$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 9/2. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Aug 5 — Aug 121
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to California with Cheapflights
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Cheapest flights from Ontario to CaliforniaExplore the most affordable flight options available from Ontario to California. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 6, 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 July 6, 2026.
This Trip.com deal was found by Cheapflights users on 7/4. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/18:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Mon 8/109:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/4![Frontier logo]()
$97
This Booking.com deal was found by Cheapflights users on 7/3. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/18:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Tue 8/411:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Deal found 7/3![Frontier logo]()
$98
This Super.com deal was found by Cheapflights users on 7/2. 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.
Thu 9/38:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 9/79:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/2![Frontier logo]()
$99
This Frontier deal was found by Cheapflights users on 7/3. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/58:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Tue 9/812:33 pm
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 7/3![Frontier logo]()
$105
This Super.com deal was found by Cheapflights users on 7/1. 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 Super.com 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
Mon 8/319:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/1![Frontier logo]()
$106
This Frontier deal was found by Cheapflights users on 7/1. 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.
Mon 8/248:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 8/319:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/1![Frontier logo]()
$107
This Frontier deal was found by Cheapflights users on 7/1. 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.
Tue 10/62:58 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Tue 10/67:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 7/1![Frontier logo]()
$113
This Kiwi.com deal was found by Cheapflights users on 7/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/58:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 9/79:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/3![Frontier logo]()
$114
This Super.com deal was found by Cheapflights users on 7/2. 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.
Tue 8/114:09 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Wed 8/127:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 7/2![Frontier logo]()
$116
This Super.com deal was found by Cheapflights users on 7/1. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/111:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 8/157:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 7/1![Frontier logo]()
$117
This Southwest deal was found by Cheapflights users on 7/2. 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.
Tue 8/46:25 pm
ONT
- SJC
Nonstop1h 10m
Southwest
Wed 8/512:20 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 7/2![Southwest logo]()
$117
This United Airlines deal was found by Cheapflights users on 7/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/266:08 am
ONT
- SFO
Nonstop1h 27m
United Airlines
Wed 9/910:37 am
SFO
- ONT
Nonstop1h 35m
United Airlines
Deal found 7/1![United Airlines 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 July 6, 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 July 6, 2026.
This Southwest deal was found by Cheapflights users on 7/1. 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.
Wed 7/297:20 pm
ONT
- SFO
1 stop4h 10m
Southwest
Wed 8/56:50 am
SFO
- ONT
1 stop5h 50m
Southwest
Deal found 7/1![Southwest logo]()
$151
This Delta deal was found by Cheapflights users on 7/5. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/106:00 am
ONT
- STS
1 stop4h 49m
Delta
Mon 10/124:50 pm
STS
- ONT
1 stop6h 56m
Delta
Deal found 7/5![Delta logo]()
$177
This United Airlines deal was found by Cheapflights users on 7/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/296:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Wed 7/2910:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 7/1![United Airlines logo]()
$182
This Alaska Airlines deal was found by Cheapflights users on 7/2. 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.
Fri 7/246:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sun 7/264:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 7/2![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 7/3. 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.
Thu 8/202:40 pm
ONT
- SJC
2 stops6h 30m
Southwest
Mon 8/242:40 pm
SJC
- ONT
2 stops7h 25m
Southwest
Deal found 7/3![Southwest logo]()
$211
This United Airlines deal was found by Cheapflights users on 7/2. 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.
Sat 8/81:50 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
Mon 8/1010:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 7/2![United Airlines logo]()
$219
This Southwest deal was found by Cheapflights users on 7/1. 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.
Thu 10/228:20 pm
ONT
- OAK
Nonstop1h 15m
Southwest
Sat 10/245:00 pm
OAK
- ONT
Nonstop1h 20m
Southwest
Deal found 7/1![Southwest logo]()
$212
This Delta deal was found by Cheapflights users on 7/2. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/15:10 pm
ONT
- SMF
1 stop5h 00m
Delta
Mon 8/37:18 pm
SMF
- ONT
1 stop4h 16m
Delta
Deal found 7/2![Delta logo]()
$238
This Southwest deal was found by Cheapflights users on 7/2. 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.
Wed 10/146:10 am
ONT
- SFO
2 stops9h 00m
Southwest
Sat 10/175:00 am
SFO
- ONT
1 stop3h 45m
Southwest
Deal found 7/2![Southwest logo]()
$215
This Delta deal was found by Cheapflights users on 7/3. 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 12/126:00 am
ONT
- STS
1 stop4h 39m
Delta
Sat 1/24:55 pm
STS
- ONT
1 stop6h 53m
Delta
Deal found 7/3![Delta logo]()
$247
This Alaska Airlines deal was found by Cheapflights users on 7/3. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/186:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sun 7/194:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 7/3![Alaska Airlines logo]()
$287
This Southwest deal was found by Cheapflights users on 7/3. 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.
Sat 8/15:30 am
ONT
- SMF
1 stop3h 50m
Southwest
Sat 8/85:20 am
SMF
- ONT
2 stops5h 55m
Southwest
Deal found 7/3![Southwest logo]()
$216
This United Airlines deal was found by Cheapflights users on 7/3. 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.
Sat 8/16:00 am
ONT
- SMF
1 stop3h 18m
United Airlines
Tue 8/46:00 am
SMF
- ONT
1 stop6h 12m
United Airlines
Deal found 7/3![United Airlines logo]()
$267
This Southwest deal was found by Cheapflights users on 7/2. 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.
Tue 7/288:55 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Fri 7/315:00 pm
SJC
- ONT
1 stop3h 10m
Southwest
Deal found 7/2![Southwest logo]()
$223
This United Airlines deal was found by Cheapflights users on 7/5. 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 9/31:56 pm
ONT
- MRY
1 stop3h 20m
United Airlines
Mon 9/73:36 pm
MRY
- ONT
1 stop4h 25m
United Airlines
Deal found 7/5![United Airlines logo]()
$279
This Alaska Airlines deal was found by Cheapflights users on 7/3. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/274:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Tue 9/12:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 7/3![Alaska Airlines logo]()
$307
This United Airlines deal was found by Cheapflights users on 7/5. 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.
Fri 8/216:08 am
ONT
- MRY
1 stop4h 07m
United Airlines
Mon 8/246:45 pm
MRY
- ONT
1 stop4h 14m
United Airlines
Deal found 7/5![United Airlines logo]()
$279
This Alaska Airlines deal was found by Cheapflights users on 7/5. 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 11/46:31 pm
ONT
- STS
Nonstop1h 36m
Alaska Airlines
Tue 11/103:02 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Deal found 7/5![Alaska Airlines logo]()
$307
This Delta deal was found by Cheapflights users on 7/4. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/26:00 am
ONT
- STS
1 stop4h 49m
Delta
Fri 11/64:50 pm
STS
- ONT
1 stop6h 56m
Delta
Deal found 7/4![Delta logo]()
$317
This Southwest deal was found by Cheapflights users on 7/4. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/68:30 am
ONT
- STS
1 stop5h 50m
Southwest
Mon 8/102:55 pm
STS
- ONT
1 stop6h 50m
Southwest
Deal found 7/4![Southwest logo]()
$247
This Alaska Airlines deal was found by Cheapflights users on 7/3. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/85:48 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sun 10/113:40 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 7/3![Alaska Airlines logo]()
$317
This Southwest deal was found by Cheapflights users on 7/1. 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.
Mon 8/315:40 am
ONT
- LAS
Nonstop1h 05m
Southwest
Thu 9/38:50 am
LAS
- ONT
Nonstop1h 05m
Southwest
Deal found 7/1![Southwest logo]()
$247
This Delta deal was found by Cheapflights users on 7/3. 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.
Fri 8/76:01 pm
ONT
- MFR
1 stop5h 22m
Delta
Wed 8/125:28 pm
MFR
- ONT
1 stop5h 17m
Delta
Deal found 7/3![Delta logo]()
$337
This United Airlines deal was found by Cheapflights users on 7/4. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/221:56 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Wed 9/307:00 pm
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 7/4![United Airlines logo]()
$319
This Alaska Airlines deal was found by Cheapflights users on 7/4. 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.
Sat 11/712:00 pm
ONT
- STS
2 stops7h 15m
Alaska Airlines
Mon 11/93:02 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Deal found 7/4![Alaska Airlines logo]()
$320
This Southwest deal was found by Cheapflights users on 7/2. 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.
Sun 8/28:40 pm
ONT
- OAK
1 stop4h 15m
Southwest
Wed 8/512:15 pm
OAK
- ONT
Nonstop1h 20m
Southwest
Deal found 7/2![Southwest logo]()
$253
This Delta deal was found by Cheapflights users on 7/5. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/145:15 pm
ONT
- RNO
1 stop6h 20m
Delta
Thu 9/176:00 am
RNO
- ONT
1 stop6h 14m
Delta
Deal found 7/5![Delta logo]()
$359
This Alaska Airlines deal was found by Cheapflights users on 7/2. 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.
Thu 7/309:20 pm
ONT
- MFR
1 stop12h 34m
Alaska Airlines
Thu 8/67:35 pm
MFR
- ONT
1 stop4h 17m
Alaska Airlines
Deal found 7/2![Alaska Airlines logo]()
$337
This Southwest deal was found by Cheapflights users on 7/3. 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.
Fri 8/148:10 pm
ONT
- SMF
Nonstop1h 20m
Southwest
Sun 8/169:20 am
SMF
- ONT
Nonstop1h 20m
Southwest
Deal found 7/3![Southwest logo]()
$257
This United Airlines deal was found by Cheapflights users on 7/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/161:56 pm
ONT
- LAS
1 stop6h 36m
United Airlines
Tue 8/186:00 am
LAS
- ONT
2 stops6h 12m
United Airlines
Deal found 7/1![United Airlines logo]()
$343
Last-minute flights from Ontario to CaliforniaDiscover last-minute flight deals from Ontario to California. Data last updated July 6, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to California. Data last updated July 6, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 7/2. 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.
Tue 7/281:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Tue 8/112:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 7/2![Frontier logo]()
$121
This Trip.com deal was found by Cheapflights users on 7/4. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/18:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Mon 8/109:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/4![Frontier logo]()
$97
This Booking.com deal was found by Cheapflights users on 7/3. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/18:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Tue 8/411:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Deal found 7/3![Frontier logo]()
$98
This Super.com deal was found by Cheapflights users on 7/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/38:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Wed 8/511:15 am
SFO
- ONT
Nonstop1h 33m
Frontier
Deal found 7/4![Frontier logo]()
$122
This Southwest deal was found by Cheapflights users on 7/2. 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.
Tue 8/46:25 pm
ONT
- SJC
Nonstop1h 10m
Southwest
Wed 8/512:20 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 7/2![Southwest logo]()
$117
This Super.com deal was found by Cheapflights users on 7/2. 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.
Wed 8/51:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Tue 8/182:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 7/2![Frontier logo]()
$122
This Super.com deal was found by Cheapflights users on 7/4. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/58:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 8/179:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/4![Frontier logo]()
$124
This Super.com deal was found by Cheapflights users on 7/2. 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.
Tue 8/114:09 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Wed 8/122:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 7/2![Frontier logo]()
$116
This Super.com deal was found by Cheapflights users on 7/1. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/111:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 8/157:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 7/1![Frontier logo]()
$117
This Frontier deal was found by Cheapflights users on 7/1. 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.
Mon 8/248:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Mon 8/319:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/1![Frontier logo]()
$107
This United Airlines deal was found by Cheapflights users on 7/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/266:08 am
ONT
- SFO
Nonstop1h 27m
United Airlines
Wed 9/910:37 am
SFO
- ONT
Nonstop1h 35m
United Airlines
Deal found 7/1![United Airlines logo]()
$117
This Super.com deal was found by Cheapflights users on 7/1. 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 Super.com 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
Mon 8/319:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 7/1![Frontier logo]()
$106
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 July 6, 2026.
Search for one-way flight options from Ontario to California. Find affordable one-way fares based on user searches. Data last updated July 6, 2026.
This Frontier deal was found by Cheapflights users on 7/2. 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 Frontier 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 7/2![Frontier logo]()
$28
This Mytrip deal was found by Cheapflights users on 7/3. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/128:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/3![Frontier logo]()
$29
This Trip.com deal was found by Cheapflights users on 7/2. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/258:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 7/2![Frontier logo]()
$30
This Mytrip deal was found by Cheapflights users on 7/2. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/228:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 7/2![Frontier logo]()
$34
This Kiwi.com deal was found by Cheapflights users on 7/3. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/298:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/3![Frontier logo]()
$35
This Super.com deal was found by Cheapflights users on 7/2. 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.
Sat 8/88:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/2![Frontier logo]()
$43
This Super.com deal was found by Cheapflights users on 7/3. 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.
Sat 8/228:48 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/3![Frontier logo]()
$44
This Super.com deal was found by Cheapflights users on 7/1. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/108:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/1![Frontier logo]()
$46
This Frontier deal was found by Cheapflights users on 7/2. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/68:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/2![Frontier logo]()
$47
This Kiwi.com deal was found by Cheapflights users on 7/5. 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.
Tue 9/13:13 pm
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 7/5![Frontier logo]()
$51
This Super.com deal was found by Cheapflights users on 7/1. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/62:58 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 7/1![Frontier logo]()
$58
This Super.com deal was found by Cheapflights users on 7/1. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/53:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 7/1![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 July 6, 2026.
Round-trip from | $97 (Trip.com) |
|---|---|
One-way from | $28 (Frontier) |
Good round-trip deal | $176 or less |
Good one-way deal | $123 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 July 6, 2026.
Use the filters below to find and compare flights from Ontario to California that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 7/29
7:20 pm-11:30 pm
1 stop4h 10m
San Francisco
Wed 8/5
6:50 am-12:40 pm
1 stop5h 50m
$151
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Sat 10/10
6:00 am-10:49 am
1 stop4h 49m
Santa Rosa Sonoma County
Mon 10/12
4:50 pm-11:46 pm
1 stop6h 56m
$177
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 7/29
6:00 am-7:25 am
Nonstop1h 25m
San Francisco
Wed 7/29
10:40 am-12:12 pm
Nonstop1h 32m
$182
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Thu 8/20
2:40 pm-9:10 pm
2 stops6h 30m
San Jose
Mon 8/24
2:40 pm-10:05 pm
2 stops7h 25m
$211
OntarioOakland
ONT - OAK
ONTOAK
Ontario
Thu 10/22
8:20 pm-9:35 pm
Nonstop1h 15m
Oakland
Sat 10/24
5:00 pm-6:20 pm
Nonstop1h 20m
$212
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 10/14
6:10 am-3:10 pm
2 stops9h 00m
San Francisco
Sat 10/17
5:00 am-8:45 am
1 stop3h 45m
$215
OntarioSacramento
ONT - SMF
ONTSMF
Ontario
Sat 8/1
5:30 am-9:20 am
1 stop3h 50m
Sacramento Intl
Sat 8/8
5:20 am-11:15 am
2 stops5h 55m
$216
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Sat 8/8
1:50 pm-3:15 pm
Nonstop1h 25m
San Francisco
Mon 8/10
10:40 am-12:12 pm
Nonstop1h 32m
$219
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Tue 7/28
8:55 pm-10:10 pm
Nonstop1h 15m
San Jose
Fri 7/31
5:00 pm-8:10 pm
1 stop3h 10m
$223
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Fri 7/24
6:43 pm-8:14 pm
Nonstop1h 31m
Santa Rosa Sonoma County
Sun 7/26
4:35 pm-6:03 pm
Nonstop1h 28m
$227
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Ontario to California
Have a flexible travel schedule? Discover the best time to fly to California from Ontario with our price prediction graph.
ONT-SFO
ONT-STS
ONT-SJC
ONT-OAK
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-SFO
ONT-STS
ONT-SJC
ONT-OAK
What is the cheapest month to book a flight from Ontario to California?
Currently, April is the cheapest month in which you can book a flight from Ontario to California (average of $28). Flying from Ontario to California in October is currently the most expensive (average of $373). 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 July 6, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 21% 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 22 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 July 4, 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 July 6, 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.
Comfort
7.8
Entertainment
7.0
Overall
7.9
Crew
8.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Comfort
7.8
Entertainment
7.0
Overall
7.9
Crew
8.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Comfort
7.8
Entertainment
7.0
Overall
7.9
Crew
8.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Comfort
7.8
Entertainment
7.0
Overall
7.9
Crew
8.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Comfort
7.8
Entertainment
7.0
Overall
7.9
Crew
8.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Comfort
7.8
Entertainment
7.0
Overall
7.9
Crew
8.5
Boarding
8.1
Food
7.0
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Related info for your journey
Find useful and relevant information for your journey from Ontario to California. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Alternative routes for Ontario to California
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to California by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to California by cabin class
Find flights from Ontario to California, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and California flights
Browse other Ontario and California flight options. Last updated on July 6, 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 July 6, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$133 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$78 | Average$167 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$91 | Average$248 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$125 | Average$323 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$153 | Average$188 | FlexibilityNo cancel fee | On-time62% |