$28+ 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 8/19. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Sep 3 — Sep 101
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to California with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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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 August 4, 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 August 4, 2026.
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 9/1412:07 pm
ONT
- SFO
Nonstop1h 36m
Frontier
Thu 9/176:02 pm
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 7/30![Frontier logo]()
$66
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 8/278:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Sun 9/69:00 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/30![Frontier logo]()
$67
This Super.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 8/228:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 8/249:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/30![Frontier logo]()
$68
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 8/278:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Tue 9/812:57 pm
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 7/30![Frontier logo]()
$69
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 8/208:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Sat 8/299:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/30![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/248:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Wed 8/2612:33 pm
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 8/2![Frontier logo]()
$71
This Trip.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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.
Fri 9/1112:07 pm
ONT
- SFO
Nonstop1h 36m
Frontier
Thu 9/176:02 pm
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 7/30![Frontier logo]()
$72
This Super.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” 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 8/193:13 pm
ONT
- SFO
Nonstop1h 27m
Frontier
Sat 8/299:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/29![Frontier logo]()
$74
This Booking.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” 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.
Thu 9/1012:07 pm
ONT
- SFO
Nonstop1h 36m
Frontier
Thu 9/106:02 pm
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 8/2![Frontier logo]()
$76
This Booking.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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.
Thu 9/1012:07 pm
ONT
- SFO
Nonstop1h 36m
Frontier
Mon 9/146:02 pm
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 8/1![Frontier logo]()
$77
This Frontier deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1112:07 pm
ONT
- SFO
Nonstop1h 36m
Frontier
Mon 9/146:02 pm
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 7/31![Frontier logo]()
$79
This Southwest deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” 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 8/276:00 am
ONT
- SJC
Nonstop1h 15m
Southwest
Sat 8/295:00 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 7/29![Southwest logo]()
$117
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 August 4, 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 August 4, 2026.
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2211:00 am
ONT
- SJC
Nonstop1h 10m
Southwest
Mon 8/247:55 am
SJC
- ONT
1 stop3h 30m
Southwest
Deal found 7/30![Southwest logo]()
$127
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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.
Mon 9/211:56 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Wed 9/234:45 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 8/3![United Airlines logo]()
$151
This Alaska Airlines deal was found by Cheapflights users on 8/4. Clicking the “Pick Dates” 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 9/254:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Sun 9/272:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 8/4![Alaska Airlines logo]()
$167
This Delta deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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 10/246:00 am
ONT
- STS
1 stop4h 41m
Delta
Sun 10/254:50 pm
STS
- ONT
1 stop7h 05m
Delta
Deal found 8/1![Delta logo]()
$177
This Southwest deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/2911:00 am
ONT
- SJC
Nonstop1h 10m
Southwest
Sat 9/55:00 pm
SJC
- ONT
Nonstop1h 25m
Southwest
Deal found 8/1![Southwest logo]()
$134
This Southwest deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 10/307:05 pm
ONT
- SJC
Nonstop1h 10m
Southwest
Mon 11/211:05 am
SJC
- ONT
1 stop4h 20m
Southwest
Deal found 7/31![Southwest logo]()
$144
This Southwest deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 9/29:05 am
ONT
- SJC
Nonstop1h 10m
Southwest
Wed 9/912:25 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 8/3![Southwest logo]()
$151
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 11/186:00 am
ONT
- SFO
Nonstop1h 30m
United Airlines
Wed 11/186:50 pm
SFO
- ONT
Nonstop1h 25m
United Airlines
Deal found 7/30![United Airlines logo]()
$187
This Alaska Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 9/104:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Sun 9/132:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 7/30![Alaska Airlines logo]()
$207
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 8/288:30 am
ONT
- STS
1 stop5h 50m
Southwest
Mon 8/312:55 pm
STS
- ONT
2 stops7h 10m
Southwest
Deal found 7/30![Southwest logo]()
$162
This Southwest deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 9/87:45 am
ONT
- STS
1 stop3h 35m
Southwest
Wed 9/96:00 am
STS
- ONT
2 stops7h 35m
Southwest
Deal found 7/31![Southwest logo]()
$162
This Alaska Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 9/294:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Wed 9/302:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 7/31![Alaska Airlines logo]()
$217
This United Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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.
Mon 9/141:56 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Tue 9/1512:30 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 7/31![United Airlines logo]()
$221
This Alaska Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” 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 8/304:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Tue 9/12:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 8/2![Alaska Airlines logo]()
$217
This Delta deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/296:20 am
ONT
- MFR
1 stop6h 33m
Delta
Sat 8/295:28 pm
MFR
- ONT
1 stop5h 17m
Delta
Deal found 8/3![Delta logo]()
$267
This United Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/71:52 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Thu 10/89:25 pm
SFO
- ONT
Nonstop1h 26m
United Airlines
Deal found 8/2![United Airlines logo]()
$221
This Southwest deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 9/212:40 pm
ONT
- SFO
2 stops7h 05m
Southwest
Wed 9/235:40 am
SFO
- ONT
1 stop4h 45m
Southwest
Deal found 8/3![Southwest logo]()
$176
This Alaska Airlines deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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 9/154:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Thu 9/172:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 8/1![Alaska Airlines logo]()
$217
This United Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/109:01 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Mon 9/144:40 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 7/31![United Airlines logo]()
$223
This Southwest deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” 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 9/195:50 am
ONT
- SJC
1 stop6h 05m
Southwest
Mon 9/212:40 pm
SJC
- ONT
2 stops6h 05m
Southwest
Deal found 8/2![Southwest logo]()
$176
This United Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/279:01 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Mon 8/314:40 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 7/31![United Airlines logo]()
$223
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 9/185:15 am
ONT
- SJC
1 stop4h 45m
Southwest
Mon 9/218:10 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 7/30![Southwest logo]()
$186
This Delta deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 9/176:00 pm
ONT
- MFR
1 stop5h 17m
Delta
Tue 9/225:29 pm
MFR
- ONT
1 stop5h 11m
Delta
Deal found 7/30![Delta logo]()
$367
This United Airlines deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/11:56 pm
ONT
- SMF
1 stop5h 51m
United Airlines
Wed 9/22:27 pm
SMF
- ONT
1 stop5h 34m
United Airlines
Deal found 8/3![United Airlines logo]()
$259
This Southwest deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/295:40 am
ONT
- SMF
1 stop3h 30m
Southwest
Sat 9/55:30 am
SMF
- ONT
2 stops5h 45m
Southwest
Deal found 8/2![Southwest logo]()
$202
This Delta deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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 10/66:20 am
ONT
- MFR
1 stop6h 20m
Delta
Tue 10/135:15 am
MFR
- ONT
1 stop7h 06m
Delta
Deal found 8/1![Delta logo]()
$367
This Delta deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 9/166:00 am
ONT
- MFR
1 stop6h 46m
Delta
Wed 9/165:29 pm
MFR
- ONT
1 stop5h 11m
Delta
Deal found 8/3![Delta logo]()
$367
This United Airlines deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:08 am
ONT
- FAT
1 stop3h 20m
United Airlines
Thu 9/32:10 pm
FAT
- ONT
1 stop4h 01m
United Airlines
Deal found 7/30![United Airlines logo]()
$279
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 9/173:40 pm
ONT
- STS
2 stops7h 00m
Southwest
Mon 9/212:55 pm
STS
- ONT
2 stops7h 10m
Southwest
Deal found 7/30![Southwest logo]()
$217
This Alaska Airlines deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” 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 8/1912:00 pm
ONT
- MFR
1 stop6h 14m
Alaska Airlines
Sat 8/226:00 am
MFR
- ONT
1 stop5h 04m
Alaska Airlines
Deal found 8/2![Alaska Airlines logo]()
$357
Last-minute flights from Ontario to CaliforniaDiscover last-minute flight deals from Ontario to California. Data last updated August 4, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to California. Data last updated August 4, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” 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 8/193:13 pm
ONT
- SFO
Nonstop1h 27m
Frontier
Sat 8/299:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/29![Frontier logo]()
$74
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 8/208:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Sat 8/299:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/30![Frontier logo]()
$70
This Super.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 8/228:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 8/249:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/30![Frontier logo]()
$68
This Kiwi.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/248:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Wed 8/2612:33 pm
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 8/2![Frontier logo]()
$71
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 8/278:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Sun 9/69:00 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/30![Frontier logo]()
$67
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 8/278:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Tue 9/812:57 pm
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 7/30![Frontier logo]()
$69
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 8/273:40 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Thu 9/310:55 am
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 7/30![Southwest logo]()
$117
This Booking.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” 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.
Thu 9/1012:07 pm
ONT
- SFO
Nonstop1h 36m
Frontier
Thu 9/106:02 pm
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 8/2![Frontier logo]()
$76
This Booking.com deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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.
Thu 9/1012:07 pm
ONT
- SFO
Nonstop1h 36m
Frontier
Mon 9/146:02 pm
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 8/1![Frontier logo]()
$77
This Trip.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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.
Fri 9/1112:07 pm
ONT
- SFO
Nonstop1h 36m
Frontier
Thu 9/176:02 pm
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 7/30![Frontier logo]()
$72
This Frontier deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1112:07 pm
ONT
- SFO
Nonstop1h 36m
Frontier
Mon 9/146:02 pm
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 7/31![Frontier logo]()
$79
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 9/1412:07 pm
ONT
- SFO
Nonstop1h 36m
Frontier
Thu 9/176:02 pm
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 7/30![Frontier logo]()
$66
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 August 4, 2026.
Search for one-way flight options from Ontario to California. Find affordable one-way fares based on user searches. Data last updated August 4, 2026.
This Super.com deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” 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 8/193:13 pm
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/29![Frontier logo]()
$28
This Super.com deal was found by Cheapflights users on 8/2. Clicking the “Pick Dates” 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 8/248:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 8/2![Frontier logo]()
$29
This Frontier deal was found by Cheapflights users on 8/1. Clicking the “Pick Dates” 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 8/263:13 pm
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 8/1![Frontier logo]()
$30
This Trip.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 11/211:38 am
ONT
- SFO
Nonstop1h 34m
Frontier
Deal found 8/3![Frontier logo]()
$32
This Expedia deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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.
Sun 9/68:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/31![Frontier logo]()
$33
This Priceline deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 8/318:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/31![Frontier logo]()
$35
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 12/37:11 am
ONT
- SFO
Nonstop1h 33m
Frontier
Deal found 7/30![Frontier logo]()
$43
This Super.com deal was found by Cheapflights users on 8/3. Clicking the “Pick Dates” 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 10/2611:38 am
ONT
- SFO
Nonstop1h 34m
Frontier
Deal found 8/3![Frontier logo]()
$45
This Super.com deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 9/23:13 pm
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/30![Frontier logo]()
$46
This Super.com deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” 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 8/313:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 7/31![Frontier logo]()
$58
This Frontier deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 9/1510:04 am
ONT
- LAS
Nonstop1h 14m
Frontier
Deal found 7/30![Frontier logo]()
$59
This Southwest deal was found by Cheapflights users on 7/30. Clicking the “Pick Dates” 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 9/16:25 pm
ONT
- SJC
Nonstop1h 10m
Southwest
Deal found 7/30![Southwest logo]()
$59
Find flight deals from Ontario to California
Keep the following information in mind while searching for Ontario to California flight deals. Data was last updated August 4, 2026.
Round-trip from | $66 (Frontier) |
|---|---|
One-way from | $28 (Super.com) |
Good round-trip deal | $154 or less |
Good one-way deal | $90 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 August 4, 2026.
Use the filters below to find and compare flights from Ontario to California that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Sat 8/22
11:00 am-12:10 pm
Nonstop1h 10m
San Jose
Mon 8/24
7:55 am-11:25 am
1 stop3h 30m
$127
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Sat 8/29
11:00 am-12:10 pm
Nonstop1h 10m
San Jose
Sat 9/5
5:00 pm-6:25 pm
Nonstop1h 25m
$134
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Fri 10/30
7:05 pm-8:15 pm
Nonstop1h 10m
San Jose
Mon 11/2
11:05 am-3:25 pm
1 stop4h 20m
$144
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Mon 9/21
1:56 pm-3:25 pm
Nonstop1h 29m
San Francisco
Wed 9/23
4:45 pm-6:16 pm
Nonstop1h 31m
$151
Quickest round-trip
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Wed 9/2
9:05 am-10:15 am
Nonstop1h 10m
San Jose
Wed 9/9
12:25 pm-1:40 pm
Nonstop1h 15m
$151
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Fri 8/28
8:30 am-2:20 pm
1 stop5h 50m
Santa Rosa Sonoma County
Mon 8/31
2:55 pm-10:05 pm
2 stops7h 10m
$162
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Tue 9/8
7:45 am-11:20 am
1 stop3h 35m
Santa Rosa Sonoma County
Wed 9/9
6:00 am-1:35 pm
2 stops7h 35m
$162
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Fri 9/25
4:27 pm-6:07 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Sun 9/27
2:09 pm-3:47 pm
Nonstop1h 38m
$167
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Mon 9/21
2:40 pm-9:45 pm
2 stops7h 05m
San Francisco
Wed 9/23
5:40 am-10:25 am
1 stop4h 45m
$176
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Sat 9/19
5:50 am-11:55 am
1 stop6h 05m
San Jose
Mon 9/21
2:40 pm-8:45 pm
2 stops6h 05m
$176
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-SJC
ONT-SFO
ONT-STS
ONT-MFR
ONT-SMF
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-SJC
ONT-SFO
ONT-STS
ONT-MFR
What is the cheapest month to book a flight from Ontario to California?
Currently, October is the cheapest month in which you can book a flight from Ontario to California (average of $169). Flying from Ontario to California in January is currently the most expensive (average of $322). 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 August 4, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 19% on flights from Ontario to California by exploring options for tickets in the evening.
How far ahead should I book a flight from Ontario to California?
The price you pay for your flight from Ontario to California may vary depending on when you book. For the best chance of a lower fare, look to book 21 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest day to fly from Ontario to California?
Use this chart to determine the cheapest time to fly round-trip from Ontario to California. Price data was last updated on August 1, 2026.
Travelers seeking maximum savings on their Ontario to California flight should consider departing on Saturday at noon 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 August 4, 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.
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Boarding
8.1
Food
7.0
Comfort
8.0
Crew
8.6
Overall
8.0
Entertainment
7.5
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - 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 August 4, 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 5 airlines flying from Ontario to California
Discover the top 5 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 August 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$136 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$91 | Average$173 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$94 | Average$358 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$120 | Average$188 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$140 | Average$325 | FlexibilityNo cancel fee | On-time63% |