights users on 4/10. 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 4/3012:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Sat 5/210:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Deal found 4/10![Alaska Airlines logo]()
$237
This United Airlines deal was found by Cheapflights users on 4/7. 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.
Tue 4/286:00 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Fri 5/88:10 am
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 4/7![United Airlines logo]()
$288
This Southwest deal was found by Cheapflights users on 4/9. 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.
Mon 5/48:25 pm
ONT
- OAK
Nonstop1h 20m
Southwest
Tue 5/511:10 am
OAK
- ONT
2 stops7h 45m
Southwest
Deal found 4/9![Southwest logo]()
$224
This Delta deal was found by Cheapflights users on 4/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/25:59 pm
ONT
- MFR
1 stop4h 40m
Delta
Sun 5/36:10 am
MFR
- ONT
1 stop5h 03m
Delta
Deal found 4/12![Delta logo]()
$328
This United Airlines deal was found by Cheapflights users on 4/11. 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 8/207:13 pm
ONT
- RNO
1 stop4h 37m
United Airlines
Sun 8/236:39 pm
RNO
- ONT
1 stop4h 19m
United Airlines
Deal found 4/11![United Airlines logo]()
$295
This Alaska Airlines deal was found by Cheapflights users on 4/10. 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 5/97:00 am
ONT
- STS
1 stop26h 09m
Alaska Airlines
Tue 5/1210:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Deal found 4/10![Alaska Airlines logo]()
$250
This Southwest deal was found by Cheapflights users on 4/10. 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.
Sat 5/166:45 am
ONT
- SMF
Nonstop1h 25m
Southwest
Sat 5/1612:40 pm
SMF
- ONT
2 stops7h 35m
Southwest
Deal found 4/10![Southwest logo]()
$228
This Delta deal was found by Cheapflights users on 4/11. 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.
Fri 5/155:50 pm
ONT
- MFR
1 stop6h 05m
Delta
Thu 5/2112:21 pm
MFR
- ONT
1 stop4h 49m
Delta
Deal found 4/11![Delta logo]()
$354
This United Airlines deal was found by Cheapflights users on 4/9. 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.
Sat 5/96:00 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Sun 5/1010:52 am
SFO
- ONT
Nonstop1h 30m
United Airlines
Deal found 4/9![United Airlines logo]()
$298
This Southwest deal was found by Cheapflights users on 4/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/95:40 am
ONT
- SMF
2 stops6h 20m
Southwest
Mon 5/118:35 pm
SMF
- ONT
Nonstop1h 25m
Southwest
Deal found 4/11![Southwest logo]()
$228
Last-minute flights from Ontario to CaliforniaDiscover last-minute flight deals from Ontario to California. Data last updated April 12, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to California. Data last updated April 12, 2026 and is based on user searches.
This CheapOair deal was found by Cheapflights users on 4/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/309:20 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Fri 5/17:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 4/7![Frontier logo]()
$75
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/211:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Sat 5/25:41 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 4/7![Frontier logo]()
$79
This Frontier deal was found by Cheapflights users on 4/8. 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 5/27:44 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Tue 5/510:00 am
LAS
- ONT
1 stop9h 11m
Frontier
Deal found 4/8![Frontier logo]()
$98
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/312:59 am
ONT
- LAS
1 stop6h 05m
Frontier
Mon 5/46:59 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 4/7![Frontier logo]()
$95
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/54:39 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Mon 5/1112:29 am
LAS
- ONT
1 stop9h 36m
Frontier
Deal found 4/7![Frontier logo]()
$92
This Frontier deal was found by Cheapflights users on 4/10. 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.
Tue 5/54:39 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Sat 6/206:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 4/10![Frontier logo]()
$93
This Southwest deal was found by Cheapflights users on 4/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/55:45 am
ONT
- SJC
Nonstop1h 15m
Southwest
Wed 5/612:30 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 4/11![Southwest logo]()
$97
This Kiwi.com deal was found by Cheapflights users on 4/10. 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 5/1310:50 am
ONT
- LAS
1 stop9h 13m
Frontier
Thu 5/141:59 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 4/10![Frontier logo]()
$96
This Southwest deal was found by Cheapflights users on 4/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:15 am
ONT
- LAS
Nonstop1h 10m
Southwest
Tue 6/21:50 pm
LAS
- ONT
Nonstop1h 05m
Southwest
Deal found 4/11![Southwest logo]()
$97
This Kiwi.com deal was found by Cheapflights users on 4/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/283:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
Sat 5/307:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 4/9![Frontier logo]()
$74
This Flightnetwork deal was found by Cheapflights users on 4/8. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/283:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
Mon 6/11:59 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 4/8![Frontier logo]()
$76
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/283:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
Fri 5/297:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 4/7![Frontier logo]()
$77
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 April 12, 2026.
Search for one-way flight options from Ontario to California. Find affordable one-way fares based on user searches. Data last updated April 12, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/63:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 4/7![Frontier logo]()
$37
This Booking.com deal was found by Cheapflights users on 4/10. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/38:19 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 4/10![Frontier logo]()
$38
This CheapOair deal was found by Cheapflights users on 4/7. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/264:39 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 4/7![Frontier logo]()
$47
This Booking.com deal was found by Cheapflights users on 4/7. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/303:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
Deal found 4/7![Frontier logo]()
$48
This Southwest deal was found by Cheapflights users on 4/10. 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.
Wed 5/62:10 pm
ONT
- LAS
Nonstop1h 05m
Southwest
Deal found 4/10![Southwest logo]()
$49
This Southwest deal was found by Cheapflights users on 4/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/106:10 am
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 4/11![Southwest logo]()
$49
This Trip.com deal was found by Cheapflights users on 4/9. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/233:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 4/9![Frontier logo]()
$50
This Kiwi.com deal was found by Cheapflights users on 4/8. 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.
Thu 7/911:43 am
ONT
- LAS
Nonstop1h 08m
Frontier
Deal found 4/8![Frontier logo]()
$55
This Southwest deal was found by Cheapflights users on 4/7. 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.
Tue 5/127:30 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 4/7![Southwest logo]()
$59
This Kiwi.com deal was found by Cheapflights users on 4/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/15:33 pm
ONT
- LAS
1 stop26h 38m
Frontier
Deal found 4/9![Frontier logo]()
$63
This Super.com deal was found by Cheapflights users on 4/10. 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.
Thu 6/183:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 4/10![Frontier logo]()
$64
This Kiwi.com deal was found by Cheapflights users on 4/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/610:50 am
ONT
- LAS
1 stop9h 13m
Frontier
Deal found 4/7![Frontier logo]()
$65
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 April 12, 2026.
Round-trip from | $66 (Super.com) |
|---|---|
One-way from | $37 (Kiwi.com) |
Good round-trip deal | $177 or less |
Good one-way deal | $88 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 April 12, 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
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Thu 5/7
12:48 pm-2:20 pm
Nonstop1h 32m
Santa Rosa Sonoma County
Sat 5/9
10:41 am-12:08 pm
Nonstop1h 27m
$137
Quickest round-trip
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Mon 5/4
3:55 pm-5:10 pm
Nonstop1h 15m
San Jose
Wed 5/6
12:30 pm-1:45 pm
Nonstop1h 15m
$147
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Fri 5/1
12:48 pm-2:20 pm
Nonstop1h 32m
Santa Rosa Sonoma County
Mon 5/4
10:41 am-12:08 pm
Nonstop1h 27m
$157
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Mon 5/11
5:05 pm-10:25 pm
1 stop5h 20m
San Jose
Wed 5/13
6:05 am-11:55 am
1 stop5h 50m
$157
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Mon 5/4
3:00 pm-10:10 pm
2 stops7h 10m
San Francisco
Wed 5/6
8:55 am-3:05 pm
2 stops6h 10m
$184
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Fri 5/22
3:35 pm-5:04 pm
Nonstop1h 29m
Santa Rosa Sonoma County
Sat 5/23
5:44 pm-7:08 pm
Nonstop1h 24m
$197
OntarioSacramento
ONT - SMF
ONTSMF
Ontario
Wed 5/6
12:40 pm-6:15 pm
2 stops5h 35m
Sacramento Intl
Wed 5/6
7:30 pm-8:50 pm
Nonstop1h 20m
$204
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 5/6
6:00 am-7:29 am
Nonstop1h 29m
San Francisco
Tue 5/12
8:10 am-9:41 am
Nonstop1h 31m
$207
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Fri 5/1
12:48 pm-2:20 pm
Nonstop1h 32m
Santa Rosa Sonoma County
Sun 5/3
10:41 am-12:08 pm
Nonstop1h 27m
$207
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Thu 7/9
6:43 pm-8:14 pm
Nonstop1h 31m
Santa Rosa Sonoma County
Sun 7/12
4:35 pm-6:03 pm
Nonstop1h 28m
$217
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-LAS
ONT-SJC
ONT-STS
ONT-SFO
ONT-SMF
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-LAS
ONT-SJC
ONT-STS
ONT-SFO
What is the cheapest month to book a flight from Ontario to California?
Currently, May is the cheapest month in which you can book a flight from Ontario to California (average of $32). Flying from Ontario to California in October is currently the most expensive (average of $58). 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 April 12, 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.
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 April 11, 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 April 12, 2026.
Get a feel of what it's like to fly with Southwest,Alaska Airlines, 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
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Boarding
8.1
Comfort
8.0
Entertainment
7.5
Crew
8.6
Food
7.0
Overall
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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.
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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 April 12, 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 4 airlines flying from Ontario to California
Discover the top 4 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 April 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$27 | Average$133 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$68 | Average$255 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$78 | Average$173 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$114 | Average$304 | FlexibilityNo cancel fee | On-time63% |