$34+ 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 4/10. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ONT
Apr 25 — May 24
One-way
4 travelers, 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 March 26, 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 March 26, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/711:00 am
LAS
- ONT
Nonstop1h 09m
Frontier
Wed 4/84:52 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 3/24![Frontier logo]()
$67
This CheapOair deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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.
Fri 4/107:02 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Mon 4/139:02 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 3/25![Frontier logo]()
$68
This Frontier deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 4/165:46 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Sun 4/199:09 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 3/25![Frontier logo]()
$69
This Kiwi.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/126:22 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Sun 5/174:04 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 3/24![Frontier logo]()
$79
This CheapOair deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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.
Fri 5/17:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Sun 5/31:54 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 3/25![Frontier logo]()
$80
This Frontier deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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 4/225:41 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Wed 4/2911:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Deal found 3/23![Frontier logo]()
$85
This Frontier deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 4/97:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Thu 4/911:00 am
ONT
- LAS
Nonstop1h 15m
Frontier
Deal found 3/25![Frontier logo]()
$88
This Trip.com deal was found by Cheapflights users on 3/26. Clicking the “Pick Dates” 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.
Thu 5/141:59 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Sun 5/174:04 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 3/26![Frontier logo]()
$89
This Super.com deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 4/1110:30 am
LAS
- ONT
Nonstop1h 09m
Frontier
Sun 4/1210:35 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 3/25![Frontier logo]()
$92
This Frontier deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 4/209:00 am
LAS
- ONT
Nonstop1h 14m
Frontier
Mon 4/208:59 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 3/24![Frontier logo]()
$93
This Frontier deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 4/189:30 am
LAS
- ONT
Nonstop1h 14m
Frontier
Sun 4/199:09 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 3/25![Frontier logo]()
$94
This Frontier deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 4/152:47 pm
SFO
- ONT
1 stop4h 02m
Frontier
Thu 4/169:10 am
ONT
- SFO
Nonstop1h 40m
Frontier
Deal found 3/24![Frontier logo]()
$98
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 March 26, 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 March 26, 2026.
This Alaska Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 5/210:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Tue 5/512:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Deal found 3/25![Alaska Airlines logo]()
$117
This Southwest deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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 4/217:05 am
LAS
- ONT
1 stop4h 50m
Southwest
Tue 4/2812:40 pm
ONT
- LAS
1 stop4h 05m
Southwest
Deal found 3/22![Southwest logo]()
$183
This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 5/96:00 am
RNO
- ONT
1 stop6h 22m
United Airlines
Tue 5/121:30 pm
ONT
- RNO
1 stop4h 11m
United Airlines
Deal found 3/25![United Airlines logo]()
$191
This Delta deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 5/95:13 pm
RNO
- ONT
1 stop5h 32m
Delta
Mon 5/184:57 pm
ONT
- RNO
1 stop6h 28m
Delta
Deal found 3/25![Delta logo]()
$207
This CheapOair deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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.
Sat 4/116:00 am
LAS
- ONT
1 stop17h 56m
Frontier
Sun 4/126:10 pm
ONT
- LAS
1 stop19h 22m
Frontier
Deal found 3/25![Frontier logo]()
$212
This Alaska Airlines deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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 5/210:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Wed 5/612:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Deal found 3/22![Alaska Airlines logo]()
$137
This Alaska Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 4/172:12 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Tue 4/214:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Deal found 3/25![Alaska Airlines logo]()
$147
This Southwest deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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 5/95:25 am
RNO
- ONT
1 stop3h 15m
Southwest
Tue 5/123:45 pm
ONT
- RNO
1 stop6h 45m
Southwest
Deal found 3/23![Southwest logo]()
$191
This Southwest deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” 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 4/1812:35 pm
SJC
- ONT
2 stops8h 10m
Southwest
Sat 4/2512:50 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 3/21![Southwest logo]()
$192
This CheapOair deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” 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 6/23:29 pm
RNO
- ONT
1 stop24h 15m
Frontier
Sun 6/711:51 am
ONT
- RNO
1 stop26h 37m
Frontier
Deal found 3/21![Frontier logo]()
$236
This Southwest deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 4/217:30 pm
SMF
- ONT
Nonstop1h 20m
Southwest
Tue 4/285:20 pm
ONT
- SMF
Nonstop1h 25m
Southwest
Deal found 3/24![Southwest logo]()
$197
This Alaska Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 5/165:44 pm
STS
- ONT
Nonstop1h 24m
Alaska Airlines
Thu 5/213:35 pm
ONT
- STS
Nonstop1h 29m
Alaska Airlines
Deal found 3/25![Alaska Airlines logo]()
$197
This United Airlines deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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 5/52:12 pm
RNO
- ONT
1 stop3h 40m
United Airlines
Wed 5/66:00 am
ONT
- RNO
1 stop3h 30m
United Airlines
Deal found 3/23![United Airlines logo]()
$245
This Delta deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 9/15:00 pm
SMF
- ONT
1 stop6h 44m
Delta
Thu 9/35:05 pm
ONT
- SMF
1 stop6h 31m
Delta
Deal found 3/24![Delta logo]()
$261
This Southwest deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/44:40 pm
STS
- ONT
2 stops6h 25m
Southwest
Mon 5/113:35 pm
ONT
- STS
2 stops7h 05m
Southwest
Deal found 3/21![Southwest logo]()
$207
This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 5/25:00 am
SMF
- ONT
1 stop7h 38m
United Airlines
Tue 5/56:00 am
ONT
- SMF
1 stop3h 47m
United Airlines
Deal found 3/25![United Airlines logo]()
$253
This Alaska Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 4/2610:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Thu 4/3012:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Deal found 3/25![Alaska Airlines logo]()
$217
This United Airlines deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 4/281:32 pm
RNO
- ONT
1 stop4h 30m
United Airlines
Sat 5/26:00 am
ONT
- RNO
1 stop3h 30m
United Airlines
Deal found 3/24![United Airlines logo]()
$261
This Alaska Airlines deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” 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 6/45:44 pm
STS
- ONT
Nonstop1h 24m
Alaska Airlines
Sat 6/63:35 pm
ONT
- STS
Nonstop1h 29m
Alaska Airlines
Deal found 3/21![Alaska Airlines logo]()
$217
This United Airlines deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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 4/256:00 am
LAS
- ONT
1 stop6h 20m
United Airlines
Tue 4/285:10 am
ONT
- LAS
1 stop7h 49m
United Airlines
Deal found 3/23![United Airlines logo]()
$269
This Southwest deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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 5/97:05 am
LAS
- ONT
2 stops8h 30m
Southwest
Sun 5/1010:30 am
ONT
- LAS
1 stop3h 55m
Southwest
Deal found 3/23![Southwest logo]()
$249
This Southwest deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 5/75:55 am
SMF
- ONT
Nonstop1h 20m
Southwest
Sun 5/107:40 pm
ONT
- SMF
1 stop5h 10m
Southwest
Deal found 3/25![Southwest logo]()
$250
This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 5/72:12 pm
RNO
- ONT
1 stop3h 40m
United Airlines
Sat 5/166:00 am
ONT
- RNO
1 stop3h 30m
United Airlines
Deal found 3/25![United Airlines logo]()
$277
This Alaska Airlines deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/94:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Sat 7/116:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Deal found 3/21![Alaska Airlines logo]()
$257
This Southwest deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 4/216:30 am
FAT
- ONT
2 stops7h 15m
Southwest
Tue 4/283:45 pm
ONT
- FAT
2 stops5h 55m
Southwest
Deal found 3/25![Southwest logo]()
$251
This United Airlines deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” 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 5/16:20 am
SMF
- ONT
1 stop3h 21m
United Airlines
Fri 5/156:00 am
ONT
- SMF
1 stop3h 47m
United Airlines
Deal found 3/21![United Airlines logo]()
$281
This Alaska Airlines deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” 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
Wed 4/156:00 am
ONT
- STS
1 stop12h 01m
Alaska Airlines
Deal found 3/21![Alaska Airlines logo]()
$260
This Southwest deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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 5/86:55 pm
SJC
- ONT
1 stop4h 10m
Southwest
Sat 5/912:50 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 3/23![Southwest logo]()
$253
This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 5/28:10 am
SFO
- ONT
Nonstop1h 31m
United Airlines
Mon 5/41:30 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Deal found 3/25![United Airlines logo]()
$286
This Alaska Airlines deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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 4/82:12 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Sat 4/184:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Deal found 3/22![Alaska Airlines logo]()
$277
Last-minute flights from California to OntarioDiscover last-minute flight deals from California to Ontario. Data last updated March 26, 2026 and is based on user searches.
Discover last-minute flight deals from California to Ontario. Data last updated March 26, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/711:00 am
LAS
- ONT
Nonstop1h 09m
Frontier
Wed 4/84:52 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 3/24![Frontier logo]()
$67
This Frontier deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 4/97:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Thu 4/911:00 am
ONT
- LAS
Nonstop1h 15m
Frontier
Deal found 3/25![Frontier logo]()
$88
This CheapOair deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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.
Fri 4/107:02 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Mon 4/139:02 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 3/25![Frontier logo]()
$68
This Super.com deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 4/1110:30 am
LAS
- ONT
Nonstop1h 09m
Frontier
Sun 4/1210:35 pm
ONT
- LAS
Nonstop1h 11m
Frontier
Deal found 3/25![Frontier logo]()
$92
This Alaska Airlines deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 4/142:12 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Tue 4/214:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Deal found 3/24![Alaska Airlines logo]()
$117
This Frontier deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 4/159:20 pm
LAS
- ONT
1 stop10h 11m
Frontier
Thu 4/167:49 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 3/24![Frontier logo]()
$98
This Super.com deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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 4/159:30 am
LAS
- ONT
Nonstop1h 14m
Frontier
Wed 4/227:44 pm
ONT
- LAS
Nonstop1h 10m
Frontier
Deal found 3/23![Frontier logo]()
$102
This Frontier deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 4/165:46 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Sun 4/199:09 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 3/25![Frontier logo]()
$69
This Frontier deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 4/189:30 am
LAS
- ONT
Nonstop1h 14m
Frontier
Sun 4/199:09 pm
ONT
- LAS
Nonstop1h 12m
Frontier
Deal found 3/25![Frontier logo]()
$94
This Frontier deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 4/209:00 am
LAS
- ONT
Nonstop1h 14m
Frontier
Mon 4/208:59 pm
ONT
- LAS
Nonstop1h 09m
Frontier
Deal found 3/24![Frontier logo]()
$93
This Frontier deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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 4/225:41 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Wed 4/2911:44 am
ONT
- LAS
Nonstop1h 15m
Frontier
Deal found 3/23![Frontier logo]()
$85
This Alaska Airlines deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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 4/2210:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Wed 4/2912:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Deal found 3/23![Alaska Airlines logo]()
$137
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 March 26, 2026.
Search for one-way flight options from California to Ontario. Find affordable one-way fares based on user searches. Data last updated March 26, 2026.
This Super.com deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 4/107:02 pm
LAS
- ONT
Nonstop1h 05m
Frontier
Deal found 3/25![Frontier logo]()
$34
This Booking.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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.
Tue 4/145:41 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 3/24![Frontier logo]()
$35
This Kiwi.com deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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 5/66:22 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 3/24![Frontier logo]()
$39
This CheapOair deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 5/141:59 pm
LAS
- ONT
Nonstop1h 10m
Frontier
Deal found 3/25![Frontier logo]()
$40
This Frontier deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 5/262:32 pm
LAS
- ONT
Nonstop1h 12m
Frontier
Deal found 3/25![Frontier logo]()
$41
This Flightnetwork deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” 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.
Wed 5/202:32 pm
LAS
- ONT
Nonstop1h 12m
Frontier
Deal found 3/24![Frontier logo]()
$44
This Kiwi.com deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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 4/137:00 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 3/25![Frontier logo]()
$58
This Super.com deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” 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.
Sun 4/197:20 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 3/25![Frontier logo]()
$59
This Booking.com deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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.
Wed 4/155:41 pm
LAS
- ONT
Nonstop1h 08m
Frontier
Deal found 3/23![Frontier logo]()
$60
This Frontier deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” 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 4/247:20 am
LAS
- ONT
Nonstop1h 04m
Frontier
Deal found 3/23![Frontier logo]()
$61
This Super.com deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” 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 4/133:10 pm
SFO
- ONT
1 stop4h 57m
Frontier
Deal found 3/22![Frontier logo]()
$69
This Expedia deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/152:47 pm
SFO
- ONT
1 stop4h 02m
Frontier
Deal found 3/25![Frontier logo]()
$70
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 March 26, 2026.
Round-trip from | $67 (Kiwi.com) |
|---|---|
One-way from | $34 (Super.com) |
Good round-trip deal | $147 or less |
Good one-way deal | $78 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 March 26, 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
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Sat 5/2
10:41 am-12:08 pm
Nonstop1h 27m
Ontario
Tue 5/5
12:48 pm-2:20 pm
Nonstop1h 32m
$117
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Sat 5/2
10:41 am-12:08 pm
Nonstop1h 27m
Ontario
Wed 5/6
12:48 pm-2:20 pm
Nonstop1h 32m
$137
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Fri 4/17
2:12 pm-3:42 pm
Nonstop1h 30m
Ontario
Tue 4/21
4:22 pm-6:22 pm
Nonstop2h 00m
$147
Las VegasOntario
LAS - ONT
LASONT
Las Vegas Harry Reid Intl
Tue 4/21
7:05 am-11:55 am
1 stop4h 50m
Ontario
Tue 4/28
12:40 pm-4:45 pm
1 stop4h 05m
$183
RenoOntario
RNO - ONT
RNOONT
Reno
Sat 5/9
6:00 am-12:22 pm
1 stop6h 22m
Ontario
Tue 5/12
1:30 pm-5:41 pm
1 stop4h 11m
$191
RenoOntario
RNO - ONT
RNOONT
Reno
Sat 5/9
5:25 am-8:40 am
1 stop3h 15m
Ontario
Tue 5/12
3:45 pm-10:30 pm
1 stop6h 45m
$191
San JoseOntario
SJC - ONT
SJCONT
San Jose
Sat 4/18
12:35 pm-8:45 pm
2 stops8h 10m
Ontario
Sat 4/25
12:50 pm-2:05 pm
Nonstop1h 15m
$192
Quickest round-trip
SacramentoOntario
SMF - ONT
SMFONT
Sacramento Intl
Tue 4/21
7:30 pm-8:50 pm
Nonstop1h 20m
Ontario
Tue 4/28
5:20 pm-6:45 pm
Nonstop1h 25m
$197
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Sat 5/16
5:44 pm-7:08 pm
Nonstop1h 24m
Ontario
Thu 5/21
3:35 pm-5:04 pm
Nonstop1h 29m
$197
RenoOntario
RNO - ONT
RNOONT
Reno
Sat 5/9
5:13 pm-10:45 pm
1 stop5h 32m
Ontario
Mon 5/18
4:57 pm-11:25 pm
1 stop6h 28m
$207
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
SFO-ONT
STS-ONT
RNO-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
SFO-ONT
STS-ONT
RNO-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 $33). 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 March 26, 2026.
It’s typically best to fly out from California to Ontario in the evening. Doing so could potentially save you 11% 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 March 23, 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. Sunday afternoons 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 March 26, 2026.
See what other customers who have flown with Southwest,Alaska Airlines, andUnited 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.
Overall
8.0
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Overall
8.0
Comfort
8.0
Crew
8.6
Food
7.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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 March 26, 2026.
California and Ontario flights
Browse other California and Ontario flight options. Last updated on March 26, 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 March 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$27 | Average$153 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$67 | Average$258 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$97 | Average$235 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$107 | Average$265 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$117 | Average$275 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$186 | Average$221 | FlexibilityNo cancel fee | On-time71% |