$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 6/30. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Jul 12 — Jul 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 June 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 June 12, 2026.
This Super.com deal was found by Cheapflights users on 6/10. 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 7/33:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sat 7/41:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/10![Frontier logo]()
$74
This Super.com deal was found by Cheapflights users on 6/10. 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.
Tue 6/303:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Fri 7/31:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/10![Frontier logo]()
$75
This Super.com deal was found by Cheapflights users on 6/11. 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 9/21:27 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 9/51:56 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/11![Frontier logo]()
$77
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.
Wed 7/11:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 7/41:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/8![Frontier logo]()
$78
This Frontier deal was found by Cheapflights users on 6/10. 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.
Wed 7/291:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Tue 8/47:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/10![Frontier logo]()
$79
This CheapOair deal was found by Cheapflights users on 6/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/43:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Tue 7/72:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/11![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.
Mon 9/711:43 am
ONT
- LAS
Nonstop1h 08m
Frontier
Tue 9/86:40 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/7![Frontier logo]()
$81
This Frontier deal was found by Cheapflights users on 6/11. 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.
Tue 7/71:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 7/112:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/11![Frontier logo]()
$82
This Agoda.com deal was found by Cheapflights users on 6/12. 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 Agoda.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/151:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 7/187:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/12![Frontier logo]()
$84
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.
Wed 9/302:58 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Wed 10/73:00 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 6/7![Frontier logo]()
$86
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.
Fri 7/313:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Wed 8/52:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/7![Frontier logo]()
$87
This Trip.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/18:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Tue 8/411:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Deal found 6/12![Frontier logo]()
$105
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 June 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 June 12, 2026.
This Southwest deal was found by Cheapflights users on 6/11. 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.
Fri 7/36:35 pm
ONT
- LAS
1 stop3h 15m
Southwest
Sat 7/411:45 am
LAS
- ONT
2 stops7h 20m
Southwest
Deal found 6/11![Southwest logo]()
$187
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.
Mon 12/76:00 am
ONT
- STS
1 stop4h 39m
Delta
Mon 12/2111:25 am
STS
- ONT
1 stop4h 47m
Delta
Deal found 6/8![Delta logo]()
$222
This United Airlines deal was found by Cheapflights users on 6/9. 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.
Wed 8/56:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Wed 8/510:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 6/9![United Airlines logo]()
$226
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.
Thu 7/236:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sun 7/264:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/7![Alaska Airlines logo]()
$227
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/1411:47 am
ONT
- SAN
1 stop8h 19m
Frontier
Sun 8/167:45 pm
SAN
- ONT
1 stop15h 17m
Frontier
Deal found 6/7![Frontier logo]()
$304
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/233:34 pm
ONT
- FAT
1 stop18h 12m
Multiple Airlines
Fri 6/263:31 pm
FAT
- ONT
1 stop4h 20m
Multiple Airlines
Deal found 6/7![Multiple Airlines logo]()
$334
This Southwest deal was found by Cheapflights users on 6/11. 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 7/226:10 am
ONT
- SJC
Nonstop1h 15m
Southwest
Thu 7/236:25 am
SJC
- ONT
1 stop4h 55m
Southwest
Deal found 6/11![Southwest logo]()
$188
This Southwest deal was found by Cheapflights users on 6/11. 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 8/47:45 am
ONT
- SJC
2 stops5h 05m
Southwest
Tue 8/44:40 pm
SJC
- ONT
1 stop4h 15m
Southwest
Deal found 6/11![Southwest logo]()
$206
This Alaska Airlines deal was found by Cheapflights users on 6/10. 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 7/26:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sat 7/44:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/10![Alaska Airlines logo]()
$227
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.
Mon 8/246:00 am
ONT
- SMF
1 stop6h 18m
Delta
Thu 8/275:00 pm
SMF
- ONT
1 stop6h 34m
Delta
Deal found 6/8![Delta logo]()
$243
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.
Thu 8/201:06 pm
ONT
- SMF
1 stop5h 11m
Delta
Thu 8/277:18 pm
SMF
- ONT
1 stop4h 16m
Delta
Deal found 6/8![Delta logo]()
$243
This United Airlines deal was found by Cheapflights users on 6/11. 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 8/16:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Sat 8/810:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 6/11![United Airlines logo]()
$269
This Southwest deal was found by Cheapflights users on 6/10. 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 8/124:45 pm
ONT
- SJC
1 stop3h 20m
Southwest
Mon 8/174:00 pm
SJC
- ONT
1 stop3h 25m
Southwest
Deal found 6/10![Southwest logo]()
$228
This United Airlines deal was found by Cheapflights users on 6/11. 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 10/71:52 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Thu 10/89:25 pm
SFO
- ONT
Nonstop1h 34m
United Airlines
Deal found 6/11![United Airlines logo]()
$270
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.
Sat 10/311:40 pm
ONT
- LAS
1 stop6h 55m
Southwest
Mon 11/25:30 am
LAS
- ONT
1 stop5h 10m
Southwest
Deal found 6/8![Southwest logo]()
$237
This Alaska Airlines deal was found by Cheapflights users on 6/9. 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.
Fri 6/266:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sat 6/274:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/9![Alaska Airlines logo]()
$287
This United Airlines deal was found by Cheapflights users on 6/11. 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.
Tue 10/134:07 pm
ONT
- SFO
Nonstop1h 43m
United Airlines
Thu 10/2210:43 am
SFO
- ONT
Nonstop1h 35m
United Airlines
Deal found 6/11![United Airlines logo]()
$270
This Delta deal was found by Cheapflights users on 6/9. 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.
Thu 10/296:00 am
ONT
- RNO
1 stop5h 31m
Delta
Sat 10/315:20 pm
RNO
- ONT
1 stop6h 28m
Delta
Deal found 6/9![Delta logo]()
$281
This Alaska Airlines deal was found by Cheapflights users on 6/11. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/56:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Fri 8/74:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/11![Alaska Airlines logo]()
$287
This Southwest deal was found by Cheapflights users on 6/9. 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 7/235:15 am
ONT
- LAS
1 stop3h 25m
Southwest
Tue 7/285:55 am
LAS
- ONT
1 stop3h 20m
Southwest
Deal found 6/9![Southwest logo]()
$238
This Kissandfly.com deal was found by Cheapflights users on 6/10. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/118:58 am
ONT
- SAN
1 stop9h 41m
Frontier
Mon 7/1311:01 am
SAN
- ONT
1 stop11h 36m
Frontier
Deal found 6/10![Frontier logo]()
$363
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/19:01 am
ONT
- SMF
1 stop4h 06m
United Airlines
Wed 9/26:30 am
SMF
- ONT
1 stop5h 42m
United Airlines
Deal found 6/8![United Airlines logo]()
$281
This Alaska Airlines deal was found by Cheapflights users on 6/9. 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.
Sat 6/276:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Mon 6/294:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/9![Alaska Airlines logo]()
$287
This Southwest deal was found by Cheapflights users on 6/11. 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 9/86:00 am
ONT
- OAK
Nonstop1h 15m
Southwest
Sun 9/136:05 am
OAK
- ONT
1 stop3h 25m
Southwest
Deal found 6/11![Southwest logo]()
$241
This United Airlines deal was found by Cheapflights users on 6/11. 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 7/114:20 pm
ONT
- SFO
Nonstop1h 30m
United Airlines
Sat 7/1810:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 6/11![United Airlines logo]()
$287
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.
Mon 9/216:10 am
ONT
- LAS
2 stops5h 15m
Southwest
Thu 9/245:45 pm
LAS
- ONT
1 stop3h 30m
Southwest
Deal found 6/8![Southwest logo]()
$242
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.
Tue 7/216:20 am
ONT
- MFR
1 stop6h 36m
Delta
Fri 7/245:24 pm
MFR
- ONT
1 stop5h 28m
Delta
Deal found 6/8![Delta logo]()
$331
This United Airlines deal was found by Cheapflights users on 6/11. 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 7/111:50 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
Wed 7/1510:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 6/11![United Airlines logo]()
$287
This Kiwi.com deal was found by Cheapflights users on 6/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/123:40 pm
ONT
- SAN
2 stops32h 24m
Frontier
Sun 7/198:51 pm
SAN
- ONT
1 stop11h 12m
Frontier
Deal found 6/11![Frontier logo]()
$426
This Southwest deal was found by Cheapflights users on 6/10. 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 7/2812:45 pm
ONT
- LAS
1 stop3h 50m
Southwest
Fri 7/314:45 pm
LAS
- ONT
2 stops4h 50m
Southwest
Deal found 6/10![Southwest logo]()
$243
Last-minute flights from Ontario to CaliforniaDiscover last-minute flight deals from Ontario to California. Data last updated June 12, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to California. Data last updated June 12, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 6/10. 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.
Tue 6/303:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Fri 7/31:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/10![Frontier logo]()
$75
This Super.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/13:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sat 7/46:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/12![Frontier logo]()
$78
This Super.com deal was found by Cheapflights users on 6/10. 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 7/33:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sat 7/41:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/10![Frontier logo]()
$74
This Frontier deal was found by Cheapflights users on 6/11. 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.
Fri 7/33:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sat 7/112:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/11![Frontier logo]()
$89
This Priceline deal was found by Cheapflights users on 6/9. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/33:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Fri 7/36:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/9![Frontier logo]()
$92
This CheapOair deal was found by Cheapflights users on 6/11. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/43:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Tue 7/72:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/11![Frontier logo]()
$80
This Frontier deal was found by Cheapflights users on 6/11. 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.
Tue 7/71:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 7/112:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/11![Frontier logo]()
$82
This Southwest deal was found by Cheapflights users on 6/11. 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 7/78:55 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Tue 7/146:20 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 6/11![Southwest logo]()
$109
This Agoda.com deal was found by Cheapflights users on 6/12. 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 Agoda.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/151:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 7/187:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/12![Frontier logo]()
$84
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.
Mon 7/208:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Thu 7/309:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/7![Frontier logo]()
$107
This Frontier deal was found by Cheapflights users on 6/10. 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.
Wed 7/291:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Tue 8/47:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/10![Frontier logo]()
$79
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.
Fri 7/313:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Wed 8/52:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/7![Frontier logo]()
$87
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 June 12, 2026.
Search for one-way flight options from Ontario to California. Find affordable one-way fares based on user searches. Data last updated June 12, 2026.
This Flightnetwork deal was found by Cheapflights users on 6/10. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/303:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/10![Frontier logo]()
$34
This Trip.com deal was found by Cheapflights users on 6/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/73:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/12![Frontier logo]()
$35
This Frontier deal was found by Cheapflights users on 6/10. 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.
Sun 9/63:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/10![Frontier logo]()
$39
This Super.com deal was found by Cheapflights users on 6/10. 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 7/33:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/10![Frontier logo]()
$40
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.
Sat 8/13:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/7![Frontier logo]()
$44
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.
Wed 8/121:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/8![Frontier logo]()
$45
This Expedia deal was found by Cheapflights users on 6/10. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/83:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/10![Frontier logo]()
$46
This Flightnetwork deal was found by Cheapflights users on 6/10. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/51:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/10![Frontier logo]()
$47
This Super.com deal was found by Cheapflights users on 6/10. 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.
Tue 8/41:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/10![Frontier logo]()
$48
This CheapOair deal was found by Cheapflights users on 6/9. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/251:27 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/9![Frontier logo]()
$51
This Southwest deal was found by Cheapflights users on 6/11. 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 7/88:55 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 6/11![Southwest logo]()
$55
This Frontier deal was found by Cheapflights users on 6/9. 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 11/211:38 am
ONT
- SFO
Nonstop1h 34m
Frontier
Deal found 6/9![Frontier logo]()
$62
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 June 12, 2026.
Round-trip from | $74 (Super.com) |
|---|---|
One-way from | $34 (Flightnetwork) |
Good round-trip deal | $184 or less |
Good one-way deal | $131 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 June 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
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Fri 7/3
6:35 pm-9:50 pm
1 stop3h 15m
Las Vegas Harry Reid Intl
Sat 7/4
11:45 am-7:05 pm
2 stops7h 20m
$187
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Wed 7/22
6:10 am-7:25 am
Nonstop1h 15m
San Jose
Thu 7/23
6:25 am-11:20 am
1 stop4h 55m
$188
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Tue 8/4
7:45 am-12:50 pm
2 stops5h 05m
San Jose
Tue 8/4
4:40 pm-8:55 pm
1 stop4h 15m
$206
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Mon 12/7
6:00 am-10:39 am
1 stop4h 39m
Santa Rosa Sonoma County
Mon 12/21
11:25 am-4:12 pm
1 stop4h 47m
$222
Quickest round-trip
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 8/5
6:00 am-7:25 am
Nonstop1h 25m
San Francisco
Wed 8/5
10:40 am-12:12 pm
Nonstop1h 32m
$226
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Thu 7/23
6:43 pm-8:14 pm
Nonstop1h 31m
Santa Rosa Sonoma County
Sun 7/26
4:35 pm-6:03 pm
Nonstop1h 28m
$227
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Thu 7/2
6:43 pm-8:14 pm
Nonstop1h 31m
Santa Rosa Sonoma County
Sat 7/4
4:35 pm-6:03 pm
Nonstop1h 28m
$227
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Wed 8/12
4:45 pm-8:05 pm
1 stop3h 20m
San Jose
Mon 8/17
4:00 pm-7:25 pm
1 stop3h 25m
$228
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Sat 10/31
1:40 pm-8:35 pm
1 stop6h 55m
Las Vegas Harry Reid Intl
Mon 11/2
5:30 am-10:40 am
1 stop5h 10m
$237
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Thu 7/23
5:15 am-8:40 am
1 stop3h 25m
Las Vegas Harry Reid Intl
Tue 7/28
5:55 am-9:15 am
1 stop3h 20m
$238
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-STS
ONT-SMF
ONT-SFO
ONT-FAT
ONT-LAS
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-STS
ONT-SMF
ONT-SFO
ONT-FAT
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 $389). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from ONT to 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 June 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.
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 90 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 June 8, 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 June 12, 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
Food
7.0
Entertainment
7.0
Overall
7.9
Crew
8.5
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Comfort
7.8
Food
7.0
Entertainment
7.0
Overall
7.9
Crew
8.5
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Comfort
7.8
Food
7.0
Entertainment
7.0
Overall
7.9
Crew
8.5
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Comfort
7.8
Food
7.0
Entertainment
7.0
Overall
7.9
Crew
8.5
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Comfort
7.8
Food
7.0
Entertainment
7.0
Overall
7.9
Crew
8.5
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Comfort
7.8
Food
7.0
Entertainment
7.0
Overall
7.9
Crew
8.5
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
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
Toggle through the tabs below to find thousands of 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 June 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 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 June 12, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$134 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$78 | Average$157 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$89 | Average$246 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$124 | Average$314 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$153 | Average$169 | FlexibilityNo cancel fee | On-time62% |