$46+ Cheap flights from Ontario (ONT) to California
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/27. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Jun 9 — Jun 161
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 May 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 May 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 5/283:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
Mon 6/16:22 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 5/5![Frontier logo]()
$74
This Frontier deal was found by Cheapflights users on 5/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/133:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 8/156:46 pm
LAS
- ONT
Nonstop1h 07m
Frontier
Deal found 5/6![Frontier logo]()
$75
This Frontier deal was found by Cheapflights users on 5/9. 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.
Sat 9/53:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Thu 9/109:10 am
LAS
- ONT
Nonstop1h 11m
Frontier
Deal found 5/9![Frontier logo]()
$76
This Super.com deal was found by Cheapflights users on 5/10. 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.
Sat 6/63:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
Sat 6/131:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 5/10![Frontier logo]()
$86
This Trip.com deal was found by Cheapflights users on 5/8. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1311:43 am
ONT
- LAS
Nonstop1h 10m
Frontier
Mon 8/176:46 pm
LAS
- ONT
Nonstop1h 07m
Frontier
Deal found 5/8![Frontier logo]()
$97
This Kiwi.com deal was found by Cheapflights users on 5/7. 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.
Wed 5/278:59 am
ONT
- LAS
1 stop10h 20m
Frontier
Sat 5/307:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 5/7![Frontier logo]()
$98
This Kiwi.com deal was found by Cheapflights users on 5/7. 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.
Sat 5/308:59 am
ONT
- LAS
1 stop13h 31m
Frontier
Mon 6/11:59 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 5/7![Frontier logo]()
$99
This Super.com deal was found by Cheapflights users on 5/9. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/3111:51 am
ONT
- LAS
Nonstop1h 11m
Frontier
Tue 6/22:32 pm
LAS
- ONT
Nonstop1h 12m
Frontier
Deal found 5/9![Frontier logo]()
$102
This Super.com deal was found by Cheapflights users on 5/9. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/91:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Fri 6/121:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 5/9![Frontier logo]()
$103
This Super.com deal was found by Cheapflights users on 5/6. 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.
Tue 7/148:39 pm
ONT
- SFO
Nonstop1h 30m
Frontier
Tue 7/2111:10 am
SFO
- ONT
Nonstop1h 33m
Frontier
Deal found 5/6![Frontier logo]()
$109
This Frontier deal was found by Cheapflights users on 5/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/178:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Tue 6/2311:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 5/6![Frontier logo]()
$110
This Frontier deal was found by Cheapflights users on 5/8. 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.
Tue 9/18:33 pm
ONT
- SFO
Nonstop1h 32m
Frontier
Tue 9/811:12 am
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 5/8![Frontier logo]()
$111
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 May 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 May 10, 2026.
This Southwest deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 5/2612:30 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Tue 5/266:25 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 5/5![Southwest logo]()
$137
This Alaska Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/33:35 pm
ONT
- STS
Nonstop1h 29m
Alaska Airlines
Fri 6/124:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/5![Alaska Airlines logo]()
$177
This United Airlines deal was found by Cheapflights users on 5/6. 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 6/41:50 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
Mon 6/89:00 pm
SFO
- ONT
Nonstop1h 37m
United Airlines
Deal found 5/6![United Airlines logo]()
$247
This Delta deal was found by Cheapflights users on 5/6. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/125:21 pm
ONT
- RNO
1 stop6h 28m
Delta
Tue 6/165:45 pm
RNO
- ONT
1 stop6h 04m
Delta
Deal found 5/6![Delta logo]()
$277
This Kiwi.com deal was found by Cheapflights users on 5/9. 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.
Fri 6/58:17 pm
ONT
- FAT
2 stops16h 59m
Multiple Airlines
Sun 6/71:06 pm
FAT
- ONT
1 stop6h 26m
Multiple Airlines
Deal found 5/9![Multiple Airlines logo]()
$326
This Southwest deal was found by Cheapflights users on 5/7. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/35:45 am
ONT
- LAS
1 stop3h 30m
Southwest
Thu 6/46:10 am
LAS
- ONT
1 stop4h 20m
Southwest
Deal found 5/7![Southwest logo]()
$177
This Alaska Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/53:35 pm
ONT
- STS
Nonstop1h 29m
Alaska Airlines
Tue 6/95:44 pm
STS
- ONT
Nonstop1h 24m
Alaska Airlines
Deal found 5/5![Alaska Airlines logo]()
$197
This Southwest deal was found by Cheapflights users on 5/8. 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 5/309:25 am
ONT
- LAS
2 stops6h 15m
Southwest
Mon 6/17:35 pm
LAS
- ONT
Nonstop1h 05m
Southwest
Deal found 5/8![Southwest logo]()
$192
This Alaska Airlines deal was found by Cheapflights users on 5/9. 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.
Tue 6/23:35 pm
ONT
- STS
Nonstop1h 29m
Alaska Airlines
Wed 6/35:44 pm
STS
- ONT
Nonstop1h 24m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$197
This Southwest deal was found by Cheapflights users on 5/9. 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.
Mon 6/16:00 pm
ONT
- LAS
1 stop4h 05m
Southwest
Mon 6/84:55 pm
LAS
- ONT
1 stop5h 15m
Southwest
Deal found 5/9![Southwest logo]()
$197
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 5/286:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Mon 6/19:00 pm
SFO
- ONT
Nonstop1h 37m
United Airlines
Deal found 5/5![United Airlines logo]()
$247
This United Airlines deal was found by Cheapflights users on 5/9. 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.
Sat 6/66:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Mon 6/810:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 5/9![United Airlines logo]()
$248
This Alaska Airlines deal was found by Cheapflights users on 5/8. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/266:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sat 6/274:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/8![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 5/9. 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 8/76:10 am
ONT
- LAS
2 stops5h 15m
Southwest
Tue 8/117:50 am
LAS
- ONT
Nonstop1h 05m
Southwest
Deal found 5/9![Southwest logo]()
$208
This Delta deal was found by Cheapflights users on 5/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/24:57 pm
ONT
- RNO
1 stop6h 28m
Delta
Thu 6/45:13 pm
RNO
- ONT
1 stop6h 21m
Delta
Deal found 5/9![Delta logo]()
$277
This Alaska Airlines deal was found by Cheapflights users on 5/8. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/116:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sun 6/144:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/8![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 5/9. 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 6/245:45 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Tue 7/141:00 pm
SJC
- ONT
2 stops7h 00m
Southwest
Deal found 5/9![Southwest logo]()
$213
This United Airlines deal was found by Cheapflights users on 5/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/41:50 pm
ONT
- SMF
1 stop4h 26m
United Airlines
Sun 6/76:00 am
SMF
- ONT
1 stop6h 12m
United Airlines
Deal found 5/7![United Airlines logo]()
$266
This Southwest deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/308:25 pm
ONT
- LAS
Nonstop1h 05m
Southwest
Fri 7/34:45 pm
LAS
- ONT
2 stops4h 45m
Southwest
Deal found 5/5![Southwest logo]()
$218
This Delta deal was found by Cheapflights users on 5/10. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/101:00 pm
ONT
- RNO
2 stops10h 32m
Delta
Sat 6/135:30 am
RNO
- ONT
1 stop6h 40m
Delta
Deal found 5/10![Delta logo]()
$320
This United Airlines deal was found by Cheapflights users on 5/9. 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 6/21:50 pm
ONT
- RNO
1 stop5h 54m
United Airlines
Thu 6/118:00 am
RNO
- ONT
1 stop4h 12m
United Airlines
Deal found 5/9![United Airlines logo]()
$277
This Alaska Airlines deal was found by Cheapflights users on 5/9. 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.
Thu 7/236:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sun 7/264:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/9![Alaska Airlines logo]()
$257
This Delta deal was found by Cheapflights users on 5/6. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/284:57 pm
ONT
- RNO
1 stop6h 28m
Delta
Mon 6/16:00 am
RNO
- ONT
1 stop6h 19m
Delta
Deal found 5/6![Delta logo]()
$329
This Southwest deal was found by Cheapflights users on 5/7. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/124:50 pm
ONT
- LAS
2 stops5h 15m
Southwest
Tue 7/143:20 pm
LAS
- ONT
1 stop4h 40m
Southwest
Deal found 5/7![Southwest logo]()
$228
This United Airlines deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 8/189:01 am
ONT
- SMF
1 stop4h 05m
United Airlines
Tue 8/252:00 pm
SMF
- ONT
1 stop6h 04m
United Airlines
Deal found 5/5![United Airlines logo]()
$289
This Southwest deal was found by Cheapflights users on 5/6. 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.
Wed 7/158:55 pm
ONT
- SJC
Nonstop1h 10m
Southwest
Fri 7/174:40 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 5/6![Southwest logo]()
$228
This Alaska Airlines deal was found by Cheapflights users on 5/7. 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.
Sun 7/266:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Wed 7/294:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/7![Alaska Airlines logo]()
$287
This United Airlines deal was found by Cheapflights users on 5/7. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/286:00 am
ONT
- SMF
1 stop3h 25m
United Airlines
Mon 6/16:00 am
SMF
- ONT
1 stop6h 12m
United Airlines
Deal found 5/7![United Airlines logo]()
$295
This Southwest deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 6/24:30 pm
ONT
- OAK
1 stop6h 05m
Southwest
Tue 6/94:40 pm
OAK
- ONT
2 stops6h 20m
Southwest
Deal found 5/5![Southwest logo]()
$242
This Alaska Airlines deal was found by Cheapflights users on 5/6. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/57:41 pm
ONT
- STS
1 stop24h 05m
Alaska Airlines
Mon 6/85:44 pm
STS
- ONT
Nonstop1h 24m
Alaska Airlines
Deal found 5/6![Alaska Airlines logo]()
$300
Last-minute flights from Ontario to CaliforniaDiscover last-minute flight deals from Ontario to California. Data last updated May 10, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to California. Data last updated May 10, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 5/7. 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.
Wed 5/278:59 am
ONT
- LAS
1 stop10h 20m
Frontier
Sat 5/307:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 5/7![Frontier logo]()
$98
This Frontier deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 5/278:59 am
ONT
- SFO
Nonstop1h 39m
Frontier
Fri 5/299:34 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 5/5![Frontier logo]()
$113
This Kiwi.com deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 5/283:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
Mon 6/16:22 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 5/5![Frontier logo]()
$74
This Super.com deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 5/298:59 am
ONT
- SFO
Nonstop1h 39m
Frontier
Wed 6/311:15 am
SFO
- ONT
Nonstop1h 39m
Frontier
Deal found 5/5![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 5/7. 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.
Sat 5/308:59 am
ONT
- LAS
1 stop13h 31m
Frontier
Mon 6/11:59 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 5/7![Frontier logo]()
$99
This Super.com deal was found by Cheapflights users on 5/9. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/3111:51 am
ONT
- LAS
Nonstop1h 11m
Frontier
Tue 6/22:32 pm
LAS
- ONT
Nonstop1h 12m
Frontier
Deal found 5/9![Frontier logo]()
$102
This Super.com deal was found by Cheapflights users on 5/6. 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.
Sun 5/3111:51 am
ONT
- LAS
Nonstop1h 11m
Frontier
Thu 6/41:59 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 5/6![Frontier logo]()
$106
This Priceline deal was found by Cheapflights users on 5/6. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/43:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
Sun 8/26:46 pm
LAS
- ONT
Nonstop1h 07m
Frontier
Deal found 5/6![Frontier logo]()
$108
This Super.com deal was found by Cheapflights users on 5/10. 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.
Sat 6/63:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
Sat 6/131:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 5/10![Frontier logo]()
$86
This Frontier deal was found by Cheapflights users on 5/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/73:30 pm
ONT
- LAS
Nonstop1h 13m
Frontier
Tue 6/96:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 5/6![Frontier logo]()
$107
This Super.com deal was found by Cheapflights users on 5/9. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/91:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Fri 6/121:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 5/9![Frontier logo]()
$103
This Frontier deal was found by Cheapflights users on 5/6. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/178:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Tue 6/2311:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 5/6![Frontier logo]()
$110
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 May 10, 2026.
Search for one-way flight options from Ontario to California. Find affordable one-way fares based on user searches. Data last updated May 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/273:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 5/6![Frontier logo]()
$46
This Super.com deal was found by Cheapflights users on 5/5. Clicking the “Pick Dates” 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 8/133:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 5/5![Frontier logo]()
$47
This Frontier deal was found by Cheapflights users on 5/8. 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 9/1411:16 am
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 5/8![Frontier logo]()
$53
This Super.com deal was found by Cheapflights users on 5/9. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/161:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 5/9![Frontier logo]()
$57
This Southwest deal was found by Cheapflights users on 5/9. 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.
Tue 8/44:45 pm
ONT
- LAS
Nonstop1h 10m
Southwest
Deal found 5/9![Southwest logo]()
$59
This Southwest deal was found by Cheapflights users on 5/8. 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 6/305:45 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 5/8![Southwest logo]()
$59
This CheapOair deal was found by Cheapflights users on 5/6. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/261:39 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 5/6![Frontier logo]()
$60
This Trip.com deal was found by Cheapflights users on 5/9. 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.
Tue 6/231:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 5/9![Frontier logo]()
$61
This Super.com deal was found by Cheapflights users on 5/10. 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.
Sat 6/133:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 5/10![Frontier logo]()
$62
This Southwest deal was found by Cheapflights users on 5/9. 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.
Tue 8/44:45 pm
ONT
- SJC
1 stop3h 20m
Southwest
Deal found 5/9![Southwest logo]()
$64
This Trip.com deal was found by Cheapflights users on 5/9. 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.
Sat 7/411:58 am
ONT
- LAS
Nonstop1h 08m
Frontier
Deal found 5/9![Frontier logo]()
$66
This Super.com deal was found by Cheapflights users on 5/9. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/138:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 5/9![Frontier logo]()
$66
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 May 10, 2026.
Round-trip from | $74 (Kiwi.com) |
|---|---|
One-way from | $46 (Kiwi.com) |
Good round-trip deal | $137 or less |
Good one-way deal | $85 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 May 10, 2026.
Use the filters below to find and compare flights from Ontario to California that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Tue 5/26
12:30 pm-1:45 pm
Nonstop1h 15m
San Jose
Tue 5/26
6:25 pm-7:40 pm
Nonstop1h 15m
$137
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Wed 6/3
3:35 pm-5:04 pm
Nonstop1h 29m
Santa Rosa Sonoma County
Fri 6/12
4:35 pm-6:03 pm
Nonstop1h 28m
$177
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Wed 6/3
5:45 am-9:15 am
1 stop3h 30m
Las Vegas Harry Reid Intl
Thu 6/4
6:10 am-10:30 am
1 stop4h 20m
$177
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Sat 5/30
9:25 am-3:40 pm
2 stops6h 15m
Las Vegas Harry Reid Intl
Mon 6/1
7:35 pm-8:40 pm
Nonstop1h 05m
$192
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Fri 6/5
3:35 pm-5:04 pm
Nonstop1h 29m
Santa Rosa Sonoma County
Tue 6/9
5:44 pm-7:08 pm
Nonstop1h 24m
$197
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Tue 6/2
3:35 pm-5:04 pm
Nonstop1h 29m
Santa Rosa Sonoma County
Wed 6/3
5:44 pm-7:08 pm
Nonstop1h 24m
$197
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Mon 6/1
6:00 pm-10:05 pm
1 stop4h 05m
Las Vegas Harry Reid Intl
Mon 6/8
4:55 pm-10:10 pm
1 stop5h 15m
$197
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Fri 8/7
6:10 am-11:25 am
2 stops5h 15m
Las Vegas Harry Reid Intl
Tue 8/11
7:50 am-8:55 am
Nonstop1h 05m
$208
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Wed 6/24
5:45 pm-7:00 pm
Nonstop1h 15m
San Jose
Tue 7/14
1:00 pm-8:00 pm
2 stops7h 00m
$213
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Tue 6/30
8:25 pm-9:30 pm
Nonstop1h 05m
Las Vegas Harry Reid Intl
Fri 7/3
4:45 pm-9:30 pm
2 stops4h 45m
$218
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-SJC
ONT-SFO
ONT-STS
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-SFO
ONT-STS
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 month to book a flight from Ontario to California?
Currently, August is the cheapest month in which you can book a flight from Ontario to California (average of $31). Flying from Ontario to California in April is currently the most expensive (average of $702). 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 May 10, 2026.
Unlike in the morning, 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.
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 9, 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 at noon 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 May 10, 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
Entertainment
7.0
Overall
7.9
Crew
8.5
Food
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Overall
7.9
Crew
8.5
Food
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Overall
7.9
Crew
8.5
Food
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Overall
7.9
Crew
8.5
Food
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Overall
7.9
Crew
8.5
Food
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Boarding
8.1
Comfort
7.8
Entertainment
7.0
Overall
7.9
Crew
8.5
Food
7.0
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.
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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 May 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 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 May 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$136 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$77 | Average$241 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$78 | Average$172 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$123 | Average$306 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$153 | Average$169 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$236 | Average$416 | FlexibilityNo cancel fee | On-time71% |