$39+ 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 10/30. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ONT
Sep 22 — Sep 291
Round-trip
1 adult, Economy
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Find cheap flights from California to Ontario with Cheapflights
1. Tell us where you want to go
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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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from California to Ontario
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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 August 23, 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 August 23, 2026.
This Super.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:02 pm -
Nonstop1h 34m
Fri 9/1112:07 pm -
Nonstop1h 36m
Deal found 8/19![Frontier logo]()
$57
This Booking.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 9/812:57 pm -
Nonstop1h 30m
Fri 9/1112:07 pm -
Nonstop1h 36m
Deal found 8/18![Frontier logo]()
$58
This CheapOair deal was found by Cheapflights users on 8/22. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/256:02 pm -
Nonstop1h 34m
Mon 9/2812:07 pm -
Nonstop1h 36m
Deal found 8/22![Frontier logo]()
$59
This Kiwi.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/812:57 pm -
Nonstop1h 30m
Thu 9/1012:07 pm -
Nonstop1h 36m
Deal found 8/19![Frontier logo]()
$61
This Kiwi.com deal was found by Cheapflights users on 8/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/116:02 pm -
Nonstop1h 34m
Mon 9/1412:07 pm -
Nonstop1h 36m
Deal found 8/22![Frontier logo]()
$64
This eDestinos deal was found by Cheapflights users on 8/21. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:02 pm -
Nonstop1h 34m
Thu 9/1712:07 pm -
Nonstop1h 36m
Deal found 8/21![Frontier logo]()
$65
This Super.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:02 pm -
Nonstop1h 34m
Mon 9/2112:07 pm -
Nonstop1h 36m
Deal found 8/18![Frontier logo]()
$66
This Expedia deal was found by Cheapflights users on 8/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/146:02 pm -
Nonstop1h 34m
Thu 9/1712:07 pm -
Nonstop1h 36m
Deal found 8/21![Frontier logo]()
$67
This Trip.com deal was found by Cheapflights users on 8/21. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/56:02 pm -
Nonstop1h 26m
Thu 11/1212:01 pm -
Nonstop1h 35m
Deal found 8/21![Frontier logo]()
$69
This FlightHub deal was found by Cheapflights users on 8/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/196:02 pm -
Nonstop1h 38m
Fri 10/2312:01 pm -
Nonstop1h 31m
Deal found 8/21![Frontier logo]()
$70
This Super.com deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/198:00 am -
Nonstop1h 09m
Mon 9/218:24 pm -
Nonstop1h 11m
Deal found 8/17![Frontier logo]()
$102
This Super.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/153:45 pm -
Nonstop1h 14m
Wed 9/1610:04 am -
Nonstop1h 14m
Deal found 8/18![Frontier logo]()
$106
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 August 23, 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 August 23, 2026.
This Southwest deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” 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 11/311:45 am -
1 stop4h 25m
Thu 11/125:35 am -
1 stop3h 25m
Deal found 8/20![Southwest logo]()
$137
This Alaska Airlines deal was found by Cheapflights users on 8/22. 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.
Tue 9/222:09 pm -
Nonstop1h 38m
Sat 9/264:27 pm -
Nonstop1h 40m
Deal found 8/22![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 10/611:21 am -
1 stop5h 02m
Tue 10/136:00 am -
1 stop4h 41m
Deal found 8/18![Delta logo]()
$177
This United Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1710:37 am -
Nonstop1h 35m
Wed 9/236:08 am -
Nonstop1h 27m
Deal found 8/20![United Airlines logo]()
$187
This Frontier deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/129:03 am -
1 stop7h 31m
Sat 9/1910:04 am -
1 stop8h 14m
Deal found 8/19![Frontier logo]()
$210
This Mytrip deal was found by Cheapflights users on 8/22. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/228:00 am -
Nonstop1h 09m
Tue 9/294:27 pm -
1 stop22h 57m
Deal found 8/22![Multiple Airlines logo]()
$248
This Southwest deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/16:20 am -
1 stop5h 05m
Mon 10/56:55 pm -
1 stop5h 00m
Deal found 8/20![Southwest logo]()
$137
This Alaska Airlines deal was found by Cheapflights users on 8/22. 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 10/283:32 pm -
Nonstop1h 33m
Wed 11/46:44 pm -
Nonstop1h 36m
Deal found 8/22![Alaska Airlines logo]()
$157
This Southwest deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 9/304:40 pm -
1 stop4h 20m
Mon 10/55:15 pm -
2 stops7h 20m
Deal found 8/17![Southwest logo]()
$156
This Alaska Airlines deal was found by Cheapflights users on 8/22. 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 9/192:09 pm -
Nonstop1h 38m
Mon 9/214:27 pm -
Nonstop1h 40m
Deal found 8/22![Alaska Airlines logo]()
$157
This Delta deal was found by Cheapflights users on 8/22. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/64:49 pm -
1 stop7h 06m
Wed 10/146:00 am -
1 stop4h 41m
Deal found 8/22![Delta logo]()
$177
This United Airlines deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/179:17 pm -
Nonstop1h 34m
Mon 9/219:01 am -
Nonstop1h 29m
Deal found 8/18![United Airlines logo]()
$187
This Southwest deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/15:05 am -
1 stop5h 15m
Tue 10/69:15 am -
2 stops7h 55m
Deal found 8/17![Southwest logo]()
$156
This Alaska Airlines deal was found by Cheapflights users on 8/22. 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 9/192:09 pm -
Nonstop1h 38m
Sat 9/264:27 pm -
Nonstop1h 40m
Deal found 8/22![Alaska Airlines logo]()
$157
This United Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/291:41 pm -
Nonstop1h 41m
Mon 10/56:07 am -
Nonstop1h 27m
Deal found 8/17![United Airlines logo]()
$187
This Southwest deal was found by Cheapflights users on 8/22. 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 9/222:35 pm -
2 stops6h 25m
Tue 9/291:10 pm -
2 stops6h 00m
Deal found 8/22![Southwest logo]()
$161
This United Airlines deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” 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 9/124:40 pm -
Nonstop1h 31m
Tue 9/159:01 am -
Nonstop1h 29m
Deal found 8/20![United Airlines logo]()
$187
This CheapOair deal was found by Cheapflights users on 8/22. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/3011:59 am -
1 stop22h 43m
Sun 11/12:23 pm -
1 stop24h 05m
Deal found 8/22![Frontier logo]()
$240
This United Airlines deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” 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 10/19:25 pm -
Nonstop1h 26m
Tue 10/61:52 pm -
Nonstop1h 29m
Deal found 8/17![United Airlines logo]()
$187
This Southwest deal was found by Cheapflights users on 8/21. 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.
Fri 10/24:50 pm -
1 stop4h 30m
Sat 10/35:30 am -
2 stops5h 35m
Deal found 8/21![Southwest logo]()
$176
This United Airlines deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:30 pm -
Nonstop1h 31m
Mon 9/141:56 pm -
Nonstop1h 29m
Deal found 8/19![United Airlines logo]()
$188
This Alaska Airlines deal was found by Cheapflights users on 8/22. 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.
Tue 11/33:09 pm -
Nonstop1h 30m
Tue 11/36:44 pm -
Nonstop1h 36m
Deal found 8/22![Alaska Airlines logo]()
$212
This Southwest deal was found by Cheapflights users on 8/22. 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.
Sat 9/194:40 pm -
Nonstop1h 25m
Sat 9/2610:15 am -
1 stop3h 55m
Deal found 8/22![Southwest logo]()
$187
This United Airlines deal was found by Cheapflights users on 8/21. 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.
Thu 10/19:25 pm -
Nonstop1h 26m
Mon 10/56:07 am -
Nonstop1h 27m
Deal found 8/21![United Airlines logo]()
$188
This Alaska Airlines deal was found by Cheapflights users on 8/22. 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 10/283:32 pm -
Nonstop1h 33m
Fri 10/305:45 pm -
Nonstop1h 40m
Deal found 8/22![Alaska Airlines logo]()
$217
This Frontier deal was found by Cheapflights users on 8/22. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/42:53 pm -
1 stop8h 57m
Tue 9/86:00 am -
1 stop7h 47m
Deal found 8/22![Frontier logo]()
$290
This Southwest deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 9/144:30 pm -
Nonstop1h 20m
Wed 9/169:10 am -
Nonstop1h 20m
Deal found 8/18![Southwest logo]()
$197
This Alaska Airlines deal was found by Cheapflights users on 8/22. 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 10/283:32 pm -
Nonstop1h 33m
Thu 10/295:45 pm -
Nonstop1h 40m
Deal found 8/22![Alaska Airlines logo]()
$217
This United Airlines deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” 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 9/1110:37 am -
Nonstop1h 35m
Sat 9/126:08 am -
Nonstop1h 27m
Deal found 8/19![United Airlines logo]()
$204
This Justfly.com deal was found by Cheapflights users on 8/22. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/46:09 pm -
1 stop16h 53m
Mon 9/73:40 pm -
Nonstop1h 11m
Deal found 8/22![Frontier logo]()
$329
Last-minute flights from California to OntarioDiscover last-minute flight deals from California to Ontario. Data last updated August 23, 2026 and is based on user searches.
Discover last-minute flight deals from California to Ontario. Data last updated August 23, 2026 and is based on user searches.
This Booking.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 9/812:57 pm -
Nonstop1h 30m
Fri 9/1112:07 pm -
Nonstop1h 36m
Deal found 8/18![Frontier logo]()
$58
This Kiwi.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/812:57 pm -
Nonstop1h 30m
Thu 9/1012:07 pm -
Nonstop1h 36m
Deal found 8/19![Frontier logo]()
$61
This Super.com deal was found by Cheapflights users on 8/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:02 pm -
Nonstop1h 34m
Fri 9/1112:07 pm -
Nonstop1h 36m
Deal found 8/19![Frontier logo]()
$57
This eDestinos deal was found by Cheapflights users on 8/21. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:02 pm -
Nonstop1h 34m
Thu 9/1712:07 pm -
Nonstop1h 36m
Deal found 8/21![Frontier logo]()
$65
This Super.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1010:03 am -
Nonstop1h 19m
Tue 9/1510:04 am -
Nonstop1h 14m
Deal found 8/18![Frontier logo]()
$107
This Kiwi.com deal was found by Cheapflights users on 8/22. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/116:02 pm -
Nonstop1h 34m
Mon 9/1412:07 pm -
Nonstop1h 36m
Deal found 8/22![Frontier logo]()
$64
This Super.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” 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 9/116:02 pm -
Nonstop1h 34m
Fri 9/1812:07 pm -
Nonstop1h 36m
Deal found 8/20![Frontier logo]()
$77
This Expedia deal was found by Cheapflights users on 8/21. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/146:02 pm -
Nonstop1h 34m
Thu 9/1712:07 pm -
Nonstop1h 36m
Deal found 8/21![Frontier logo]()
$67
This Super.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/153:45 pm -
Nonstop1h 14m
Wed 9/1610:04 am -
Nonstop1h 14m
Deal found 8/18![Frontier logo]()
$106
This Super.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/176:02 pm -
Nonstop1h 34m
Mon 9/2112:07 pm -
Nonstop1h 36m
Deal found 8/18![Frontier logo]()
$66
This Super.com deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/198:00 am -
Nonstop1h 09m
Mon 9/218:24 pm -
Nonstop1h 11m
Deal found 8/17![Frontier logo]()
$102
This CheapOair deal was found by Cheapflights users on 8/22. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/256:02 pm -
Nonstop1h 34m
Mon 9/2812:07 pm -
Nonstop1h 36m
Deal found 8/22![Frontier logo]()
$59
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 August 23, 2026.
Search for one-way flight options from California to Ontario. Find affordable one-way fares based on user searches. Data last updated August 23, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/306:02 pm -
Nonstop1h 26m
Deal found 8/20![Frontier logo]()
$39
This Super.com deal was found by Cheapflights users on 8/22. 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 9/286:02 pm -
Nonstop1h 34m
Deal found 8/22![Frontier logo]()
$43
This Super.com deal was found by Cheapflights users on 8/21. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/107:41 am -
Nonstop1h 29m
Deal found 8/21![Frontier logo]()
$44
This Trip.com deal was found by Cheapflights users on 8/22. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/86:02 pm -
Nonstop1h 38m
Deal found 8/22![Frontier logo]()
$45
This Frontier deal was found by Cheapflights users on 8/21. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/216:02 pm -
Nonstop1h 34m
Deal found 8/21![Frontier logo]()
$47
This Mytrip deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/96:02 pm -
Nonstop1h 38m
Deal found 8/18![Frontier logo]()
$53
This Kissandfly.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/812:57 pm -
Nonstop1h 30m
Deal found 8/18![Frontier logo]()
$57
This Super.com deal was found by Cheapflights users on 8/22. 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.
Tue 9/2911:17 am -
1 stop5h 42m
Deal found 8/22![Frontier logo]()
$58
This United Airlines deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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.
Mon 9/144:40 pm -
Nonstop1h 31m
Deal found 8/18![United Airlines logo]()
$59
This Southwest deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 9/176:30 am -
Nonstop1h 20m
Deal found 8/18![Southwest logo]()
$59
This Super.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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 10/122:15 pm -
1 stop18h 54m
Deal found 8/18![Frontier logo]()
$64
This Booking.com deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” 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.
Thu 10/11:38 pm -
1 stop17h 26m
Deal found 8/18![Frontier logo]()
$65
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 August 23, 2026.
Round-trip from | $57 (Super.com) |
|---|---|
One-way from | $39 (Kiwi.com) |
Good round-trip deal | $124 or less |
Good one-way deal | $75 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 7,457,451 searches. Data last updated August 23, 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 San Jose - ONT Ontario
SJCONT
San Jose
Tue 11/3
11:45 am-4:10 pm
1 stop4h 25m
Ontario
Thu 11/12
5:35 am-9:00 am
1 stop3h 25m
$137
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Thu 10/1
6:20 am-11:25 am
1 stop5h 05m
Ontario
Mon 10/5
6:55 pm-11:55 pm
1 stop5h 00m
$137
San FranciscoOntario
SFO San Francisco - ONT Ontario
SFOONT
San Francisco
Wed 9/30
4:40 pm-9:00 pm
1 stop4h 20m
Ontario
Mon 10/5
5:15 pm-12:35 am
2 stops7h 20m
$156
San FranciscoOntario
SFO San Francisco - ONT Ontario
SFOONT
San Francisco
Thu 10/1
5:05 am-10:20 am
1 stop5h 15m
Ontario
Tue 10/6
9:15 am-5:10 pm
2 stops7h 55m
$156
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Tue 9/22
2:09 pm-3:47 pm
Nonstop1h 38m
Ontario
Sat 9/26
4:27 pm-6:07 pm
Nonstop1h 40m
$157
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Wed 10/28
3:32 pm-5:05 pm
Nonstop1h 33m
Ontario
Wed 11/4
6:44 pm-8:20 pm
Nonstop1h 36m
$157
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Sat 9/19
2:09 pm-3:47 pm
Nonstop1h 38m
Ontario
Mon 9/21
4:27 pm-6:07 pm
Nonstop1h 40m
$157
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Sat 9/19
2:09 pm-3:47 pm
Nonstop1h 38m
Ontario
Sat 9/26
4:27 pm-6:07 pm
Nonstop1h 40m
$157
San FranciscoOntario
SFO San Francisco - ONT Ontario
SFOONT
San Francisco
Tue 9/22
2:35 pm-9:00 pm
2 stops6h 25m
Ontario
Tue 9/29
1:10 pm-7:10 pm
2 stops6h 00m
$161
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Fri 10/2
4:50 pm-9:20 pm
1 stop4h 30m
Ontario
Sat 10/3
5:30 am-11:05 am
2 stops5h 35m
$176
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.
SJC-ONT
STS-ONT
SFO-ONT
RNO-ONT
LAS-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
SJC-ONT
STS-ONT
SFO-ONT
RNO-ONT
What is the cheapest month to book a flight from California to Ontario?
Currently, September is the cheapest month in which you can book a flight from California to Ontario (average of $193). Flying from California to Ontario in February is currently the most expensive (average of $337). 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 August 23, 2026.
It’s typically best to fly out from California to Ontario in the evening. Doing so could potentially save you 8% 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 August 22, 2026.
Travelers seeking maximum savings on their California to Ontario flight should consider departing on Wednesday mornings 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 August 23, 2026.
See what other customers who have flown with Southwest,Alaska Airlines, 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.
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Comfort
8.0
Crew
8.6
Food
7.0
Overall
8.0
Entertainment
7.5
Boarding
8.1
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - 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.
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Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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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 August 23, 2026.
California and Ontario flights
Browse other California and Ontario flight options. Last updated on August 23, 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 7,457,451 searches. Data last updated August 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$39 | Average$173 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$66 | Average$169 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$109 | Average$311 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$117 | Average$237 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$142 | Average$302 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$151 | Average$290 | FlexibilityNo cancel fee | On-time63% |