$38+ 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 9/6. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Jul 25 — Aug 11
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 25, 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 25, 2026.
This Super.com deal was found by Cheapflights users on 6/21. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/301:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Wed 7/16:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/21![Frontier logo]()
$81
This CheapOair deal was found by Cheapflights users on 6/21. 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 CheapOair 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 6/21![Frontier logo]()
$85
This Super.com deal was found by Cheapflights users on 6/23. 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 Super.com 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 7/147:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/23![Frontier logo]()
$91
This Kiwi.com deal was found by Cheapflights users on 6/21. 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.
Sat 9/53:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sun 9/67:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/21![Frontier logo]()
$92
This Frontier deal was found by Cheapflights users on 6/22. 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.
Tue 6/303:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sat 7/182:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/22![Frontier logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 6/22. 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 9/13:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 9/52:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/22![Frontier logo]()
$94
This Frontier deal was found by Cheapflights users on 6/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/23:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 9/52:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/21![Frontier logo]()
$102
This Frontier deal was found by Cheapflights users on 6/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/243:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Mon 8/248:21 pm
LAS
- ONT
Nonstop1h 06m
Frontier
Deal found 6/21![Frontier logo]()
$103
This Kiwi.com deal was found by Cheapflights users on 6/21. 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.
Tue 8/115:08 pm
ONT
- LAS
Nonstop1h 06m
Frontier
Mon 8/177:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/21![Frontier logo]()
$105
This Frontier deal was found by Cheapflights users on 6/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/68:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 8/179:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 6/25![Frontier logo]()
$107
This Frontier deal was found by Cheapflights users on 6/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/104:34 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Mon 8/172:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/21![Frontier logo]()
$108
This Frontier deal was found by Cheapflights users on 6/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/28:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Wed 8/511:15 am
SFO
- ONT
Nonstop1h 33m
Frontier
Deal found 6/21![Frontier logo]()
$112
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 25, 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 25, 2026.
This Southwest deal was found by Cheapflights users on 6/21. 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.
Wed 8/129:05 am
ONT
- SJC
Nonstop1h 10m
Southwest
Wed 8/122:55 pm
SJC
- ONT
2 stops6h 00m
Southwest
Deal found 6/21![Southwest logo]()
$132
This Alaska Airlines deal was found by Cheapflights users on 6/20. 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
Tue 9/292:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 6/20![Alaska Airlines logo]()
$157
This United Airlines deal was found by Cheapflights users on 6/23. 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.
Wed 9/301:52 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Sat 10/109:25 pm
SFO
- ONT
Nonstop1h 34m
United Airlines
Deal found 6/23![United Airlines logo]()
$187
This Delta deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/155:05 pm
ONT
- SMF
1 stop5h 06m
Delta
Mon 8/175:00 pm
SMF
- ONT
1 stop6h 34m
Delta
Deal found 6/24![Delta logo]()
$221
This Southwest deal was found by Cheapflights users on 6/23. 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 8/192:10 pm
ONT
- SJC
2 stops5h 55m
Southwest
Sat 8/223:25 pm
SJC
- ONT
1 stop4h 40m
Southwest
Deal found 6/23![Southwest logo]()
$142
This Alaska Airlines deal was found by Cheapflights users on 6/21. 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.
Sat 9/124:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Tue 9/152:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 6/21![Alaska Airlines logo]()
$157
This Southwest deal was found by Cheapflights users on 6/22. 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.
Tue 8/41:10 pm
ONT
- SJC
2 stops6h 55m
Southwest
Tue 8/182:55 pm
SJC
- ONT
2 stops6h 00m
Southwest
Deal found 6/22![Southwest logo]()
$147
This Southwest deal was found by Cheapflights users on 6/23. 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.
Mon 10/194:00 pm
ONT
- SJC
Nonstop1h 20m
Southwest
Tue 10/207:00 am
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 6/23![Southwest logo]()
$149
This Alaska Airlines deal was found by Cheapflights users on 6/21. 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.
Wed 9/164:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Sun 9/202:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 6/21![Alaska Airlines logo]()
$167
This United Airlines deal was found by Cheapflights users on 6/23. 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.
Tue 7/216:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Tue 7/2810:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 6/23![United Airlines logo]()
$187
This Southwest deal was found by Cheapflights users on 6/23. 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.
Tue 8/116:25 pm
ONT
- SJC
Nonstop1h 10m
Southwest
Thu 8/138:10 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 6/23![Southwest logo]()
$149
This United Airlines deal was found by Cheapflights users on 6/23. 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.
Wed 9/301:52 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Tue 10/61:40 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 6/23![United Airlines logo]()
$187
This Alaska Airlines deal was found by Cheapflights users on 6/25. Clicking the “Pick Dates” 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 10/95:48 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sun 10/113:40 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/25![Alaska Airlines logo]()
$177
This Southwest deal was found by Cheapflights users on 6/23. 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 8/195:45 am
ONT
- SFO
1 stop5h 20m
Southwest
Sat 8/222:05 pm
SFO
- ONT
1 stop6h 00m
Southwest
Deal found 6/23![Southwest logo]()
$151
This United Airlines deal was found by Cheapflights users on 6/21. 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.
Tue 11/36:00 am
ONT
- SFO
Nonstop1h 30m
United Airlines
Tue 11/109:25 pm
SFO
- ONT
Nonstop1h 28m
United Airlines
Deal found 6/21![United Airlines logo]()
$187
This Delta deal was found by Cheapflights users on 6/23. 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.
Thu 8/136:00 am
ONT
- SMF
1 stop6h 18m
Delta
Thu 8/207:18 pm
SMF
- ONT
1 stop4h 16m
Delta
Deal found 6/23![Delta logo]()
$229
This United Airlines deal was found by Cheapflights users on 6/21. 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 10/89:25 pm
SFO
- ONT
Nonstop1h 34m
United Airlines
Deal found 6/21![United Airlines logo]()
$219
This Alaska Airlines deal was found by Cheapflights users on 6/23. 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.
Sat 7/256:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Mon 7/274:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/23![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 6/21. 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.
Tue 8/112:40 pm
ONT
- OAK
Nonstop1h 15m
Southwest
Tue 8/186:30 am
OAK
- ONT
Nonstop1h 25m
Southwest
Deal found 6/21![Southwest logo]()
$199
This United Airlines deal was found by Cheapflights users on 6/21. 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.
Thu 9/101:53 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Sat 9/124:40 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 6/21![United Airlines logo]()
$219
This Alaska Airlines deal was found by Cheapflights users on 6/22. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/206:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sun 7/264:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/22![Alaska Airlines logo]()
$227
This Delta deal was found by Cheapflights users on 6/21. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/141:06 pm
ONT
- SMF
1 stop5h 11m
Delta
Sun 8/167:18 pm
SMF
- ONT
1 stop4h 16m
Delta
Deal found 6/21![Delta logo]()
$309
This Southwest deal was found by Cheapflights users on 6/23. 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.
Tue 7/1410:20 am
ONT
- OAK
Nonstop1h 20m
Southwest
Wed 7/156:05 am
OAK
- ONT
Nonstop1h 25m
Southwest
Deal found 6/23![Southwest logo]()
$199
This United Airlines deal was found by Cheapflights users on 6/20. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/1511:00 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Mon 8/1710:37 am
SFO
- ONT
Nonstop1h 35m
United Airlines
Deal found 6/20![United Airlines logo]()
$219
This Southwest deal was found by Cheapflights users on 6/21. 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.
Sat 8/18:30 pm
ONT
- OAK
Nonstop1h 20m
Southwest
Tue 8/43:25 pm
OAK
- ONT
1 stop5h 30m
Southwest
Deal found 6/21![Southwest logo]()
$209
This Delta deal was found by Cheapflights users on 6/22. 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 10/305:05 pm
ONT
- MFR
1 stop6h 44m
Delta
Mon 11/26:05 am
MFR
- ONT
1 stop5h 11m
Delta
Deal found 6/22![Delta logo]()
$337
This United Airlines deal was found by Cheapflights users on 6/25. Clicking the “Pick Dates” 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 8/209:01 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Mon 8/246:30 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 6/25![United Airlines logo]()
$250
This Southwest deal was found by Cheapflights users on 6/21. 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.
Sat 7/183:50 pm
ONT
- OAK
Nonstop1h 20m
Southwest
Tue 7/217:05 am
OAK
- ONT
1 stop4h 25m
Southwest
Deal found 6/21![Southwest logo]()
$209
This Delta deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/145:15 pm
ONT
- RNO
1 stop6h 20m
Delta
Thu 9/176:00 am
RNO
- ONT
1 stop6h 14m
Delta
Deal found 6/24![Delta logo]()
$345
This Southwest deal was found by Cheapflights users on 6/25. Clicking the “Pick Dates” 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 8/54:45 pm
ONT
- SMF
Nonstop1h 25m
Southwest
Wed 8/128:00 am
SMF
- ONT
1 stop6h 05m
Southwest
Deal found 6/25![Southwest logo]()
$215
Last-minute flights from Ontario to CaliforniaDiscover last-minute flight deals from Ontario to California. Data last updated June 25, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to California. Data last updated June 25, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 6/21. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/301:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Wed 7/16:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/21![Frontier logo]()
$81
This Frontier deal was found by Cheapflights users on 6/22. 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.
Tue 6/303:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sat 7/182:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/22![Frontier logo]()
$93
This CheapOair deal was found by Cheapflights users on 6/21. 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 CheapOair 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 6/21![Frontier logo]()
$85
This Frontier deal was found by Cheapflights users on 6/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/311:58 am
ONT
- LAS
Nonstop1h 08m
Frontier
Fri 7/36:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/21![Frontier logo]()
$117
This Super.com deal was found by Cheapflights users on 6/23. 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 Super.com 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 7/147:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/23![Frontier logo]()
$91
This eDestinos deal was found by Cheapflights users on 6/23. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/141:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 7/187:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/23![Frontier logo]()
$114
This Southwest deal was found by Cheapflights users on 6/23. 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.
Tue 7/148:55 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Wed 7/158:55 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 6/23![Southwest logo]()
$117
This Super.com deal was found by Cheapflights users on 6/21. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/218:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Thu 7/239:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/21![Frontier logo]()
$120
This Kiwi.com deal was found by Cheapflights users on 6/22. 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.
Wed 7/221:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Mon 8/318:21 pm
LAS
- ONT
Nonstop1h 06m
Frontier
Deal found 6/22![Frontier logo]()
$119
This Kiwi.com deal was found by Cheapflights users on 6/20. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/238:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Sat 7/259:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/20![Frontier logo]()
$119
This Jettzy deal was found by Cheapflights users on 6/22. 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 Jettzy is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/253:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 8/12:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/22![Frontier logo]()
$109
This United Airlines deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” 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 7/256:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Sat 7/254:55 pm
SFO
- ONT
Nonstop1h 38m
United Airlines
Deal found 6/24![United Airlines logo]()
$117
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 25, 2026.
Search for one-way flight options from Ontario to California. Find affordable one-way fares based on user searches. Data last updated June 25, 2026.
This Super.com deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” 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 9/63:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/24![Frontier logo]()
$38
This Kiwi.com deal was found by Cheapflights users on 6/23. 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 Kiwi.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 6/23![Frontier logo]()
$45
This Frontier deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/318:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/24![Frontier logo]()
$46
This Priceline deal was found by Cheapflights users on 6/25. Clicking the “Pick Dates” 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
Deal found 6/25![Frontier logo]()
$47
This Frontier deal was found by Cheapflights users on 6/23. 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
Deal found 6/23![Frontier logo]()
$47
This Kiwi.com deal was found by Cheapflights users on 6/24. Clicking the “Pick Dates” 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 7/228:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 6/24![Frontier logo]()
$48
This Kiwi.com deal was found by Cheapflights users on 6/23. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/511:50 am
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 6/23![Frontier logo]()
$53
This CheapOair deal was found by Cheapflights users on 6/20. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1011:47 am
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 6/20![Frontier logo]()
$54
This Frontier deal was found by Cheapflights users on 6/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/313:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/21![Frontier logo]()
$55
This Kissandfly.com deal was found by Cheapflights users on 6/21. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/154:34 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 6/21![Frontier logo]()
$59
This United Airlines deal was found by Cheapflights users on 6/25. Clicking the “Pick Dates” 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 9/151:56 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Deal found 6/25![United Airlines logo]()
$59
This Southwest deal was found by Cheapflights users on 6/22. 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.
Tue 7/148:55 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 6/22![Southwest logo]()
$59
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 25, 2026.
Round-trip from | $92 (Kiwi.com) |
|---|---|
One-way from | $38 (Super.com) |
Good round-trip deal | $224 or less |
Good one-way deal | $146 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 25, 2026.
Use the filters below to find and compare flights from Ontario to California that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Wed 8/12
9:05 am-10:15 am
Nonstop1h 10m
San Jose
Wed 8/12
2:55 pm-8:55 pm
2 stops6h 00m
$132
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Wed 8/19
2:10 pm-8:05 pm
2 stops5h 55m
San Jose
Sat 8/22
3:25 pm-8:05 pm
1 stop4h 40m
$142
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Tue 8/4
1:10 pm-8:05 pm
2 stops6h 55m
San Jose
Tue 8/18
2:55 pm-8:55 pm
2 stops6h 00m
$147
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Mon 10/19
4:00 pm-5:20 pm
Nonstop1h 20m
San Jose
Tue 10/20
7:00 am-8:15 am
Nonstop1h 15m
$149
Quickest round-trip
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Tue 8/11
6:25 pm-7:35 pm
Nonstop1h 10m
San Jose
Thu 8/13
8:10 pm-9:25 pm
Nonstop1h 15m
$149
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 8/19
5:45 am-11:05 am
1 stop5h 20m
San Francisco
Sat 8/22
2:05 pm-8:05 pm
1 stop6h 00m
$151
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Sat 9/26
4:27 pm-6:07 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Tue 9/29
2:09 pm-3:47 pm
Nonstop1h 38m
$157
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Sat 9/12
4:27 pm-6:07 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Tue 9/15
2:09 pm-3:47 pm
Nonstop1h 38m
$157
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Wed 9/16
4:27 pm-6:07 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Sun 9/20
2:09 pm-3:47 pm
Nonstop1h 38m
$167
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Fri 10/9
5:48 pm-7:19 pm
Nonstop1h 31m
Santa Rosa Sonoma County
Sun 10/11
3:40 pm-5:08 pm
Nonstop1h 28m
$177
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-SFO
ONT-SJC
ONT-STS
ONT-FAT
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-SFO
ONT-SJC
ONT-STS
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 $379). 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 25, 2026.
Unlike in the afternoon, when flights are generally more expensive, you can save up to 25% 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 55 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 20, 2026.
Travelers seeking maximum savings on their Ontario to California flight should consider departing on Friday evenings when fares are most often at their lowest. Tuesday mornings 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 25, 2026.
Get a feel of what it's like to fly with Alaska Airlines,Southwest, andUnited Airlines from Ontario to California by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Food
7.0
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Food
7.0
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Food
7.0
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Food
7.0
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Food
7.0
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Boarding
8.1
Comfort
7.8
Crew
8.5
Overall
7.9
Food
7.0
Entertainment
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Related info for your journey
Find useful and relevant information for your journey from Ontario to California. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Ontario to California
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to California by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to California by cabin class
Find flights from Ontario to California, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and California flights
Browse other Ontario and California flight options. Last updated on June 25, 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 6 airlines flying from Ontario to California
Discover the top 6 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 25, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$135 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$78 | Average$197 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$91 | Average$248 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$107 | Average$506 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$125 | Average$319 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$153 | Average$188 | FlexibilityNo cancel fee | On-time62% |