$28+ 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 8/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Aug 23 — Aug 301
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to California with Cheapflights
1. Tell us where you want to go
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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 24, 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 24, 2026.
This Frontier deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/38:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Fri 9/1112:31 pm
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/20![Frontier logo]()
$79
This Frontier deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/38:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Sun 9/69:00 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/23![Frontier logo]()
$81
This Kiwi.com deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/38:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 9/79:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/21![Frontier logo]()
$84
This Trip.com deal was found by Cheapflights users on 7/18. Clicking the “Pick Dates” 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.
Fri 9/1111:38 am
ONT
- SFO
Nonstop1h 34m
Frontier
Mon 9/1412:31 pm
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/18![Frontier logo]()
$85
This Super.com deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/228:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Wed 9/212:33 pm
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 7/20![Frontier logo]()
$86
This Super.com deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 8/158:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Wed 8/1912:33 pm
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 7/19![Frontier logo]()
$87
This Frontier deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 8/118:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Tue 8/1812:33 pm
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 7/19![Frontier logo]()
$88
This Super.com deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 8/108:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Sat 8/229:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/19![Frontier logo]()
$89
This Frontier deal was found by Cheapflights users on 7/18. Clicking the “Pick Dates” 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
Tue 8/1812:33 pm
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 7/18![Frontier logo]()
$90
This Super.com deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 8/108:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Thu 8/139:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/19![Frontier logo]()
$91
This Frontier deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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
Thu 8/209:00 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/19![Frontier logo]()
$92
This Frontier deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/38:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Thu 9/106:44 pm
SFO
- ONT
Nonstop1h 33m
Frontier
Deal found 7/20![Frontier logo]()
$93
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 24, 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 24, 2026.
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/246:45 pm
ONT
- SJC
Nonstop1h 10m
Southwest
Thu 8/276:30 am
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 7/22![Southwest logo]()
$97
This Alaska Airlines deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/204:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Sat 8/222:14 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 7/21![Alaska Airlines logo]()
$157
This United Airlines deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/71:52 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Thu 10/810:43 am
SFO
- ONT
Nonstop1h 35m
United Airlines
Deal found 7/21![United Airlines logo]()
$207
This Kiwi.com deal was found by Cheapflights users on 7/18. Clicking the “Pick Dates” 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 8/118:58 am
ONT
- SAN
1 stop15h 01m
Frontier
Tue 8/186:25 am
SAN
- ONT
2 stops12h 36m
Frontier
Deal found 7/18![Frontier logo]()
$248
This American Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2412:59 pm
ONT
- SAN
1 stop29h 19m
American Airlines
Thu 8/2710:57 am
SAN
- ONT
1 stop7h 18m
American Airlines
Deal found 7/22![American Airlines logo]()
$268
This Alaska Airlines deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/264:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Wed 9/302:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 7/20![Alaska Airlines logo]()
$157
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/285:00 pm
ONT
- SFO
1 stop5h 45m
Southwest
Sat 10/318:10 am
SFO
- ONT
1 stop4h 35m
Southwest
Deal found 7/23![Southwest logo]()
$157
This Delta deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/245:15 pm
ONT
- MFR
1 stop6h 40m
Delta
Sat 9/265:15 am
MFR
- ONT
1 stop6h 59m
Delta
Deal found 7/22![Delta logo]()
$347
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/2610:15 am
ONT
- SFO
2 stops8h 10m
Southwest
Mon 9/285:10 am
SFO
- ONT
1 stop6h 15m
Southwest
Deal found 7/23![Southwest logo]()
$162
This United Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/241:52 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Sat 9/264:15 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 7/23![United Airlines logo]()
$207
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1510:15 am
ONT
- SFO
1 stop7h 15m
Southwest
Mon 8/175:10 am
SFO
- ONT
1 stop4h 45m
Southwest
Deal found 7/22![Southwest logo]()
$172
This United Airlines deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:08 am
ONT
- SFO
Nonstop1h 27m
United Airlines
Wed 9/164:45 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 7/21![United Airlines logo]()
$207
This Southwest deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/2610:55 am
ONT
- SMF
Nonstop1h 20m
Southwest
Wed 9/26:05 am
SMF
- ONT
1 stop4h 20m
Southwest
Deal found 7/20![Southwest logo]()
$187
This United Airlines deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/196:07 am
ONT
- SFO
Nonstop1h 27m
United Airlines
Wed 10/219:25 pm
SFO
- ONT
Nonstop1h 34m
United Airlines
Deal found 7/21![United Airlines logo]()
$207
This Frontier deal was found by Cheapflights users on 7/18. Clicking the “Pick Dates” 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 8/1511:47 am
ONT
- SMF
1 stop3h 45m
Frontier
Sat 8/2211:42 am
SMF
- ONT
1 stop12h 08m
Frontier
Deal found 7/18![Frontier logo]()
$258
This Alaska Airlines deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/254:27 pm
ONT
- SAN
1 stop15h 38m
Alaska Airlines
Sat 8/297:57 am
SAN
- ONT
1 stop7h 55m
Alaska Airlines
Deal found 7/21![Alaska Airlines logo]()
$243
This United Airlines deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/269:01 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Wed 8/266:30 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 7/22![United Airlines logo]()
$207
This Southwest deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 10/155:15 pm
ONT
- SJC
1 stop5h 45m
Southwest
Sat 10/179:30 am
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 7/19![Southwest logo]()
$191
This Priceline deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/204:27 pm
ONT
- SAN
1 stop4h 09m
Alaska Airlines
Thu 8/277:57 am
SAN
- ONT
1 stop7h 50m
Alaska Airlines
Deal found 7/23![Alaska Airlines logo]()
$243
This Alaska Airlines deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/204:27 pm
ONT
- SAN
1 stop4h 09m
Alaska Airlines
Mon 8/249:59 pm
SAN
- ONT
1 stop17h 48m
Alaska Airlines
Deal found 7/20![Alaska Airlines logo]()
$243
This Southwest deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/253:40 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Mon 9/2810:55 am
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 7/21![Southwest logo]()
$213
This United Airlines deal was found by Cheapflights users on 7/18. Clicking the “Pick Dates” 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 9/96:08 am
ONT
- SFO
Nonstop1h 27m
United Airlines
Fri 9/116:30 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 7/18![United Airlines logo]()
$237
This Delta deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/256:00 pm
ONT
- MFR
1 stop5h 17m
Delta
Sun 9/276:13 am
MFR
- ONT
1 stop5h 01m
Delta
Deal found 7/22![Delta logo]()
$347
This Alaska Airlines deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/284:27 pm
ONT
- SAN
1 stop15h 38m
Alaska Airlines
Tue 9/19:59 pm
SAN
- ONT
1 stop17h 48m
Alaska Airlines
Deal found 7/23![Alaska Airlines logo]()
$243
This Delta deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/126:20 am
ONT
- MFR
1 stop6h 26m
Delta
Sun 9/136:13 am
MFR
- ONT
1 stop5h 01m
Delta
Deal found 7/23![Delta logo]()
$348
This Southwest deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/245:45 pm
ONT
- OAK
1 stop3h 25m
Southwest
Mon 9/286:00 pm
OAK
- ONT
1 stop4h 05m
Southwest
Deal found 7/21![Southwest logo]()
$217
This Alaska Airlines deal was found by Cheapflights users on 7/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/244:27 pm
ONT
- SAN
1 stop4h 09m
Alaska Airlines
Thu 10/19:59 pm
SAN
- ONT
1 stop17h 48m
Alaska Airlines
Deal found 7/21![Alaska Airlines logo]()
$253
This United Airlines deal was found by Cheapflights users on 7/18. Clicking the “Pick Dates” 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 8/155:00 am
ONT
- SMF
1 stop8h 17m
United Airlines
Sat 8/2211:53 am
SMF
- ONT
1 stop3h 48m
United Airlines
Deal found 7/18![United Airlines logo]()
$267
This Delta deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 9/106:20 am
ONT
- MFR
1 stop6h 26m
Delta
Sun 9/136:13 am
MFR
- ONT
1 stop5h 01m
Delta
Deal found 7/19![Delta logo]()
$368
This Southwest deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/125:40 am
ONT
- OAK
2 stops6h 05m
Southwest
Tue 9/155:10 pm
OAK
- ONT
Nonstop1h 25m
Southwest
Deal found 7/23![Southwest logo]()
$234
Last-minute flights from Ontario to CaliforniaDiscover last-minute flight deals from Ontario to California. Data last updated July 24, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to California. Data last updated July 24, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 8/108:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Wed 8/1211:15 am
SFO
- ONT
Nonstop1h 33m
Frontier
Deal found 7/19![Frontier logo]()
$89
This Super.com deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 8/108:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Thu 8/139:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/19![Frontier logo]()
$91
This Frontier deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 8/118:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Tue 8/1812:33 pm
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 7/19![Frontier logo]()
$88
This Frontier deal was found by Cheapflights users on 7/18. Clicking the “Pick Dates” 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 8/118:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Sat 8/159:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/18![Frontier logo]()
$105
This Frontier deal was found by Cheapflights users on 7/18. Clicking the “Pick Dates” 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
Tue 8/1812:33 pm
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 7/18![Frontier logo]()
$90
This Frontier deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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
Thu 8/209:00 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/19![Frontier logo]()
$92
This Super.com deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 8/158:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Wed 8/1912:33 pm
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 7/19![Frontier logo]()
$87
This Southwest deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/191:15 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Wed 8/267:15 am
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 7/22![Southwest logo]()
$97
This Super.com deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/228:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Wed 9/212:33 pm
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 7/20![Frontier logo]()
$86
This Trip.com deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/253:13 pm
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 8/319:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/20![Frontier logo]()
$94
This Frontier deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/278:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 8/319:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/22![Frontier logo]()
$102
This Frontier deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/298:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 8/319:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/22![Frontier logo]()
$97
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 24, 2026.
Search for one-way flight options from Ontario to California. Find affordable one-way fares based on user searches. Data last updated July 24, 2026.
This Booking.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/248:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/22![Frontier logo]()
$28
This Trip.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/1211:38 am
ONT
- SFO
Nonstop1h 34m
Frontier
Deal found 7/22![Frontier logo]()
$29
This Trip.com deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/128:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/23![Frontier logo]()
$31
This Super.com deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 9/68:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/19![Frontier logo]()
$33
This Trip.com deal was found by Cheapflights users on 7/18. Clicking the “Pick Dates” 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.
Fri 9/1111:38 am
ONT
- SFO
Nonstop1h 34m
Frontier
Deal found 7/18![Frontier logo]()
$36
This Super.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/911:38 am
ONT
- SFO
Nonstop1h 34m
Frontier
Deal found 7/22![Frontier logo]()
$43
This Super.com deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 9/78:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/19![Frontier logo]()
$45
This Gotogate deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/108:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/19![Frontier logo]()
$46
This Frontier deal was found by Cheapflights users on 7/19. Clicking the “Pick Dates” 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 7/19![Frontier logo]()
$47
This Southwest deal was found by Cheapflights users on 7/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/228:35 am
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 7/20![Southwest logo]()
$49
This Kiwi.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/253:13 pm
ONT
- SAN
1 stop23h 37m
Frontier
Deal found 7/22![Frontier logo]()
$52
This Kiwi.com deal was found by Cheapflights users on 7/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/183:13 pm
ONT
- LAS
1 stop21h 52m
Frontier
Deal found 7/22![Frontier logo]()
$52
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 24, 2026.
Round-trip from | $76 (Frontier) |
|---|---|
One-way from | $28 (Booking.com) |
Good round-trip deal | $173 or less |
Good one-way deal | $90 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 24, 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
Quickest round-trip
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Mon 8/24
6:45 pm-7:55 pm
Nonstop1h 10m
San Jose
Thu 8/27
6:30 am-7:50 am
Nonstop1h 20m
$97
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Thu 8/20
4:27 pm-6:07 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Sat 8/22
2:14 pm-3:52 pm
Nonstop1h 38m
$157
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Sat 9/26
4:27 pm-6:07 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Wed 9/30
2:09 pm-3:47 pm
Nonstop1h 38m
$157
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 10/28
5:00 pm-10:45 pm
1 stop5h 45m
San Francisco
Sat 10/31
8:10 am-12:45 pm
1 stop4h 35m
$157
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Sat 9/26
10:15 am-6:25 pm
2 stops8h 10m
San Francisco
Mon 9/28
5:10 am-11:25 am
1 stop6h 15m
$162
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Sat 8/15
10:15 am-5:30 pm
1 stop7h 15m
San Francisco
Mon 8/17
5:10 am-9:55 am
1 stop4h 45m
$172
OntarioSacramento
ONT - SMF
ONTSMF
Ontario
Wed 8/26
10:55 am-12:15 pm
Nonstop1h 20m
Sacramento Intl
Wed 9/2
6:05 am-10:25 am
1 stop4h 20m
$187
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Thu 10/15
5:15 pm-11:00 pm
1 stop5h 45m
San Jose
Sat 10/17
9:30 am-10:50 am
Nonstop1h 20m
$191
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 10/7
1:52 pm-3:21 pm
Nonstop1h 29m
San Francisco
Thu 10/8
10:43 am-12:18 pm
Nonstop1h 35m
$207
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Thu 9/24
1:52 pm-3:21 pm
Nonstop1h 29m
San Francisco
Sat 9/26
4:15 pm-5:46 pm
Nonstop1h 31m
$207
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-SJC
ONT-SMF
ONT-STS
ONT-MRY
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-SJC
ONT-SMF
ONT-STS
What is the cheapest month to book a flight from Ontario to California?
Currently, October is the cheapest month in which you can book a flight from Ontario to California (average of $168). Flying from Ontario to California in January is currently the most expensive (average of $321). 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 24, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 20% 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 21 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 18, 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 24, 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
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Boarding
8.1
Crew
8.6
Food
7.0
Entertainment
7.5
Overall
8.0
Comfort
8.0
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - 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 July 24, 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 24, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$136 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$78 | Average$167 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$92 | Average$326 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$126 | Average$323 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$153 | Average$212 | FlexibilityNo cancel fee | On-time62% |