$29+ 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 3/24. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Mar 12 — Mar 191
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 February 10, 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 February 10, 2026.
This Mytrip deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/53:24 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Mon 3/97:00 am
LAS
- ONT
Nonstop1h 06m
Frontier
Deal found 2/10![Frontier logo]()
$59
This Frontier deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/210:27 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Tue 4/71:14 pm
LAS
- ONT
Nonstop1h 12m
Frontier
Deal found 2/7![Frontier logo]()
$60
This Frontier deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/168:59 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Mon 4/206:59 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 2/9![Frontier logo]()
$61
This CheapOair deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/279:43 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Wed 3/45:12 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 2/7![Frontier logo]()
$62
This Super.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/2510:03 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Wed 4/17:55 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 2/7![Frontier logo]()
$64
This Frontier deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/13:24 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sun 3/18:21 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 2/7![Frontier logo]()
$68
This Super.com deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 4/257:18 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Mon 4/276:59 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 2/6![Frontier logo]()
$69
This CheapOair deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1311:10 am
ONT
- LAS
Nonstop1h 15m
Frontier
Mon 4/137:02 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 2/7![Frontier logo]()
$70
This Super.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/122:44 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Thu 5/147:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 2/10![Frontier logo]()
$72
This Frontier deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/208:59 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Tue 4/215:26 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 2/8![Frontier logo]()
$73
This Frontier deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/1911:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Wed 4/225:26 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 2/9![Frontier logo]()
$74
This Frontier deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3011:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Thu 4/306:59 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 2/9![Frontier logo]()
$75
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 February 10, 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 February 10, 2026.
This Southwest deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/117:05 am
ONT
- SJC
1 stop4h 05m
Southwest
Wed 3/1812:30 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 2/9![Southwest logo]()
$107
This CheapOair deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/84:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Sat 4/112:12 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Deal found 2/9![Alaska Airlines logo]()
$117
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/36:10 am
ONT
- SFO
Nonstop1h 33m
United Airlines
Tue 3/1010:50 am
SFO
- ONT
Nonstop1h 28m
United Airlines
Deal found 2/9![United Airlines logo]()
$157
This Kiwi.com deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/211:44 am
ONT
- RNO
1 stop7h 58m
Multiple Airlines
Thu 5/72:44 pm
RNO
- ONT
1 stop5h 20m
Multiple Airlines
Deal found 2/8![Multiple Airlines logo]()
$175
This Frontier deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/53:24 pm
ONT
- RNO
1 stop4h 20m
Frontier
Mon 3/92:41 pm
RNO
- ONT
1 stop22h 47m
Frontier
Deal found 2/8![Frontier logo]()
$200
This Delta deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/286:00 am
ONT
- SMF
1 stop6h 06m
Delta
Tue 3/39:55 am
SMF
- ONT
1 stop6h 07m
Delta
Deal found 2/7![Delta logo]()
$225
This Expedia deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/214:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Tue 3/242:12 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Deal found 2/9![Alaska Airlines logo]()
$117
This CheapOair deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/24:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Wed 4/82:12 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Deal found 2/7![Alaska Airlines logo]()
$117
This Kiwi.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/94:02 pm
ONT
- MFR
1 stop7h 57m
Hawaiian Airlines
Mon 3/1612:38 pm
MFR
- ONT
1 stop4h 36m
Hawaiian Airlines
Deal found 2/7![Hawaiian Airlines logo]()
$259
This Southwest deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/117:00 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Thu 3/126:20 am
SJC
- ONT
1 stop4h 05m
Southwest
Deal found 2/9![Southwest logo]()
$144
This Alaska Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/194:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Sun 3/222:18 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Deal found 2/7![Alaska Airlines logo]()
$127
This United Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/316:00 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Wed 4/14:10 pm
SFO
- ONT
Nonstop1h 37m
United Airlines
Deal found 2/8![United Airlines logo]()
$157
This Alaska Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/174:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Mon 4/202:12 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Deal found 2/7![Alaska Airlines logo]()
$137
This United Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/221:27 pm
ONT
- LAS
1 stop5h 14m
United Airlines
Sat 4/256:00 pm
LAS
- ONT
1 stop4h 45m
United Airlines
Deal found 2/8![United Airlines logo]()
$170
This Southwest deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 3/96:30 pm
ONT
- LAS
Nonstop1h 05m
Southwest
Wed 3/113:20 pm
LAS
- ONT
Nonstop1h 10m
Southwest
Deal found 2/6![Southwest logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/82:06 pm
ONT
- RNO
1 stop20h 34m
Multiple Airlines
Tue 3/1011:35 am
RNO
- ONT
2 stops12h 24m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$195
This Alaska Airlines deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/194:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Sun 3/292:18 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Deal found 2/7![Alaska Airlines logo]()
$137
This United Airlines deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” 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 3/126:37 pm
ONT
- SFO
Nonstop1h 33m
United Airlines
Tue 3/179:30 pm
SFO
- ONT
Nonstop1h 27m
United Airlines
Deal found 2/6![United Airlines logo]()
$171
This Southwest deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/29:25 am
ONT
- LAS
2 stops6h 15m
Southwest
Tue 5/511:35 am
LAS
- ONT
1 stop3h 30m
Southwest
Deal found 2/8![Southwest logo]()
$179
This CheapOair deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/24:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Sun 4/52:18 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Deal found 2/9![Alaska Airlines logo]()
$137
This Delta deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/126:00 am
ONT
- MFR
1 stop5h 57m
Delta
Tue 3/176:00 am
MFR
- ONT
1 stop5h 18m
Delta
Deal found 2/7![Delta logo]()
$230
This CheapOair deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/69:44 pm
ONT
- RNO
1 stop17h 15m
Frontier
Tue 3/103:44 pm
RNO
- ONT
1 stop21h 44m
Frontier
Deal found 2/7![Frontier logo]()
$240
This Southwest deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/219:45 pm
ONT
- LAS
Nonstop1h 05m
Southwest
Mon 3/236:05 pm
LAS
- ONT
1 stop4h 20m
Southwest
Deal found 2/8![Southwest logo]()
$181
This Alaska Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/44:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Sun 4/52:18 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Deal found 2/9![Alaska Airlines logo]()
$137
This United Airlines deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 3/286:37 pm
ONT
- SFO
Nonstop1h 33m
United Airlines
Tue 4/78:25 am
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 2/8![United Airlines logo]()
$194
This Delta deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/255:09 pm
ONT
- RNO
1 stop6h 26m
Delta
Thu 3/265:19 pm
RNO
- ONT
1 stop6h 32m
Delta
Deal found 2/8![Delta logo]()
$237
This Southwest deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/2310:35 am
ONT
- SJC
Nonstop1h 15m
Southwest
Sat 3/286:15 pm
SJC
- ONT
1 stop5h 50m
Southwest
Deal found 2/8![Southwest logo]()
$181
This United Airlines deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/196:37 pm
ONT
- SFO
Nonstop1h 33m
United Airlines
Tue 3/314:25 pm
SFO
- ONT
Nonstop1h 37m
United Airlines
Deal found 2/9![United Airlines logo]()
$194
This Kiwi.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/122:06 pm
ONT
- MRY
1 stop6h 38m
Multiple Airlines
Thu 3/199:34 pm
MRY
- ONT
1 stop10h 32m
Multiple Airlines
Deal found 2/10![Multiple Airlines logo]()
$271
This Southwest deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/206:25 am
ONT
- SJC
Nonstop1h 20m
Southwest
Tue 3/247:50 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 2/9![Southwest logo]()
$188
Last-minute flights from Ontario to CaliforniaDiscover last-minute flight deals from Ontario to California. Data last updated February 10, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to California. Data last updated February 10, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/197:22 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Sun 3/18:21 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 2/7![Frontier logo]()
$76
This Super.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/263:24 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sun 3/112:00 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Deal found 2/7![Frontier logo]()
$78
This Kiwi.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/279:43 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Sat 2/2812:00 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Deal found 2/7![Frontier logo]()
$61
This CheapOair deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/279:43 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Wed 3/45:12 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 2/7![Frontier logo]()
$62
This Frontier deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/13:24 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sun 3/18:21 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 2/7![Frontier logo]()
$68
This Gotogate deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/57:22 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Mon 3/97:00 am
LAS
- ONT
Nonstop1h 06m
Frontier
Deal found 2/7![Frontier logo]()
$59
This Southwest deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/116:45 am
ONT
- SJC
Nonstop1h 15m
Southwest
Wed 3/187:25 am
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 2/9![Southwest logo]()
$97
This Super.com deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/122:06 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Sat 3/1412:17 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Deal found 2/10![Frontier logo]()
$73
This Mytrip deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/122:06 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Thu 3/1912:00 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Deal found 2/10![Frontier logo]()
$74
This CheapOair deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/194:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Mon 3/232:12 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Deal found 2/7![Alaska Airlines logo]()
$117
This Super.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/2510:03 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Wed 4/17:55 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 2/7![Frontier logo]()
$64
This Booking.com deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/309:49 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Wed 4/17:55 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 2/8![Frontier logo]()
$60
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 February 10, 2026.
Search for one-way flight options from Ontario to California. Find affordable one-way fares based on user searches. Data last updated February 10, 2026.
This Frontier deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/242:23 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Deal found 2/10![Frontier logo]()
$29
This Frontier deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/112:23 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Deal found 2/10![Frontier logo]()
$30
This Frontier deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/118:19 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 2/10![Frontier logo]()
$31
This Trip.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/208:59 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 2/9![Frontier logo]()
$32
This Super.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/279:43 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 2/7![Frontier logo]()
$33
This Super.com deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/278:59 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 2/8![Frontier logo]()
$34
This Expedia deal was found by Cheapflights users on 2/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/168:59 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 2/6![Frontier logo]()
$35
This Frontier deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/157:29 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 2/7![Frontier logo]()
$36
This Kiwi.com deal was found by Cheapflights users on 2/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/911:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Deal found 2/9![Frontier logo]()
$38
This Kiwi.com deal was found by Cheapflights users on 2/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/78:59 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 2/7![Frontier logo]()
$43
This Frontier deal was found by Cheapflights users on 2/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/257:18 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 2/10![Frontier logo]()
$45
This Southwest deal was found by Cheapflights users on 2/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/712:30 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 2/8![Southwest logo]()
$49
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 February 10, 2026.
Round-trip from | $59 (Mytrip) |
|---|---|
One-way from | $29 (Frontier) |
Good round-trip deal | $157 or less |
Good one-way deal | $137 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 February 10, 2026.
Use the filters below to find and compare flights from Ontario to California that are best for you.
Fly from
Ontario
Fly to
California
Route
Depart
Return
Price
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Wed 3/11
7:05 am-11:10 am
1 stop4h 05m
San Jose
Wed 3/18
12:30 pm-1:45 pm
Nonstop1h 15m
$107
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Wed 4/8
4:22 pm-6:22 pm
Nonstop2h 00m
Santa Rosa Sonoma County
Sat 4/11
2:12 pm-3:42 pm
Nonstop1h 30m
$117
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Sat 3/21
4:22 pm-6:22 pm
Nonstop2h 00m
Santa Rosa Sonoma County
Tue 3/24
2:12 pm-3:42 pm
Nonstop1h 30m
$117
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Thu 4/2
4:22 pm-6:22 pm
Nonstop2h 00m
Santa Rosa Sonoma County
Wed 4/8
2:12 pm-3:42 pm
Nonstop1h 30m
$117
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Thu 3/19
4:22 pm-6:22 pm
Nonstop2h 00m
Santa Rosa Sonoma County
Sun 3/22
2:18 pm-3:48 pm
Nonstop1h 30m
$127
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Fri 4/17
4:22 pm-6:22 pm
Nonstop2h 00m
Santa Rosa Sonoma County
Mon 4/20
2:12 pm-3:42 pm
Nonstop1h 30m
$137
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Thu 3/19
4:22 pm-6:22 pm
Nonstop2h 00m
Santa Rosa Sonoma County
Sun 3/29
2:18 pm-3:48 pm
Nonstop1h 30m
$137
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Thu 4/2
4:22 pm-6:22 pm
Nonstop2h 00m
Santa Rosa Sonoma County
Sun 4/5
2:18 pm-3:48 pm
Nonstop1h 30m
$137
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Sat 4/4
4:22 pm-6:22 pm
Nonstop2h 00m
Santa Rosa Sonoma County
Sun 4/5
2:18 pm-3:48 pm
Nonstop1h 30m
$137
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Wed 3/11
7:00 pm-8:15 pm
Nonstop1h 15m
San Jose
Thu 3/12
6:20 am-10:25 am
1 stop4h 05m
$144
Showing 1-10 of 60 results
Best time to book a flight from Ontario to California
Have a flexible travel schedule? Discover the best time to fly to California from Ontario with our price prediction graph.
ONT-LAS
ONT-SJC
ONT-STS
ONT-SFO
ONT-RNO
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Ontario to California
ONT-USCA
ONT-LAS
ONT-SJC
ONT-STS
ONT-SFO
What is the cheapest month to book a flight from Ontario to California?
Currently, March is the cheapest month in which you can book a flight from Ontario to California (average of $31). Flying from Ontario to California in October is currently the most expensive (average of $58). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from ONT to CA?
Find hourly flight availability from Ontario to California. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated February 10, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 23% on flights from Ontario to California by exploring options for tickets in the evening.
What is the cheapest day to fly from Ontario to California?
Use this chart to determine the cheapest time to fly round-trip from Ontario to California. Price data was last updated on February 7, 2026.
Travelers seeking maximum savings on their Ontario to California flight should consider departing on Saturday 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 February 10, 2026.
Get a feel of what it's like to fly with Alaska Airlines, Southwest, and United 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.
Comfort
7.8
Crew
8.5
Boarding
8.1
Entertainment
7.0
Food
7.1
Overall
8.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Comfort
7.8
Crew
8.5
Boarding
8.1
Entertainment
7.0
Food
7.1
Overall
8.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Comfort
7.8
Crew
8.5
Boarding
8.1
Entertainment
7.0
Food
7.1
Overall
8.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Comfort
7.8
Crew
8.5
Boarding
8.1
Entertainment
7.0
Food
7.1
Overall
8.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Comfort
7.8
Crew
8.5
Boarding
8.1
Entertainment
7.0
Food
7.1
Overall
8.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Comfort
7.8
Crew
8.5
Boarding
8.1
Entertainment
7.0
Food
7.1
Overall
8.0
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
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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 February 10, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to California flights
Consider these flights traveling from Ontario to California.
Top 4 airlines flying from Ontario to California
Discover the top 4 airlines that operate flights from Ontario to California. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated February 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$32 | Average$125 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$58 | Average$186 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$67 | Average$173 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$97 | Average$275 | FlexibilityNo cancel fee | On-time63% |