$33+ 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 4/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Apr 26 — May 31
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 March 27, 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 March 27, 2026.
This Super.com deal was found by Cheapflights users on 3/26. 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.
Mon 4/139:02 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Thu 4/165:46 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 3/26![Frontier logo]()
$67
This Priceline deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/139:02 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Wed 4/159:30 am
LAS
- ONT
Nonstop1h 14m
Frontier
Deal found 3/25![Frontier logo]()
$68
This Booking.com deal was found by Cheapflights users on 3/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1511:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Wed 4/155:41 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 3/25![Frontier logo]()
$69
This Priceline deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/287:44 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Fri 5/16:20 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 3/25![Frontier logo]()
$74
This Mytrip deal was found by Cheapflights users on 3/25. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:44 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Wed 5/202:32 pm
LAS
- ONT
Nonstop1h 12m
Frontier
Deal found 3/25![Frontier logo]()
$75
This Super.com deal was found by Cheapflights users on 3/25. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/54:39 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Tue 5/122:32 pm
LAS
- ONT
Nonstop1h 12m
Frontier
Deal found 3/25![Frontier logo]()
$79
This Frontier deal was found by Cheapflights users on 3/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/48:59 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Wed 5/62:32 pm
LAS
- ONT
Nonstop1h 12m
Frontier
Deal found 3/26![Frontier logo]()
$80
This Booking.com deal was found by Cheapflights users on 3/26. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/48:59 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Thu 5/76:22 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 3/26![Frontier logo]()
$81
This Kiwi.com deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2211:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Wed 4/225:41 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 3/23![Frontier logo]()
$85
This CheapOair deal was found by Cheapflights users on 3/24. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2211:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Wed 4/299:30 am
LAS
- ONT
Nonstop1h 14m
Frontier
Deal found 3/24![Frontier logo]()
$86
This Gotogate deal was found by Cheapflights users on 3/24. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/124:39 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Wed 5/136:22 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 3/24![Frontier logo]()
$87
This Priceline deal was found by Cheapflights users on 3/24. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/271:39 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Thu 5/281:59 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 3/24![Frontier logo]()
$90
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 March 27, 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 March 27, 2026.
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/255:30 am
ONT
- STS
1 stop5h 55m
Southwest
Tue 4/284:35 pm
STS
- ONT
1 stop5h 35m
Southwest
Deal found 3/22![Southwest logo]()
$151
This Kiwi.com deal was found by Cheapflights users on 3/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/2412:59 am
ONT
- SAN
1 stop22h 07m
Frontier
Sat 5/27:15 am
SAN
- ONT
1 stop16h 40m
Frontier
Deal found 3/26![Frontier logo]()
$152
This Alaska Airlines deal was found by Cheapflights users on 3/25. 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.
Tue 4/214:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Sat 4/2510:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Deal found 3/25![Alaska Airlines logo]()
$197
This United Airlines deal was found by Cheapflights users on 3/24. 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.
Thu 4/306:00 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Thu 4/304:15 pm
SFO
- ONT
Nonstop1h 37m
United Airlines
Deal found 3/24![United Airlines logo]()
$215
This Delta deal was found by Cheapflights users on 3/25. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/115:24 pm
ONT
- RNO
1 stop6h 23m
Delta
Sat 6/135:30 am
RNO
- ONT
1 stop6h 40m
Delta
Deal found 3/25![Delta logo]()
$251
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/212:25 pm
ONT
- STS
2 stops7h 45m
Southwest
Tue 4/284:35 pm
STS
- ONT
1 stop5h 35m
Southwest
Deal found 3/22![Southwest logo]()
$156
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2110:40 am
ONT
- RNO
1 stop5h 45m
Southwest
Tue 4/284:00 pm
RNO
- ONT
2 stops6h 10m
Southwest
Deal found 3/22![Southwest logo]()
$181
This Alaska Airlines deal was found by Cheapflights users on 3/23. 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.
Thu 6/256:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sun 6/284:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 3/23![Alaska Airlines logo]()
$217
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/173:00 pm
ONT
- STS
2 stops7h 40m
Southwest
Sat 4/186:05 am
STS
- ONT
2 stops6h 10m
Southwest
Deal found 3/22![Southwest logo]()
$184
This Alaska Airlines deal was found by Cheapflights users on 3/24. 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.
Fri 6/196:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sun 6/214:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 3/24![Alaska Airlines logo]()
$217
This United Airlines deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/56:00 am
ONT
- RNO
1 stop3h 30m
United Airlines
Wed 5/66:00 am
RNO
- ONT
1 stop3h 41m
United Airlines
Deal found 3/23![United Airlines logo]()
$245
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/212:10 pm
ONT
- SFO
2 stops8h 35m
Southwest
Tue 4/282:50 pm
SFO
- ONT
2 stops7h 20m
Southwest
Deal found 3/22![Southwest logo]()
$186
This Kiwi.com deal was found by Cheapflights users on 3/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/109:02 pm
ONT
- SAN
2 stops23h 24m
Frontier
Tue 4/142:12 pm
SAN
- ONT
1 stop4h 37m
Frontier
Deal found 3/26![Frontier logo]()
$259
This Delta deal was found by Cheapflights users on 3/22. 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.
Tue 5/191:29 pm
ONT
- SMF
2 stops9h 17m
Delta
Fri 5/226:59 pm
SMF
- ONT
1 stop4h 35m
Delta
Deal found 3/22![Delta logo]()
$273
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/33:30 pm
ONT
- LAS
1 stop4h 05m
Southwest
Tue 6/95:10 pm
LAS
- ONT
2 stops5h 00m
Southwest
Deal found 3/22![Southwest logo]()
$188
This United Airlines deal was found by Cheapflights users on 3/25. 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.
Wed 4/151:27 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Sat 4/254:10 pm
SFO
- ONT
Nonstop1h 37m
United Airlines
Deal found 3/25![United Airlines logo]()
$255
This Alaska Airlines deal was found by Cheapflights users on 3/26. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/176:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Mon 7/204:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 3/26![Alaska Airlines logo]()
$247
This Southwest deal was found by Cheapflights users on 3/25. 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.
Mon 5/45:05 pm
ONT
- RNO
1 stop5h 30m
Southwest
Wed 5/66:25 pm
RNO
- ONT
1 stop3h 45m
Southwest
Deal found 3/25![Southwest logo]()
$191
This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/56:00 am
ONT
- SMF
1 stop3h 47m
United Airlines
Wed 5/62:23 pm
SMF
- ONT
1 stop3h 29m
United Airlines
Deal found 3/25![United Airlines logo]()
$268
This Alaska Airlines deal was found by Cheapflights users on 3/26. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/612:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Fri 5/155:44 pm
STS
- ONT
Nonstop1h 24m
Alaska Airlines
Deal found 3/26![Alaska Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 3/25. 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.
Sat 6/61:20 pm
ONT
- LAS
1 stop5h 45m
Southwest
Tue 6/911:20 am
LAS
- ONT
1 stop5h 45m
Southwest
Deal found 3/25![Southwest logo]()
$199
This United Airlines deal was found by Cheapflights users on 3/26. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/26:00 am
ONT
- SMF
1 stop3h 47m
United Airlines
Sat 5/22:23 pm
SMF
- ONT
1 stop3h 29m
United Airlines
Deal found 3/26![United Airlines logo]()
$273
This Kiwi.com deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” 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 8/2811:43 am
ONT
- SAN
1 stop9h 15m
Frontier
Sun 8/309:53 pm
SAN
- ONT
1 stop21h 55m
Frontier
Deal found 3/27![Frontier logo]()
$333
This Alaska Airlines deal was found by Cheapflights users on 3/22. 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.
Tue 4/214:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Tue 4/281:13 pm
STS
- ONT
1 stop9h 19m
Alaska Airlines
Deal found 3/22![Alaska Airlines logo]()
$260
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/233:00 pm
ONT
- STS
2 stops7h 40m
Southwest
Fri 4/244:40 pm
STS
- ONT
2 stops6h 25m
Southwest
Deal found 3/22![Southwest logo]()
$204
This United Airlines deal was found by Cheapflights users on 3/24. 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.
Wed 4/221:34 pm
ONT
- SMF
1 stop8h 48m
United Airlines
Thu 4/2311:18 am
SMF
- ONT
1 stop6h 29m
United Airlines
Deal found 3/24![United Airlines logo]()
$273
This Kiwi.com deal was found by Cheapflights users on 3/22. 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.
Sat 4/1812:59 am
ONT
- SAN
1 stop7h 35m
Frontier
Sun 4/269:00 pm
SAN
- ONT
1 stop11h 24m
Frontier
Deal found 3/22![Frontier logo]()
$339
This United Airlines deal was found by Cheapflights users on 3/25. 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.
Fri 4/2411:05 am
ONT
- SFO
Nonstop1h 30m
United Airlines
Fri 5/19:23 pm
SFO
- ONT
Nonstop1h 36m
United Airlines
Deal found 3/25![United Airlines logo]()
$279
This Alaska Airlines deal was found by Cheapflights users on 3/23. 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.
Tue 4/2812:48 pm
ONT
- SAN
1 stop20h 22m
Alaska Airlines
Wed 4/295:17 pm
SAN
- ONT
1 stop18h 51m
Alaska Airlines
Deal found 3/23![Alaska Airlines logo]()
$282
This Southwest deal was found by Cheapflights users on 3/25. 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.
Thu 6/411:05 am
ONT
- OAK
Nonstop1h 15m
Southwest
Mon 6/87:00 pm
OAK
- ONT
Nonstop1h 20m
Southwest
Deal found 3/25![Southwest logo]()
$217
Last-minute flights from Ontario to CaliforniaDiscover last-minute flight deals from Ontario to California. Data last updated March 27, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to California. Data last updated March 27, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 3/26. 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.
Mon 4/139:02 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Thu 4/165:46 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 3/26![Frontier logo]()
$67
This Booking.com deal was found by Cheapflights users on 3/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/1511:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Wed 4/155:41 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 3/25![Frontier logo]()
$69
This Super.com deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” 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 4/167:49 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Fri 4/176:59 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 3/27![Frontier logo]()
$92
This Kiwi.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/178:59 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Thu 4/236:59 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 3/24![Frontier logo]()
$95
This Frontier deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/187:44 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Tue 4/215:41 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 3/24![Frontier logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/214:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Tue 4/2810:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Deal found 3/22![Alaska Airlines logo]()
$116
This Mytrip deal was found by Cheapflights users on 3/25. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:44 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Wed 5/202:32 pm
LAS
- ONT
Nonstop1h 12m
Frontier
Deal found 3/25![Frontier logo]()
$75
This Kiwi.com deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2211:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Wed 4/225:41 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 3/23![Frontier logo]()
$85
This CheapOair deal was found by Cheapflights users on 3/24. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2211:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Wed 4/299:30 am
LAS
- ONT
Nonstop1h 14m
Frontier
Deal found 3/24![Frontier logo]()
$86
This Kiwi.com deal was found by Cheapflights users on 3/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/249:59 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Fri 5/17:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 3/26![Frontier logo]()
$98
This Frontier deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” 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 4/2511:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Mon 4/2712:00 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 3/27![Frontier logo]()
$88
This Priceline deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/287:44 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Fri 5/16:20 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 3/25![Frontier logo]()
$74
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 March 27, 2026.
Search for one-way flight options from Ontario to California. Find affordable one-way fares based on user searches. Data last updated March 27, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/199:09 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 3/26![Frontier logo]()
$33
This CheapOair deal was found by Cheapflights users on 3/27. Clicking the “Pick Dates” 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
Deal found 3/27![Frontier logo]()
$34
This Booking.com deal was found by Cheapflights users on 3/25. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/84:52 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 3/25![Frontier logo]()
$35
This Kiwi.com deal was found by Cheapflights users on 3/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/118:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Deal found 3/26![Frontier logo]()
$39
This Super.com deal was found by Cheapflights users on 3/25. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/61:50 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 3/25![Frontier logo]()
$40
This Frontier deal was found by Cheapflights users on 3/25. 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.
Wed 6/31:39 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 3/25![Frontier logo]()
$41
This Kiwi.com deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/54:39 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 3/23![Frontier logo]()
$42
This Super.com deal was found by Cheapflights users on 3/23. 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.
Wed 4/2911:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Deal found 3/23![Frontier logo]()
$43
This Mytrip deal was found by Cheapflights users on 3/23. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/204:39 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 3/23![Frontier logo]()
$44
This iWofly deal was found by Cheapflights users on 3/25. 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1811:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Deal found 3/25![Frontier logo]()
$52
This Kiwi.com deal was found by Cheapflights users on 3/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/249:59 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 3/25![Frontier logo]()
$58
This Super.com deal was found by Cheapflights users on 3/25. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/910:27 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 3/25![Frontier logo]()
$59
Find flight deals from Ontario to California
Keep the following information in mind while searching for Ontario to California flight deals. Data was last updated March 27, 2026.
Round-trip from | $67 (Super.com) |
|---|---|
One-way from | $33 (Kiwi.com) |
Good round-trip deal | $137 or less |
Good one-way deal | $78 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 March 27, 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
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Sat 4/25
5:30 am-11:25 am
1 stop5h 55m
Santa Rosa Sonoma County
Tue 4/28
4:35 pm-10:10 pm
1 stop5h 35m
$151
OntarioSan Diego
ONT - SAN
ONTSAN
Ontario
Fri 4/24
12:59 am-11:06 pm
1 stop22h 07m
San Diego
Sat 5/2
7:15 am-11:55 pm
1 stop16h 40m
$152
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Tue 4/21
2:25 pm-10:10 pm
2 stops7h 45m
Santa Rosa Sonoma County
Tue 4/28
4:35 pm-10:10 pm
1 stop5h 35m
$156
OntarioReno
ONT - RNO
ONTRNO
Ontario
Tue 4/21
10:40 am-4:25 pm
1 stop5h 45m
Reno
Tue 4/28
4:00 pm-10:10 pm
2 stops6h 10m
$181
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Fri 4/17
3:00 pm-10:40 pm
2 stops7h 40m
Santa Rosa Sonoma County
Sat 4/18
6:05 am-12:15 pm
2 stops6h 10m
$184
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Tue 4/21
2:10 pm-10:45 pm
2 stops8h 35m
San Francisco
Tue 4/28
2:50 pm-10:10 pm
2 stops7h 20m
$186
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Wed 6/3
3:30 pm-7:35 pm
1 stop4h 05m
Las Vegas Harry Reid Intl
Tue 6/9
5:10 pm-10:10 pm
2 stops5h 00m
$188
OntarioReno
ONT - RNO
ONTRNO
Ontario
Mon 5/4
5:05 pm-10:35 pm
1 stop5h 30m
Reno
Wed 5/6
6:25 pm-10:10 pm
1 stop3h 45m
$191
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Tue 4/21
4:22 pm-6:22 pm
Nonstop2h 00m
Santa Rosa Sonoma County
Sat 4/25
10:41 am-12:08 pm
Nonstop1h 27m
$197
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Sat 6/6
1:20 pm-7:05 pm
1 stop5h 45m
Las Vegas Harry Reid Intl
Tue 6/9
11:20 am-5:05 pm
1 stop5h 45m
$199
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-OAK
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, May is the cheapest month in which you can book a flight from Ontario to California (average of $33). 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 March 27, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 20% on flights from Ontario to California by exploring options for tickets in the evening.
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 March 23, 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 March 27, 2026.
Get a feel of what it's like to fly with Southwest,Alaska Airlines, andUnited Airlines from Ontario to California by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Comfort
8.0
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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 March 27, 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 March 27, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$34 | Average$133 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$63 | Average$253 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$78 | Average$173 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$104 | Average$299 | FlexibilityNo cancel fee | On-time63% |