$34+ 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 7/3. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Jul 9 — Jul 161
Round-trip
1 adult, Economy
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Cheapest flights from Ontario to CaliforniaExplore the most affordable flight options available from Ontario to California. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 9, 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 June 9, 2026.
This Super.com deal was found by Cheapflights users on 6/4. 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.
Tue 8/111:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 8/157:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/4![Frontier logo]()
$75
This Super.com deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/301:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Fri 7/31:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/9![Frontier logo]()
$76
This Frontier deal was found by Cheapflights users on 6/4. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/293:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Fri 7/312:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/4![Frontier logo]()
$77
This Super.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/11:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 7/41:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/8![Frontier logo]()
$78
This Super.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1011:16 am
ONT
- LAS
Nonstop1h 11m
Frontier
Mon 9/147:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/7![Frontier logo]()
$79
This Frontier deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/122:58 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Mon 9/147:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/7![Frontier logo]()
$80
This Trip.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/711:43 am
ONT
- LAS
Nonstop1h 08m
Frontier
Tue 9/86:40 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/7![Frontier logo]()
$81
This Frontier deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/11:27 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Thu 9/1012:18 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/7![Frontier logo]()
$84
This Super.com deal was found by Cheapflights users on 6/4. 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 8/1011:47 am
ONT
- LAS
Nonstop1h 10m
Frontier
Thu 8/137:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/4![Frontier logo]()
$85
This Super.com deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/311:58 am
ONT
- LAS
Nonstop1h 08m
Frontier
Fri 7/36:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/5![Frontier logo]()
$86
This Super.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/313:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Wed 8/52:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/7![Frontier logo]()
$87
This Super.com deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/258:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Tue 6/3011:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 6/6![Frontier logo]()
$104
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 June 9, 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 June 9, 2026.
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/73:30 pm
ONT
- LAS
1 stop5h 10m
Southwest
Wed 7/87:55 am
LAS
- ONT
1 stop5h 00m
Southwest
Deal found 6/8![Southwest logo]()
$177
This United Airlines deal was found by Cheapflights users on 6/5. 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.
Wed 7/16:00 am
ONT
- LAS
1 stop4h 28m
United Airlines
Wed 7/16:20 pm
LAS
- ONT
1 stop4h 17m
United Airlines
Deal found 6/5![United Airlines logo]()
$212
This Alaska Airlines deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/64:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Wed 9/92:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
Deal found 6/7![Alaska Airlines logo]()
$247
This Delta deal was found by Cheapflights users on 6/4. 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.
Sat 10/246:00 am
ONT
- STS
1 stop4h 39m
Delta
Sun 10/2511:25 am
STS
- ONT
1 stop4h 47m
Delta
Deal found 6/4![Delta logo]()
$268
This Southwest deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/74:35 pm
ONT
- SFO
2 stops6h 00m
Southwest
Sat 7/115:00 am
SFO
- ONT
2 stops8h 40m
Southwest
Deal found 6/5![Southwest logo]()
$217
This United Airlines deal was found by Cheapflights users on 6/5. 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 8/66:00 am
ONT
- SMF
1 stop3h 25m
United Airlines
Sat 8/86:00 am
SMF
- ONT
1 stop6h 12m
United Airlines
Deal found 6/5![United Airlines logo]()
$247
This Southwest deal was found by Cheapflights users on 6/4. 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.
Sat 7/254:55 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Sat 7/258:40 pm
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 6/4![Southwest logo]()
$237
This Southwest deal was found by Cheapflights users on 6/4. 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 6/2510:50 am
ONT
- SJC
Nonstop1h 10m
Southwest
Sat 6/278:40 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 6/4![Southwest logo]()
$237
This Alaska Airlines deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/196:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Mon 6/224:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/5![Alaska Airlines logo]()
$287
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/19:01 am
ONT
- SMF
1 stop4h 06m
United Airlines
Wed 9/26:30 am
SMF
- ONT
1 stop5h 42m
United Airlines
Deal found 6/8![United Airlines logo]()
$281
This Alaska Airlines deal was found by Cheapflights users on 6/4. 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.
Wed 7/226:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Thu 7/234:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/4![Alaska Airlines logo]()
$287
This Southwest deal was found by Cheapflights users on 6/4. 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.
Fri 7/35:15 pm
ONT
- SFO
2 stops7h 15m
Southwest
Tue 7/75:00 am
SFO
- ONT
1 stop4h 15m
Southwest
Deal found 6/4![Southwest logo]()
$243
This Delta deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/216:20 am
ONT
- MFR
1 stop6h 36m
Delta
Fri 7/245:24 pm
MFR
- ONT
1 stop5h 28m
Delta
Deal found 6/8![Delta logo]()
$331
This Alaska Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/276:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Mon 6/294:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/9![Alaska Airlines logo]()
$287
This United Airlines deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/26:00 am
ONT
- MRY
1 stop5h 18m
United Airlines
Mon 10/57:10 pm
MRY
- ONT
1 stop3h 49m
United Airlines
Deal found 6/7![United Airlines logo]()
$289
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/225:40 am
ONT
- SMF
1 stop3h 30m
Southwest
Mon 8/246:15 pm
SMF
- ONT
1 stop3h 50m
Southwest
Deal found 6/8![Southwest logo]()
$244
This Delta deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/86:20 am
ONT
- MFR
1 stop6h 36m
Delta
Sun 7/126:15 am
MFR
- ONT
1 stop5h 02m
Delta
Deal found 6/8![Delta logo]()
$333
This United Airlines deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/276:00 am
ONT
- MRY
1 stop4h 15m
United Airlines
Wed 9/23:36 pm
MRY
- ONT
1 stop4h 25m
United Airlines
Deal found 6/6![United Airlines logo]()
$289
This Southwest deal was found by Cheapflights users on 6/4. 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.
Tue 7/145:15 am
ONT
- SMF
1 stop4h 50m
Southwest
Tue 7/147:55 pm
SMF
- ONT
Nonstop1h 25m
Southwest
Deal found 6/4![Southwest logo]()
$249
This Alaska Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/286:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Tue 6/304:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/8![Alaska Airlines logo]()
$317
This United Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/151:50 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
Mon 7/2010:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 6/8![United Airlines logo]()
$302
This Southwest deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/116:30 pm
ONT
- SFO
1 stop6h 05m
Southwest
Mon 7/136:45 pm
SFO
- ONT
1 stop5h 25m
Southwest
Deal found 6/5![Southwest logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/286:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Wed 7/14:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 6/8![Alaska Airlines logo]()
$317
This United Airlines deal was found by Cheapflights users on 6/4. 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.
Thu 7/306:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Mon 8/39:00 pm
SFO
- ONT
Nonstop1h 37m
United Airlines
Deal found 6/4![United Airlines logo]()
$307
This Southwest deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/263:35 pm
ONT
- RNO
1 stop5h 55m
Southwest
Sat 8/295:30 am
RNO
- ONT
1 stop5h 45m
Southwest
Deal found 6/8![Southwest logo]()
$259
This Delta deal was found by Cheapflights users on 6/4. 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 6/225:59 pm
ONT
- MFR
1 stop5h 13m
Delta
Mon 6/295:25 pm
MFR
- ONT
1 stop5h 16m
Delta
Deal found 6/4![Delta logo]()
$436
This Alaska Airlines deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/110:45 am
ONT
- MFR
1 stop4h 56m
Alaska Airlines
Wed 9/26:00 am
MFR
- ONT
1 stop5h 04m
Alaska Airlines
Deal found 6/6![Alaska Airlines logo]()
$329
This United Airlines deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/111:50 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
Mon 7/139:00 pm
SFO
- ONT
Nonstop1h 37m
United Airlines
Deal found 6/7![United Airlines logo]()
$315
This Southwest deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/95:15 am
ONT
- SFO
2 stops6h 05m
Southwest
Thu 7/166:45 pm
SFO
- ONT
1 stop5h 25m
Southwest
Deal found 6/5![Southwest logo]()
$262
This Alaska Airlines deal was found by Cheapflights users on 6/4. 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 7/45:32 pm
ONT
- MFR
1 stop18h 21m
Alaska Airlines
Mon 7/67:50 pm
MFR
- ONT
1 stop15h 24m
Alaska Airlines
Deal found 6/4![Alaska Airlines logo]()
$331
Last-minute flights from Ontario to CaliforniaDiscover last-minute flight deals from Ontario to California. Data last updated June 9, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to California. Data last updated June 9, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/258:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Tue 6/3011:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 6/6![Frontier logo]()
$104
This Super.com deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/298:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Tue 6/3011:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 6/5![Frontier logo]()
$105
This CheapOair deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/301:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Fri 7/31:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/8![Frontier logo]()
$76
This Super.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/11:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Sat 7/41:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/8![Frontier logo]()
$78
This Super.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/33:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Sat 7/46:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/7![Frontier logo]()
$79
This Super.com deal was found by Cheapflights users on 6/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/311:58 am
ONT
- LAS
Nonstop1h 08m
Frontier
Fri 7/36:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/5![Frontier logo]()
$86
This Booking.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 7/43:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Tue 7/72:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/8![Frontier logo]()
$97
This CheapOair deal was found by Cheapflights users on 6/4. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/153:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Tue 7/217:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/4![Frontier logo]()
$80
This Super.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/208:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Thu 7/309:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/7![Frontier logo]()
$107
This Frontier deal was found by Cheapflights users on 6/4. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/293:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Fri 7/312:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/4![Frontier logo]()
$77
This Super.com deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/313:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Wed 8/52:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/7![Frontier logo]()
$87
This Kiwi.com deal was found by Cheapflights users on 6/4. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/3111:52 am
ONT
- LAS
Nonstop1h 10m
Frontier
Sun 8/27:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
Deal found 6/4![Frontier logo]()
$90
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 June 9, 2026.
Search for one-way flight options from Ontario to California. Find affordable one-way fares based on user searches. Data last updated June 9, 2026.
This Super.com deal was found by Cheapflights users on 6/4. 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.
Fri 7/33:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/4![Frontier logo]()
$34
This Super.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/53:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/8![Frontier logo]()
$38
This Frontier deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/219:49 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 6/7![Frontier logo]()
$40
This Frontier deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/172:58 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 6/7![Frontier logo]()
$41
This CheapOair deal was found by Cheapflights users on 6/4. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/134:34 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 6/4![Frontier logo]()
$43
This Frontier deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/13:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/7![Frontier logo]()
$44
This Super.com deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/121:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/8![Frontier logo]()
$45
This CheapOair deal was found by Cheapflights users on 6/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/811:16 am
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/7![Frontier logo]()
$46
This CheapOair deal was found by Cheapflights users on 6/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/221:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/6![Frontier logo]()
$47
This Frontier deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/41:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/8![Frontier logo]()
$48
This Frontier deal was found by Cheapflights users on 6/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/211:38 am
ONT
- SFO
Nonstop1h 34m
Frontier
Deal found 6/8![Frontier logo]()
$62
This Super.com deal was found by Cheapflights users on 6/4. 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 7/208:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 6/4![Frontier logo]()
$63
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 June 9, 2026.
Round-trip from | $75 (Super.com) |
|---|---|
One-way from | $34 (Super.com) |
Good round-trip deal | $184 or less |
Good one-way deal | $131 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 June 9, 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
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Tue 7/7
3:30 pm-8:40 pm
1 stop5h 10m
Las Vegas Harry Reid Intl
Wed 7/8
7:55 am-12:55 pm
1 stop5h 00m
$177
OntarioLas Vegas
ONT - LAS
ONTLAS
Ontario
Wed 7/1
6:00 am-10:28 am
1 stop4h 28m
Las Vegas Harry Reid Intl
Wed 7/1
6:20 pm-10:37 pm
1 stop4h 17m
$212
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Tue 7/7
4:35 pm-10:35 pm
2 stops6h 00m
San Francisco
Sat 7/11
5:00 am-1:40 pm
2 stops8h 40m
$217
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Sat 7/25
4:55 pm-6:10 pm
Nonstop1h 15m
San Jose
Sat 7/25
8:40 pm-10:00 pm
Nonstop1h 20m
$237
Quickest round-trip
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Thu 6/25
10:50 am-12:00 pm
Nonstop1h 10m
San Jose
Sat 6/27
8:40 pm-9:55 pm
Nonstop1h 15m
$237
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Fri 7/3
5:15 pm-12:30 am
2 stops7h 15m
San Francisco
Tue 7/7
5:00 am-9:15 am
1 stop4h 15m
$243
OntarioSacramento
ONT - SMF
ONTSMF
Ontario
Sat 8/22
5:40 am-9:10 am
1 stop3h 30m
Sacramento Intl
Mon 8/24
6:15 pm-10:05 pm
1 stop3h 50m
$244
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Sun 9/6
4:27 pm-6:07 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Wed 9/9
2:09 pm-3:47 pm
Nonstop1h 38m
$247
OntarioSacramento
ONT - SMF
ONTSMF
Ontario
Thu 8/6
6:00 am-9:25 am
1 stop3h 25m
Sacramento Intl
Sat 8/8
6:00 am-12:12 pm
1 stop6h 12m
$247
OntarioSacramento
ONT - SMF
ONTSMF
Ontario
Tue 7/14
5:15 am-10:05 am
1 stop4h 50m
Sacramento Intl
Tue 7/14
7:55 pm-9:20 pm
Nonstop1h 25m
$249
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-SJC
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, 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 $389). 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 June 9, 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 90 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 June 8, 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 June 9, 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
Food
7.1
Crew
8.5
Overall
7.9
Boarding
8.1
Entertainment
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Comfort
7.8
Food
7.1
Crew
8.5
Overall
7.9
Boarding
8.1
Entertainment
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Comfort
7.8
Food
7.1
Crew
8.5
Overall
7.9
Boarding
8.1
Entertainment
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Comfort
7.8
Food
7.1
Crew
8.5
Overall
7.9
Boarding
8.1
Entertainment
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Comfort
7.8
Food
7.1
Crew
8.5
Overall
7.9
Boarding
8.1
Entertainment
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Comfort
7.8
Food
7.1
Crew
8.5
Overall
7.9
Boarding
8.1
Entertainment
7.0
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Related info for your journey
Find useful and relevant information for your journey from Ontario to California. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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 June 9, 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 June 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$134 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$78 | Average$157 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$89 | Average$246 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$124 | Average$314 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$153 | Average$169 | FlexibilityNo cancel fee | On-time62% |