$29+ 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 2/18. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ONT
Mar 11 — Mar 181
1 adult, Economy
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Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Cheapest flights from 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 February 9, 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 February 9, 2026.
This Super.com deal was found by Cheapflights users on 2/9. 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.
Sat 2/216:06 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Sat 2/282:06 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Deal found 2/9![Frontier logo]()
$57
This Frontier deal was found by Cheapflights users on 2/5. 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.
Wed 2/1812:00 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Sat 2/212:06 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Deal found 2/5![Frontier logo]()
$58
This Gotogate deal was found by Cheapflights users on 2/7. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2612:00 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Sun 3/13:24 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 2/7![Frontier logo]()
$59
This Frontier deal was found by Cheapflights users on 2/8. 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.
Wed 4/2212:30 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Tue 5/52:44 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 2/8![Frontier logo]()
$60
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/255:12 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Fri 2/279:43 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 2/6![Frontier logo]()
$61
This Super.com deal was found by Cheapflights users on 2/6. 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 2/265:17 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Fri 2/279:43 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 2/6![Frontier logo]()
$72
This Super.com deal was found by Cheapflights users on 2/7. 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.
Sat 3/145:26 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Sun 3/221:55 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 2/7![Frontier logo]()
$73
This Frontier deal was found by Cheapflights users on 2/7. 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.
Fri 3/202:28 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Sun 3/221:55 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 2/7![Frontier logo]()
$74
This Frontier deal was found by Cheapflights users on 2/8. 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 4/215:26 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Thu 5/78:59 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 2/8![Frontier logo]()
$75
This Super.com deal was found by Cheapflights users on 2/5. 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.
Thu 3/1912:00 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Sun 3/221:55 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 2/5![Frontier logo]()
$78
This Frontier deal was found by Cheapflights users on 2/6. 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.
Sat 3/2112:17 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Sun 3/221:55 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 2/6![Frontier logo]()
$79
This Frontier deal was found by Cheapflights users on 2/6. 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.
Sat 4/1110:30 am
LAS
- ONT
Nonstop1h 09m
Frontier
Mon 4/208:59 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 2/6![Frontier logo]()
$80
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 February 9, 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 February 9, 2026.
This Super.com deal was found by Cheapflights users on 2/9. 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.
Thu 2/195:17 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Thu 2/263:24 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 2/9![Frontier logo]()
$58
This Super.com deal was found by Cheapflights users on 2/6. 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.
Sat 2/2812:00 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Mon 3/26:43 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 2/6![Frontier logo]()
$58
This Alaska Airlines deal was found by Cheapflights users on 2/6. 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.
Sat 3/282:12 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Sat 4/44:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Deal found 2/6![Alaska Airlines logo]()
$117
This Super.com deal was found by Cheapflights users on 2/8. 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 3/75:05 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Wed 3/112:23 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Deal found 2/8![Frontier logo]()
$58
This Kiwi.com deal was found by Cheapflights users on 2/9. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 3/511:35 am
RNO
- ONT
1 stop6h 52m
Multiple Airlines
Sat 3/72:46 pm
ONT
- RNO
1 stop5h 00m
Multiple Airlines
Deal found 2/9![Multiple Airlines logo]()
$136
This Super.com deal was found by Cheapflights users on 2/6. 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.
Wed 2/1812:00 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Thu 2/197:22 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 2/6![Frontier logo]()
$58
This United Airlines deal was found by Cheapflights users on 2/9. 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.
Wed 3/2510:50 am
SFO
- ONT
Nonstop1h 28m
United Airlines
Wed 3/256:37 pm
ONT
- SFO
Nonstop1h 33m
United Airlines
Deal found 2/9![United Airlines logo]()
$146
This Southwest deal was found by Cheapflights users on 2/7. 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.
Thu 3/54:05 pm
SJC
- ONT
2 stops7h 30m
Southwest
Tue 3/106:45 am
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 2/7![Southwest logo]()
$149
This Super.com deal was found by Cheapflights users on 2/9. 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.
Sat 2/2112:00 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Sun 2/223:24 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 2/9![Frontier logo]()
$58
This Super.com deal was found by Cheapflights users on 2/8. 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.
Fri 3/137:00 am
LAS
- ONT
Nonstop1h 06m
Frontier
Sun 3/151:55 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 2/8![Frontier logo]()
$58
This Frontier deal was found by Cheapflights users on 2/7. 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 3/285:26 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Sat 4/412:38 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 2/7![Frontier logo]()
$59
This Delta deal was found by Cheapflights users on 2/5. 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 4/135:14 pm
SMF
- ONT
1 stop6h 30m
Delta
Tue 4/145:05 pm
ONT
- SMF
1 stop6h 25m
Delta
Deal found 2/5![Delta logo]()
$191
This Alaska Airlines deal was found by Cheapflights users on 2/8. 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.
Tue 4/2810:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Wed 5/612:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Deal found 2/8![Alaska Airlines logo]()
$117
This Alaska Airlines deal was found by Cheapflights users on 2/7. 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.
Tue 3/312:12 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Wed 4/84:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Deal found 2/7![Alaska Airlines logo]()
$117
This Alaska Airlines deal was found by Cheapflights users on 2/8. 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.
Thu 4/3010:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Tue 5/512:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Deal found 2/8![Alaska Airlines logo]()
$117
This Super.com deal was found by Cheapflights users on 2/8. 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.
Mon 2/164:39 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Wed 2/182:06 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Deal found 2/8![Frontier logo]()
$83
This Alaska Airlines deal was found by Cheapflights users on 2/6. 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.
Fri 4/102:12 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Tue 4/144:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Deal found 2/6![Alaska Airlines logo]()
$127
This United Airlines deal was found by Cheapflights users on 2/8. 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.
Sat 3/79:30 pm
SFO
- ONT
Nonstop1h 27m
United Airlines
Thu 3/126:37 pm
ONT
- SFO
Nonstop1h 33m
United Airlines
Deal found 2/8![United Airlines logo]()
$171
This Kiwi.com deal was found by Cheapflights users on 2/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/2811:35 am
RNO
- ONT
1 stop25h 36m
Multiple Airlines
Sun 3/110:14 pm
ONT
- RNO
1 stop12h 26m
Multiple Airlines
Deal found 2/7![Multiple Airlines logo]()
$171
This Southwest deal was found by Cheapflights users on 2/6. 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.
Tue 4/218:50 pm
OAK
- ONT
Nonstop1h 25m
Southwest
Wed 4/223:30 pm
ONT
- OAK
Nonstop1h 20m
Southwest
Deal found 2/6![Southwest logo]()
$177
This Super.com deal was found by Cheapflights users on 2/8. 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 3/1812:17 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Fri 3/203:30 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 2/8![Frontier logo]()
$99
This United Airlines deal was found by Cheapflights users on 2/9. 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.
Wed 3/259:30 pm
SFO
- ONT
Nonstop1h 27m
United Airlines
Sun 3/296:00 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Deal found 2/9![United Airlines logo]()
$178
This Delta deal was found by Cheapflights users on 2/5. 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 3/145:00 am
MFR
- ONT
1 stop7h 23m
Delta
Wed 4/15:53 pm
ONT
- MFR
1 stop4h 57m
Delta
Deal found 2/5![Delta logo]()
$197
This Alaska Airlines deal was found by Cheapflights users on 2/5. 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.
Sat 3/282:12 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Tue 3/314:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Deal found 2/5![Alaska Airlines logo]()
$137
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/299:34 pm
MRY
- ONT
1 stop10h 32m
Multiple Airlines
Wed 4/110:03 pm
ONT
- MRY
1 stop23h 17m
Multiple Airlines
Deal found 2/6![Multiple Airlines logo]()
$187
This Alaska Airlines deal was found by Cheapflights users on 2/6. 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.
Sat 4/112:12 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Fri 4/174:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Deal found 2/6![Alaska Airlines logo]()
$137
This Frontier deal was found by Cheapflights users on 2/9. 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.
Thu 2/265:17 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Mon 3/22:06 pm
ONT
- LAS
1 stop9h 23m
Frontier
Deal found 2/9![Frontier logo]()
$103
This Southwest deal was found by Cheapflights users on 2/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 3/116:20 am
SMF
- ONT
2 stops9h 20m
Southwest
Wed 3/186:55 am
ONT
- SMF
Nonstop1h 30m
Southwest
Deal found 2/9![Southwest logo]()
$204
This Kiwi.com deal was found by Cheapflights users on 2/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/233:39 pm
RNO
- ONT
2 stops32h 20m
Multiple Airlines
Mon 3/309:49 pm
ONT
- RNO
1 stop12h 50m
Multiple Airlines
Deal found 2/7![Multiple Airlines logo]()
$189
This Delta deal was found by Cheapflights users on 2/6. 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.
Thu 5/146:59 pm
SMF
- ONT
1 stop4h 35m
Delta
Sat 5/166:00 am
ONT
- SMF
1 stop6h 13m
Delta
Deal found 2/6![Delta logo]()
$213
Last-minute flights from California to OntarioDiscover last-minute flight deals from California to Ontario. Data last updated February 9, 2026 and is based on user searches.
Discover last-minute flight deals from California to Ontario. Data last updated February 9, 2026 and is based on user searches.
This Super.com deal was found by Cheapflights users on 2/6. 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.
Fri 2/136:15 am
LAS
- ONT
Nonstop1h 07m
Frontier
Sat 3/147:31 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 2/6![Frontier logo]()
$82
This Super.com deal was found by Cheapflights users on 2/8. 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.
Mon 2/164:39 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Wed 2/182:06 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Deal found 2/8![Frontier logo]()
$83
This Frontier deal was found by Cheapflights users on 2/8. 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.
Wed 2/1812:00 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Sat 2/212:06 pm
ONT
- LAS
Nonstop1h 14m
Frontier
Deal found 2/8![Frontier logo]()
$58
This Frontier deal was found by Cheapflights users on 2/8. 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.
Wed 2/1812:00 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Tue 3/38:40 am
ONT
- LAS
1 stop5h 26m
Frontier
Deal found 2/8![Frontier logo]()
$93
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/255:12 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Fri 2/279:43 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 2/6![Frontier logo]()
$61
This Flightnetwork deal was found by Cheapflights users on 2/9. 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 Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 2/2612:00 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Mon 3/26:43 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 2/9![Frontier logo]()
$59
This Super.com deal was found by Cheapflights users on 2/6. 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 2/265:17 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Fri 2/279:43 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 2/6![Frontier logo]()
$72
This Super.com deal was found by Cheapflights users on 2/7. 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 3/24:39 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Fri 3/69:44 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 2/7![Frontier logo]()
$88
This Super.com deal was found by Cheapflights users on 2/7. 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.
Sat 3/145:26 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Sun 3/221:55 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 2/7![Frontier logo]()
$73
This Super.com deal was found by Cheapflights users on 2/5. 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.
Thu 3/1912:00 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Sun 3/221:55 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 2/5![Frontier logo]()
$78
This Frontier deal was found by Cheapflights users on 2/7. 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.
Fri 3/202:28 pm
LAS
- ONT
Nonstop1h 09m
Frontier
Sun 3/221:55 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 2/7![Frontier logo]()
$74
This Frontier deal was found by Cheapflights users on 2/6. 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.
Sat 3/2112:17 pm
LAS
- ONT
Nonstop1h 11m
Frontier
Sun 3/221:55 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 2/6![Frontier logo]()
$79
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 February 9, 2026.
Search for one-way flight options from California to Ontario. Find affordable one-way fares based on user searches. Data last updated February 9, 2026.
This Super.com deal was found by Cheapflights users on 2/7. 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.
Wed 2/185:12 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 2/7![Frontier logo]()
$29
This Super.com deal was found by Cheapflights users on 2/8. 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.
Thu 4/97:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 2/8![Frontier logo]()
$30
This Frontier deal was found by Cheapflights users on 2/8. 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.
Wed 5/205:26 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 2/8![Frontier logo]()
$31
This Trip.com deal was found by Cheapflights users on 2/8. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/176:59 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 2/8![Frontier logo]()
$32
This Kiwi.com deal was found by Cheapflights users on 2/7. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/46:14 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 2/7![Frontier logo]()
$34
This Super.com deal was found by Cheapflights users on 2/6. 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.
Mon 4/277:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 2/6![Frontier logo]()
$35
This Frontier deal was found by Cheapflights users on 2/7. 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 4/207:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 2/7![Frontier logo]()
$36
This Trip.com deal was found by Cheapflights users on 2/6. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1212:30 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 2/6![Frontier logo]()
$37
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/76:59 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 2/6![Frontier logo]()
$38
This Kiwi.com deal was found by Cheapflights users on 2/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/18:21 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 2/6![Frontier logo]()
$43
This CheapOair deal was found by Cheapflights users on 2/8. 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.
Wed 4/295:26 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 2/8![Frontier logo]()
$45
This Southwest deal was found by Cheapflights users on 2/9. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/107:50 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 2/9![Southwest logo]()
$49
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 February 9, 2026.
Round-trip from | $58 (Super.com) |
|---|---|
One-way from | $29 (Super.com) |
Good round-trip deal | $157 or less |
Good one-way deal | $139 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 February 9, 2026.
Use the filters below to find and compare flights from California to Ontario that are best for you.
Fly from
California
Fly to
Ontario
Route
Depart
Return
Price
Las VegasOntario
LAS - ONT
LASONT
Las Vegas Harry Reid Intl
Thu 2/19
5:17 pm-6:27 pm
Nonstop1h 10m
Ontario
Thu 2/26
3:24 pm-4:36 pm
Nonstop1h 12m
$58
Las VegasOntario
LAS - ONT
LASONT
Las Vegas Harry Reid Intl
Sat 2/28
12:00 pm-1:11 pm
Nonstop1h 11m
Ontario
Mon 3/2
6:43 pm-7:52 pm
Nonstop1h 09m
$58
Las VegasOntario
LAS - ONT
LASONT
Las Vegas Harry Reid Intl
Sat 3/7
5:05 pm-6:15 pm
Nonstop1h 10m
Ontario
Wed 3/11
2:23 pm-3:37 pm
Nonstop1h 14m
$58
Las VegasOntario
LAS - ONT
LASONT
Las Vegas Harry Reid Intl
Wed 2/18
12:00 pm-1:11 pm
Nonstop1h 11m
Ontario
Thu 2/19
7:22 pm-8:31 pm
Nonstop1h 09m
$58
Las VegasOntario
LAS - ONT
LASONT
Las Vegas Harry Reid Intl
Sat 2/21
12:00 pm-1:11 pm
Nonstop1h 11m
Ontario
Sun 2/22
3:24 pm-4:36 pm
Nonstop1h 12m
$58
Las VegasOntario
LAS - ONT
LASONT
Las Vegas Harry Reid Intl
Fri 3/13
7:00 am-8:06 am
Nonstop1h 06m
Ontario
Sun 3/15
1:55 pm-3:07 pm
Nonstop1h 12m
$58
Las VegasOntario
LAS - ONT
LASONT
Las Vegas Harry Reid Intl
Sat 3/28
5:26 pm-6:36 pm
Nonstop1h 10m
Ontario
Sat 4/4
12:38 pm-1:48 pm
Nonstop1h 10m
$59
Las VegasOntario
LAS - ONT
LASONT
Las Vegas Harry Reid Intl
Mon 2/16
4:39 pm-5:48 pm
Nonstop1h 09m
Ontario
Wed 2/18
2:06 pm-3:20 pm
Nonstop1h 14m
$83
Las VegasOntario
LAS - ONT
LASONT
Las Vegas Harry Reid Intl
Wed 3/18
12:17 pm-1:28 pm
Nonstop1h 11m
Ontario
Fri 3/20
3:30 pm-4:40 pm
Nonstop1h 10m
$99
Las VegasOntario
LAS - ONT
LASONT
Las Vegas Harry Reid Intl
Thu 2/26
5:17 pm-6:27 pm
Nonstop1h 10m
Ontario
Mon 3/2
2:06 pm-11:29 pm
1 stop9h 23m
$103
Showing 1-10 of 60 results
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
STS-ONT
SFO-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
STS-ONT
SFO-ONT
What is the cheapest month to book a flight from California to Ontario?
Currently, February is the cheapest month in which you can book a flight from California to Ontario (average of $20). Flying from California to Ontario in September is currently the most expensive (average of $60). 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 February 9, 2026.
It’s typically best to fly out from California to Ontario in the evening. Doing so could potentially save you 14% on the flight price compared to flying at noon, which is usually more expensive.
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 February 7, 2026.
Travelers seeking maximum savings on their California to Ontario flight should consider departing on Saturday 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 February 9, 2026.
See what other customers who have flown with Alaska Airlines, Southwest, and United Airlines 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.
Crew
8.5
Food
7.1
Overall
8.0
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Food
7.1
Overall
8.0
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Food
7.1
Overall
8.0
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Food
7.1
Overall
8.0
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Food
7.1
Overall
8.0
Boarding
8.1
Entertainment
7.0
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Food
7.1
Overall
8.0
Boarding
8.1
Entertainment
7.0
Comfort
7.8
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.
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Ontario flight routes
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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 February 9, 2026.
California and Ontario flights
Browse other California and Ontario flight options. Last updated on February 9, 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 6 airlines flying from California to Ontario
Discover the top 6 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 February 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$27 | Average$139 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$60 | Average$257 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$97 | Average$235 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$107 | Average$264 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$113 | Average$280 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$186 | Average$206 | FlexibilityNo cancel fee | On-time71% |