$35+ Cheap flights from Ontario (ONT) to California
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/1. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
giu 25 — lug 21
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to California with Cheapflights
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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 maggio 26, 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 maggio 26, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/22. 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.
mer 7/291:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
mer 8/127:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 5/22![Frontier logo]()
$74
This Kiwi.com deal was found by Cheapflights users on 5/22. 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.
mer 7/221:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
mer 7/297:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 5/22![Frontier logo]()
$76
This Frontier deal was found by Cheapflights users on 5/23. 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.
mer 9/92:58 pm
ONT
- LAS
Nonstop1h 10m
Frontier
mer 9/163:00 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 5/23![Frontier logo]()
$77
This Frontier deal was found by Cheapflights users on 5/23. 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.
mer 6/171:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
mer 6/176:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 5/23![Frontier logo]()
$83
This Frontier deal was found by Cheapflights users on 5/22. 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.
mer 6/241:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
mer 6/246:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 5/22![Frontier logo]()
$84
This Kiwi.com deal was found by Cheapflights users on 5/22. 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.
sab 9/53:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
mar 9/86:40 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 5/22![Frontier logo]()
$86
This Frontier deal was found by Cheapflights users on 5/25. 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.
mer 8/263:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
sab 8/291:56 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 5/25![Frontier logo]()
$87
This Frontier deal was found by Cheapflights users on 5/23. 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.
mar 6/301:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
mer 7/16:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 5/23![Frontier logo]()
$88
This Frontier deal was found by Cheapflights users on 5/23. 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.
mer 6/243:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
mar 6/301:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 5/23![Frontier logo]()
$89
This Trip.com deal was found by Cheapflights users on 5/24. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar 8/181:27 pm
ONT
- LAS
Nonstop1h 11m
Frontier
sab 8/226:40 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 5/24![Frontier logo]()
$91
This Travelocity deal was found by Cheapflights users on 5/23. 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 Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar 8/251:27 pm
ONT
- LAS
Nonstop1h 11m
Frontier
sab 8/296:40 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 5/23![Frontier logo]()
$97
This Super.com deal was found by Cheapflights users on 5/23. 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.
sab 8/153:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
mer 8/196:40 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 5/23![Frontier logo]()
$98
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 maggio 26, 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 maggio 26, 2026.
This Southwest deal was found by Cheapflights users on 5/24. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 6/246:35 pm
ONT
- SFO
1 stop4h 40m
Southwest
mar 6/305:00 am
SFO
- ONT
1 stop4h 15m
Southwest
Deal found 5/24![Southwest logo]()
$157
This Alaska Airlines deal was found by Cheapflights users on 5/25. 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.
sab 8/224:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
dom 8/232:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 5/25![Alaska Airlines logo]()
$202
This United Airlines deal was found by Cheapflights users on 5/21. 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.
sab 8/221:56 pm
ONT
- LAS
1 stop6h 36m
United Airlines
dom 8/236:00 am
LAS
- ONT
1 stop6h 12m
United Airlines
Deal found 5/21![United Airlines logo]()
$243
This Southwest deal was found by Cheapflights users on 5/25. 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.
mar 7/145:15 am
ONT
- SFO
1 stop6h 20m
Southwest
mer 7/1510:25 am
SFO
- ONT
1 stop5h 05m
Southwest
Deal found 5/25![Southwest logo]()
$157
This Southwest deal was found by Cheapflights users on 5/21. 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.
mer 7/157:20 pm
ONT
- SFO
1 stop4h 05m
Southwest
mer 7/226:00 am
SFO
- ONT
2 stops8h 05m
Southwest
Deal found 5/21![Southwest logo]()
$162
This Delta deal was found by Cheapflights users on 5/24. 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.
mer 7/225:10 pm
ONT
- RNO
1 stop6h 37m
Delta
ven 7/245:30 am
RNO
- ONT
1 stop6h 40m
Delta
Deal found 5/24![Delta logo]()
$365
This Alaska Airlines deal was found by Cheapflights users on 5/21. 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.
sab 6/276:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
dom 6/284:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/21![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 5/23. 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.
mer 7/112:05 pm
ONT
- SJC
Nonstop1h 10m
Southwest
gio 7/26:25 am
SJC
- ONT
1 stop4h 55m
Southwest
Deal found 5/23![Southwest logo]()
$197
This Alaska Airlines deal was found by Cheapflights users on 5/21. 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.
gio 6/256:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
mer 7/14:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/21![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 5/25. 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.
mar 7/74:35 pm
ONT
- SJC
2 stops5h 55m
Southwest
gio 7/98:15 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 5/25![Southwest logo]()
$202
This Alaska Airlines deal was found by Cheapflights users on 5/24. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven 7/106:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
dom 7/124:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/24![Alaska Airlines logo]()
$227
This United Airlines deal was found by Cheapflights users on 5/24. 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.
ven 9/119:01 am
ONT
- SFO
Nonstop1h 29m
United Airlines
mer 9/164:45 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 5/24![United Airlines logo]()
$288
This Alaska Airlines deal was found by Cheapflights users on 5/21. 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.
mer 6/246:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
mer 7/14:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/21![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 5/24. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar 6/236:35 pm
ONT
- LAS
Nonstop1h 05m
Southwest
ven 6/269:05 am
LAS
- ONT
Nonstop1h 05m
Southwest
Deal found 5/24![Southwest logo]()
$213
This Alaska Airlines deal was found by Cheapflights users on 5/22. 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.
lun 6/156:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
lun 6/224:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/22![Alaska Airlines logo]()
$227
This United Airlines deal was found by Cheapflights users on 5/24. 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.
gio 6/186:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
lun 6/2210:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 5/24![United Airlines logo]()
$307
This Southwest deal was found by Cheapflights users on 5/24. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun 7/138:35 am
ONT
- LAS
Nonstop1h 05m
Southwest
mer 7/158:00 am
LAS
- ONT
Nonstop1h 05m
Southwest
Deal found 5/24![Southwest logo]()
$213
This Alaska Airlines deal was found by Cheapflights users on 5/21. 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.
mar 6/236:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
sab 6/274:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/21![Alaska Airlines logo]()
$227
This Delta deal was found by Cheapflights users on 5/24. 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.
gio 7/165:10 pm
ONT
- RNO
1 stop6h 37m
Delta
dom 7/195:30 am
RNO
- ONT
1 stop6h 40m
Delta
Deal found 5/24![Delta logo]()
$372
This Southwest deal was found by Cheapflights users on 5/25. 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.
mer 7/15:15 am
ONT
- LAS
1 stop3h 15m
Southwest
mer 7/14:20 pm
LAS
- ONT
1 stop5h 45m
Southwest
Deal found 5/25![Southwest logo]()
$214
This Alaska Airlines deal was found by Cheapflights users on 5/24. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven 7/36:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
sab 7/44:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/24![Alaska Airlines logo]()
$227
This United Airlines deal was found by Cheapflights users on 5/23. 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.
sab 6/66:39 pm
ONT
- MRY
1 stop5h 08m
United Airlines
dom 6/148:00 am
MRY
- ONT
1 stop4h 12m
United Airlines
Deal found 5/23![United Airlines logo]()
$364
This Alaska Airlines deal was found by Cheapflights users on 5/21. 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.
mar 6/236:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
lun 6/294:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/21![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 5/24. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sab 7/254:55 pm
ONT
- SJC
Nonstop1h 15m
Southwest
sab 7/258:40 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 5/24![Southwest logo]()
$237
This United Airlines deal was found by Cheapflights users on 5/24. 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.
ven 6/126:00 am
ONT
- MRY
1 stop5h 10m
United Airlines
dom 6/148:00 am
MRY
- ONT
1 stop4h 12m
United Airlines
Deal found 5/24![United Airlines logo]()
$364
This Alaska Airlines deal was found by Cheapflights users on 5/23. 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.
gio 7/26:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
dom 7/54:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/23![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 5/21. 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.
mer 7/16:35 pm
ONT
- SJC
1 stop4h 25m
Southwest
dom 7/57:30 pm
SJC
- ONT
1 stop4h 35m
Southwest
Deal found 5/21![Southwest logo]()
$238
This Alaska Airlines deal was found by Cheapflights users on 5/25. 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.
mer 6/176:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
sab 6/204:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/25![Alaska Airlines logo]()
$227
This Delta deal was found by Cheapflights users on 5/22. 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.
ven 5/296:45 am
ONT
- MFR
1 stop6h 15m
Delta
dom 5/316:15 am
MFR
- ONT
1 stop6h 20m
Delta
Deal found 5/22![Delta logo]()
$503
This United Airlines deal was found by Cheapflights users on 5/25. 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.
gio 7/26:39 pm
ONT
- MRY
1 stop5h 08m
United Airlines
sab 7/412:00 pm
MRY
- ONT
1 stop6h 33m
United Airlines
Deal found 5/25![United Airlines logo]()
$384
Last-minute flights from Ontario to CaliforniaDiscover last-minute flight deals from Ontario to California. Data last updated maggio 26, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to California. Data last updated maggio 26, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 5/23. 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.
sab 6/138:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
mar 6/1611:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 5/23![Frontier logo]()
$127
This Frontier deal was found by Cheapflights users on 5/23. 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.
sab 6/138:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
mar 6/2311:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 5/23![Frontier logo]()
$128
This CheapOair deal was found by Cheapflights users on 5/23. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer 6/173:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
mer 6/241:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 5/23![Frontier logo]()
$76
This Frontier deal was found by Cheapflights users on 5/23. 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.
mer 6/171:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
mer 6/176:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 5/23![Frontier logo]()
$83
This Frontier deal was found by Cheapflights users on 5/25. 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.
mer 6/178:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
gio 6/189:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 5/25![Frontier logo]()
$117
This Kissandfly.com deal was found by Cheapflights users on 5/24. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
gio 6/188:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
lun 6/229:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 5/24![Frontier logo]()
$129
This Super.com deal was found by Cheapflights users on 5/26. Clicking the “Pick Dates” 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.
sab 6/208:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
mar 6/2311:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 5/26![Frontier logo]()
$116
This Kissandfly.com deal was found by Cheapflights users on 5/24. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sab 6/2011:58 am
ONT
- LAS
Nonstop1h 08m
Frontier
mar 6/231:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 5/24![Frontier logo]()
$124
This Kissandfly.com deal was found by Cheapflights users on 5/25. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sab 6/203:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
lun 6/221:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 5/25![Frontier logo]()
$129
This Frontier deal was found by Cheapflights users on 5/22. 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.
mer 6/241:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
mer 6/246:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 5/22![Frontier logo]()
$84
This Frontier deal was found by Cheapflights users on 5/23. 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.
mer 6/243:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
mar 6/301:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 5/23![Frontier logo]()
$89
This Frontier deal was found by Cheapflights users on 5/23. 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.
mar 6/301:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
mer 7/16:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 5/23![Frontier logo]()
$88
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 maggio 26, 2026.
Search for one-way flight options from Ontario to California. Find affordable one-way fares based on user searches. Data last updated maggio 26, 2026.
This Trip.com deal was found by Cheapflights users on 5/22. 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.
mer 7/11:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 5/22![Frontier logo]()
$35
This Super.com deal was found by Cheapflights users on 5/23. 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.
mar 6/163:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 5/23![Frontier logo]()
$44
This Frontier deal was found by Cheapflights users on 5/22. 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.
mer 6/173:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 5/22![Frontier logo]()
$45
This CheapOair deal was found by Cheapflights users on 5/25. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sab 8/153:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 5/25![Frontier logo]()
$54
This Super.com deal was found by Cheapflights users on 5/23. 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.
gio 8/203:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 5/23![Frontier logo]()
$56
This Trip.com deal was found by Cheapflights users on 5/23. 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.
gio 8/133:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 5/23![Frontier logo]()
$59
This CheapOair deal was found by Cheapflights users on 5/21. 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.
lun 8/108:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 5/21![Frontier logo]()
$65
This Frontier deal was found by Cheapflights users on 5/25. 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.
mer 7/298:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 5/25![Frontier logo]()
$66
This Kissandfly.com deal was found by Cheapflights users on 5/25. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun 6/153:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 5/25![Frontier logo]()
$67
This Kissandfly.com deal was found by Cheapflights users on 5/25. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun 6/158:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 5/25![Frontier logo]()
$67
This Southwest deal was found by Cheapflights users on 5/25. 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.
mer 6/176:35 pm
ONT
- LAS
Nonstop1h 05m
Southwest
Deal found 5/25![Southwest logo]()
$69
This United Airlines deal was found by Cheapflights users on 5/21. 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.
mer 6/176:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Deal found 5/21![United Airlines logo]()
$69
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 maggio 26, 2026.
Round-trip from | $74 (Kiwi.com) |
|---|---|
One-way from | $35 (Trip.com) |
Good round-trip deal | $157 or less |
Good one-way deal | $89 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 maggio 26, 2026.
Use the filters below to find and compare flights from Ontario to California that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
mer 6/24
6:35 pm-11:15 pm
1 stop4h 40m
San Francisco
mar 6/30
5:00 am-9:15 am
1 stop4h 15m
$157
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
mar 7/14
5:15 am-11:35 am
1 stop6h 20m
San Francisco
mer 7/15
10:25 am-3:30 pm
1 stop5h 05m
$157
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
mer 7/15
7:20 pm-11:25 pm
1 stop4h 05m
San Francisco
mer 7/22
6:00 am-2:05 pm
2 stops8h 05m
$162
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
mer 7/1
12:05 pm-1:15 pm
Nonstop1h 10m
San Jose
gio 7/2
6:25 am-11:20 am
1 stop4h 55m
$197
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
sab 8/22
4:27 pm-6:07 pm
Nonstop1h 40m
Santa Rosa Sonoma County
dom 8/23
2:09 pm-3:47 pm
Nonstop1h 38m
$202
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
mar 7/7
4:35 pm-10:30 pm
2 stops5h 55m
San Jose
gio 7/9
8:15 pm-9:35 pm
Nonstop1h 20m
$202
Quickest round-trip
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
mar 6/23
6:35 pm-7:40 pm
Nonstop1h 05m
Las Vegas Harry Reid Intl
ven 6/26
9:05 am-10:10 am
Nonstop1h 05m
$213
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
lun 7/13
8:35 am-9:40 am
Nonstop1h 05m
Las Vegas Harry Reid Intl
mer 7/15
8:00 am-9:05 am
Nonstop1h 05m
$213
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
mer 7/1
5:15 am-8:30 am
1 stop3h 15m
Las Vegas Harry Reid Intl
mer 7/1
4:20 pm-10:05 pm
1 stop5h 45m
$214
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
sab 6/27
6:43 pm-8:14 pm
Nonstop1h 31m
Santa Rosa Sonoma County
dom 6/28
4:35 pm-6:03 pm
Nonstop1h 28m
$227
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-STS
ONT-SMF
ONT-MFR
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-STS
ONT-SMF
What is the cheapest month to book a flight from Ontario to California?
Currently, April is the cheapest month in which you can book a flight from Ontario to California (average of $28). Flying from Ontario to California in October is currently the most expensive (average of $390). 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 maggio 26, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 26% 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 86 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 May 23, 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. 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 maggio 26, 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
Crew
8.5
Food
7.0
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Crew
8.5
Food
7.0
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Crew
8.5
Food
7.0
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Crew
8.5
Food
7.0
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Crew
8.5
Food
7.0
Overall
7.9
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Crew
8.5
Food
7.0
Overall
7.9
Entertainment
7.0
Comfort
7.8
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 maggio 26, 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 maggio 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$134 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$77 | Average$243 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$78 | Average$192 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$123 | Average$311 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$153 | Average$169 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$236 | Average$416 | FlexibilityNo cancel fee | On-time71% |