$46+ Cheap flights from California to Ontario (ONT)
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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ONT
июл 10 — июл 171
Round-trip
1 adult, Economy
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Cheapest flights from California to OntarioExplore the most affordable flight options available from California to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on июнь 10, 2026.
Explore the most affordable flight options available from California to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on июнь 10, 2026.
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
вт. 6/301:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
ср. 7/153:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/6![Frontier logo]()
$66
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.
вт. 6/301:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
пт. 7/33:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/5![Frontier logo]()
$67
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.
ср. 7/16:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
сб. 7/43:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/6![Frontier logo]()
$71
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.
ср. 9/303:00 pm
LAS
- ONT
Nonstop1h 10m
Frontier
пн. 10/52:58 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 6/6![Frontier logo]()
$72
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.
вт. 6/301:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
ср. 7/13:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/8![Frontier logo]()
$76
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
пт. 7/36:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
сб. 7/43:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/6![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.
пн. 9/213:00 pm
LAS
- ONT
Nonstop1h 10m
Frontier
сб. 9/269:49 pm
ONT
- LAS
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.
чт. 9/249:10 am
LAS
- ONT
Nonstop1h 11m
Frontier
чт. 9/242:58 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 6/7![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.
вт. 9/16:40 pm
LAS
- ONT
Nonstop1h 08m
Frontier
пн. 9/149:49 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 6/7![Frontier logo]()
$84
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
сб. 9/51:56 pm
LAS
- ONT
Nonstop1h 13m
Frontier
сб. 9/262:58 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 6/5![Frontier logo]()
$85
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ср. 8/1211:15 am
SFO
- ONT
Nonstop1h 33m
Frontier
вт. 8/188:33 pm
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 6/9![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.
чт. 7/309:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
чт. 8/68:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 6/7![Frontier logo]()
$87
Best flights from California to OntarioDiscover carefully curated flight deals from California to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated июнь 10, 2026.
Discover carefully curated flight deals from California to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated июнь 10, 2026.
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.
вт. 8/42:55 pm
SJC
- ONT
2 stops6h 00m
Southwest
вт. 8/111:10 pm
ONT
- SJC
2 stops6h 00m
Southwest
Deal found 6/5![Southwest logo]()
$167
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
вс. 9/2012:59 am
LAS
- ONT
1 stop9h 44m
Frontier
вт. 9/229:49 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 6/9![Frontier logo]()
$175
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.
сб. 9/52:14 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
пн. 9/74:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 6/7![Alaska Airlines logo]()
$187
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
пт. 10/3011:25 am
STS
- ONT
1 stop4h 47m
Delta
вс. 11/86:00 am
ONT
- STS
1 stop4h 39m
Delta
Deal found 6/6![Delta logo]()
$217
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.
ср. 7/810:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
вт. 7/146:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Deal found 6/8![United Airlines logo]()
$247
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.
вт. 8/43:25 pm
OAK
- ONT
2 stops5h 30m
Southwest
ср. 8/52:40 pm
ONT
- OAK
Nonstop1h 15m
Southwest
Deal found 6/8![Southwest logo]()
$177
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
пт. 8/77:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
вс. 8/911:47 am
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 6/9![Frontier logo]()
$190
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.
ср. 7/15:55 am
LAS
- ONT
1 stop3h 20m
Southwest
вт. 7/74:05 pm
ONT
- LAS
1 stop5h 25m
Southwest
Deal found 6/5![Southwest logo]()
$177
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.
вт. 9/16:00 am
STS
- ONT
2 stops7h 35m
Southwest
ср. 9/93:00 pm
ONT
- STS
2 stops6h 25m
Southwest
Deal found 6/8![Southwest logo]()
$179
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ср. 8/126:40 am
SJC
- ONT
1 stop6h 00m
Southwest
чт. 8/132:40 pm
ONT
- SJC
2 stops6h 30m
Southwest
Deal found 6/6![Southwest logo]()
$184
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.
чт. 8/610:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
сб. 8/81:50 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
Deal found 6/5![United Airlines logo]()
$251
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
вс. 7/1912:59 am
LAS
- ONT
1 stop9h 05m
Frontier
чт. 7/2311:52 am
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 6/9![Frontier logo]()
$233
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.
вс. 8/302:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
пт. 9/44:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 6/8![Alaska Airlines logo]()
$257
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ср. 7/86:30 am
SJC
- ONT
Nonstop1h 20m
Southwest
чт. 7/96:30 am
ONT
- SJC
Nonstop1h 20m
Southwest
Deal found 6/6![Southwest logo]()
$192
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.
ср. 7/19:00 pm
SFO
- ONT
Nonstop1h 37m
United Airlines
сб. 7/41:50 pm
ONT
- SFO
Nonstop1h 25m
United Airlines
Deal found 6/5![United Airlines logo]()
$257
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.
пн. 9/142:09 pm
STS
- ONT
Nonstop1h 38m
Alaska Airlines
пт. 9/184:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Deal found 6/7![Alaska Airlines logo]()
$257
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
пт. 7/107:00 am
LAS
- ONT
1 stop4h 07m
Frontier
пн. 7/133:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/9![Frontier logo]()
$235
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.
ср. 7/16:20 pm
LAS
- ONT
1 stop4h 17m
United Airlines
сб. 7/41:50 pm
ONT
- LAS
1 stop5h 45m
United Airlines
Deal found 6/7![United Airlines logo]()
$257
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ср. 7/85:24 pm
MFR
- ONT
1 stop5h 28m
Delta
ср. 7/156:20 am
ONT
- MFR
1 stop6h 36m
Delta
Deal found 6/7![Delta logo]()
$329
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
сб. 8/296:40 am
OAK
- ONT
Nonstop1h 25m
Southwest
вт. 9/11:50 pm
ONT
- OAK
1 stop6h 00m
Southwest
Deal found 6/7![Southwest logo]()
$211
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.
пт. 6/264:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
вс. 6/286:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Deal found 6/9![Alaska Airlines logo]()
$287
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
пт. 7/171:04 pm
RNO
- ONT
1 stop18h 59m
Frontier
сб. 7/183:40 pm
ONT
- RNO
1 stop4h 22m
Frontier
Deal found 6/9![Frontier logo]()
$274
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ср. 7/2212:20 pm
MFR
- ONT
1 stop5h 01m
Delta
вт. 7/286:01 pm
ONT
- MFR
1 stop5h 10m
Delta
Deal found 6/5![Delta logo]()
$339
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
сб. 8/86:00 am
SMF
- ONT
1 stop6h 12m
United Airlines
вт. 8/111:56 pm
ONT
- SMF
1 stop5h 51m
United Airlines
Deal found 6/9![United Airlines logo]()
$281
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.
чт. 7/166:45 pm
SFO
- ONT
1 stop5h 25m
Southwest
вт. 7/214:35 pm
ONT
- SFO
2 stops6h 00m
Southwest
Deal found 6/5![Southwest logo]()
$212
This Delta 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ср. 8/266:00 am
RNO
- ONT
1 stop6h 05m
Delta
чт. 9/105:05 pm
ONT
- RNO
1 stop6h 25m
Delta
Deal found 6/5![Delta logo]()
$352
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.
сб. 10/310:33 am
MFR
- ONT
1 stop7h 27m
Alaska Airlines
вт. 10/66:54 pm
ONT
- MFR
1 stop5h 05m
Alaska Airlines
Deal found 6/6![Alaska Airlines logo]()
$329
This Southwest 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
сб. 8/295:00 am
SFO
- ONT
2 stops6h 15m
Southwest
вт. 9/14:45 pm
ONT
- SFO
1 stop4h 35m
Southwest
Deal found 6/7![Southwest logo]()
$226
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
сб. 7/1810:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
пн. 7/206:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Deal found 6/9![United Airlines logo]()
$303
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.
ср. 8/193:10 pm
MFR
- ONT
1 stop5h 14m
Alaska Airlines
сб. 8/223:07 pm
ONT
- MFR
1 stop8h 52m
Alaska Airlines
Deal found 6/8![Alaska Airlines logo]()
$329
Last-minute flights from California to OntarioDiscover last-minute flight deals from California to Ontario. Data last updated июнь 10, 2026 and is based on user searches.
Discover last-minute flight deals from California to Ontario. Data last updated июнь 10, 2026 and is based on user searches.
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ср. 6/1711:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
пн. 6/298:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 6/5![Frontier logo]()
$189
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.
пн. 6/226:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
ср. 7/151:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/5![Frontier logo]()
$115
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.
ср. 6/246:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
ср. 7/81:38 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/6![Frontier logo]()
$116
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
пн. 6/296:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
ср. 7/11:33 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/6![Frontier logo]()
$117
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.
вт. 6/301:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
пт. 7/33:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/5![Frontier logo]()
$67
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.
вт. 6/301:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
ср. 7/13:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/8![Frontier logo]()
$76
This Super.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ср. 7/11:55 pm
LAS
- ONT
Nonstop1h 13m
Frontier
ср. 7/83:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/10![Frontier logo]()
$66
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.
ср. 7/16:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
сб. 7/43:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/6![Frontier logo]()
$71
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.
ср. 7/16:30 am
SJC
- ONT
Nonstop1h 20m
Southwest
ср. 7/18:55 pm
ONT
- SJC
Nonstop1h 10m
Southwest
Deal found 6/5![Southwest logo]()
$137
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
пт. 7/36:43 pm
LAS
- ONT
Nonstop1h 08m
Frontier
сб. 7/43:34 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 6/6![Frontier logo]()
$77
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
чт. 7/307:00 am
LAS
- ONT
Nonstop1h 03m
Frontier
вс. 8/211:52 am
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 6/6![Frontier logo]()
$88
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.
пт. 7/312:45 pm
LAS
- ONT
Nonstop1h 09m
Frontier
вс. 8/23:40 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 6/7![Frontier logo]()
$87
One-way flights from California to OntarioSearch for one-way flight options from California to Ontario. Find affordable one-way fares based on user searches. Data last updated июнь 10, 2026.
Search for one-way flight options from California to Ontario. Find affordable one-way fares based on user searches. Data last updated июнь 10, 2026.
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
вт. 8/42:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/9![Frontier logo]()
$46
This Frontier deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
вт. 8/251:56 pm
LAS
- ONT
Nonstop1h 13m
Frontier
Deal found 6/10![Frontier logo]()
$47
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
сб. 8/82:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/9![Frontier logo]()
$49
This Trip.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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ср. 10/73:00 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 6/9![Frontier logo]()
$50
This Kiwi.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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
вт. 9/86:40 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 6/8![Frontier logo]()
$53
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.
сб. 8/152:05 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Deal found 6/8![Frontier logo]()
$54
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
пн. 10/266:49 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 6/5![Frontier logo]()
$61
This iWofly 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 iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
пн. 6/299:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 6/8![Frontier logo]()
$62
This Super.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
сб. 8/19:33 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 6/10![Frontier logo]()
$63
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.
чт. 6/259:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 6/7![Frontier logo]()
$64
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
чт. 11/57:19 pm
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 6/9![Frontier logo]()
$65
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
пн. 8/109:33 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 6/6![Frontier logo]()
$66
Find flight deals from California to Ontario
Keep the following information in mind while searching for California to Ontario flight deals. Data was last updated июнь 10, 2026.
Round-trip from | $66 (Super.com) |
|---|---|
One-way from | $46 (Frontier) |
Good round-trip deal | $115 or less |
Good one-way deal | $85 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from California to Ontario 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 июнь 10, 2026.
Use the filters below to find and compare flights from California to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
San JoseOntario
SJC - ONT
SJCONT
San Jose
вт. 8/4
2:55 pm-8:55 pm
2 stops6h 00m
Ontario
вт. 8/11
1:10 pm-7:10 pm
2 stops6h 00m
$167
Las VegasOntario
LAS - ONT
LASONT
Las Vegas Harry Reid Intl
вс. 9/20
12:59 am-10:43 am
1 stop9h 44m
Ontario
вт. 9/22
9:49 pm-10:58 pm
Nonstop1h 09m
$175
OaklandOntario
OAK - ONT
OAKONT
Oakland
вт. 8/4
3:25 pm-8:55 pm
2 stops5h 30m
Ontario
ср. 8/5
2:40 pm-3:55 pm
Nonstop1h 15m
$177
Las VegasOntario
LAS - ONT
LASONT
Las Vegas Harry Reid Intl
ср. 7/1
5:55 am-9:15 am
1 stop3h 20m
Ontario
вт. 7/7
4:05 pm-9:30 pm
1 stop5h 25m
$177
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
вт. 9/1
6:00 am-1:35 pm
2 stops7h 35m
Ontario
ср. 9/9
3:00 pm-9:25 pm
2 stops6h 25m
$179
San JoseOntario
SJC - ONT
SJCONT
San Jose
ср. 8/12
6:40 am-12:40 pm
1 stop6h 00m
Ontario
чт. 8/13
2:40 pm-9:10 pm
2 stops6h 30m
$184
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
сб. 9/5
2:14 pm-3:52 pm
Nonstop1h 38m
Ontario
пн. 9/7
4:27 pm-6:07 pm
Nonstop1h 40m
$187
Quickest round-trip
Las VegasOntario
LAS - ONT
LASONT
Las Vegas Harry Reid Intl
пт. 8/7
7:00 am-8:03 am
Nonstop1h 03m
Ontario
вс. 8/9
11:47 am-12:57 pm
Nonstop1h 10m
$190
San JoseOntario
SJC - ONT
SJCONT
San Jose
ср. 7/8
6:30 am-7:50 am
Nonstop1h 20m
Ontario
чт. 7/9
6:30 am-7:50 am
Nonstop1h 20m
$192
OaklandOntario
OAK - ONT
OAKONT
Oakland
сб. 8/29
6:40 am-8:05 am
Nonstop1h 25m
Ontario
вт. 9/1
1:50 pm-7:50 pm
1 stop6h 00m
$211
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from California to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from California with our price prediction graph.
LAS-ONT
SJC-ONT
SMF-ONT
STS-ONT
FAT-ONT
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 California to Ontario
USCA-ONT
LAS-ONT
SJC-ONT
SMF-ONT
STS-ONT
What is the cheapest month to book a flight from California to Ontario?
Currently, January is the cheapest month in which you can book a flight from California to Ontario (average of $19). Flying from California to Ontario in November is currently the most expensive (average of $722). 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 CA to ONT?
Find hourly flight availability from California to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated июнь 10, 2026.
It’s typically best to fly out from California to Ontario in the evening. Doing so could potentially save you 24% on the flight price compared to flying at noon, which is usually more expensive.
How far ahead should I book a flight from California to Ontario?
Booking 77 days in advance of your planned departure date is, on average, the best time to get cheap flights from California to Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
What is the cheapest day to fly from California to Ontario?
Use this chart to determine the cheapest time to fly round-trip from California to Ontario. Price data was last updated on June 8, 2026.
Travelers seeking maximum savings on their California to Ontario flight should consider departing on Monday evenings when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. 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 Ontario. Reviews last updated июнь 10, 2026.
See what other customers who have flown with Alaska Airlines,Southwest, andDelta from California to Ontario have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.0
Food
7.0
Comfort
7.8
Crew
8.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Entertainment
7.0
Food
7.0
Comfort
7.8
Crew
8.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Entertainment
7.0
Food
7.0
Comfort
7.8
Crew
8.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Entertainment
7.0
Food
7.0
Comfort
7.8
Crew
8.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Entertainment
7.0
Food
7.0
Comfort
7.8
Crew
8.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Entertainment
7.0
Food
7.0
Comfort
7.8
Crew
8.5
Overall
7.9
Boarding
8.1
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Related info for your journey
Find useful and relevant information for your journey from California to Ontario. 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.
Alternative routes
Complete your trip
Flights by cabin class
Ontario flight routes
Other flight options
Popular flights
Top destinations
Alternative routes for California to Ontario
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to Ontario by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from California to Ontario by cabin class
Find flights from California to Ontario, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Other flights to Ontario
Explore flights to Ontario departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on июнь 10, 2026.
California and Ontario flights
Browse other California and Ontario flight options. Last updated on июнь 10, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
California to Ontario flights
Consider these flights traveling from California to Ontario.
Top 4 airlines flying from California to Ontario
Discover the top 4 airlines that operate flights from California to Ontario. 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 июнь 10, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$39 | Average$169 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$66 | Average$256 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$68 | Average$313 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$122 | Average$305 | FlexibilityNo cancel fee | On-time63% |