$37+ Cheap flights from Ontario (ONT) to California
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/18. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — LAX
Sep 30 — Oct 71
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to California 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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
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 Ontario to California
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Cheapest flights from Ontario to CaliforniaExplore the most affordable flight options available from Ontario to California. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 31, 2026.
Explore the most affordable flight options available from Ontario to California. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 31, 2026.
This Super.com deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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 9/1812:07 pm -
Nonstop1h 36m
Mon 9/216:02 pm -
Nonstop1h 34m
Deal found 8/27![Frontier logo]()
$66
This Super.com deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” 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 9/1012:07 pm -
Nonstop1h 36m
Fri 9/116:02 pm -
Nonstop1h 34m
Deal found 8/29![Frontier logo]()
$67
This Booking.com deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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.
Sun 9/68:48 am -
Nonstop1h 27m
Thu 9/106:02 pm -
Nonstop1h 34m
Deal found 8/30![Frontier logo]()
$68
This CheapOair deal was found by Cheapflights users on 8/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2812:07 pm -
Nonstop1h 36m
Thu 10/16:02 pm -
Nonstop1h 34m
Deal found 8/26![Frontier logo]()
$69
This Super.com deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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 9/13:13 pm -
Nonstop1h 27m
Tue 9/812:57 pm -
Nonstop1h 30m
Deal found 8/30![Frontier logo]()
$72
This Expedia deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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.
Sat 9/58:48 am -
Nonstop1h 27m
Tue 9/812:57 pm -
Nonstop1h 30m
Deal found 8/30![Frontier logo]()
$73
This FlightHub deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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.
Thu 9/38:48 am -
Nonstop1h 27m
Thu 9/106:02 pm -
Nonstop1h 34m
Deal found 8/30![Frontier logo]()
$76
This Super.com deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” 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 9/13:13 pm -
Nonstop1h 27m
Thu 9/39:00 am -
Nonstop1h 29m
Deal found 8/28![Frontier logo]()
$77
This Mytrip deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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.
Mon 8/318:48 am -
Nonstop1h 27m
Tue 9/112:57 pm -
Nonstop1h 30m
Deal found 8/30![Frontier logo]()
$78
This Expedia deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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.
Thu 9/172:30 pm -
1 stop20h 25m
Mon 9/216:02 pm -
Nonstop1h 34m
Deal found 8/27![Frontier logo]()
$83
This CheapOair deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/81:38 pm -
1 stop5h 26m
Mon 10/126:02 pm -
Nonstop1h 38m
Deal found 8/27![Frontier logo]()
$85
This Southwest deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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 10/76:20 am -
Nonstop1h 15m
Wed 10/73:05 pm -
Nonstop1h 15m
Deal found 8/27![Southwest logo]()
$117
Best flights from Ontario to CaliforniaDiscover carefully curated flight deals from Ontario to California that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 31, 2026.
Discover carefully curated flight deals from Ontario to California that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 31, 2026.
This Southwest deal was found by Cheapflights users on 8/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/226:25 pm -
Nonstop1h 10m
Tue 9/297:15 am -
Nonstop1h 15m
Deal found 8/26![Southwest logo]()
$117
This Alaska Airlines deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” 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 10/245:45 pm -
Nonstop1h 40m
Wed 10/283:32 pm -
Nonstop1h 33m
Deal found 8/28![Alaska Airlines logo]()
$157
This United Airlines deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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 9/236:08 am -
Nonstop1h 27m
Thu 9/247:00 pm -
Nonstop1h 31m
Deal found 8/27![United Airlines logo]()
$187
This Delta deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/286:00 am -
1 stop6h 20m
Tue 11/35:30 am -
1 stop7h 06m
Deal found 8/29![Delta logo]()
$197
This Southwest deal was found by Cheapflights users on 8/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/173:40 pm -
Nonstop1h 15m
Fri 9/186:45 am -
1 stop6h 40m
Deal found 8/26![Southwest logo]()
$144
This Alaska Airlines deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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 10/105:45 pm -
Nonstop1h 40m
Wed 10/143:32 pm -
Nonstop1h 33m
Deal found 8/30![Alaska Airlines logo]()
$157
This Southwest deal was found by Cheapflights users on 8/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/234:45 pm -
1 stop4h 35m
Wed 9/3010:40 am -
2 stops10h 20m
Deal found 8/26![Southwest logo]()
$156
This Alaska Airlines deal was found by Cheapflights users on 8/26. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/14:27 pm -
Nonstop1h 40m
Sun 10/43:32 pm -
Nonstop1h 33m
Deal found 8/26![Alaska Airlines logo]()
$167
This Southwest deal was found by Cheapflights users on 8/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/55:15 pm -
2 stops7h 20m
Thu 10/85:05 am -
1 stop5h 15m
Deal found 8/26![Southwest logo]()
$156
This Southwest deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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 9/231:15 pm -
2 stops8h 15m
Wed 9/306:00 am -
2 stops7h 35m
Deal found 8/27![Southwest logo]()
$161
This United Airlines deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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 2/161:33 pm -
1 stop5h 13m
Sat 2/277:25 am -
1 stop4h 55m
Deal found 8/30![United Airlines logo]()
$235
This Alaska Airlines deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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 9/224:27 pm -
Nonstop1h 40m
Wed 9/232:09 pm -
Nonstop1h 38m
Deal found 8/30![Alaska Airlines logo]()
$217
This Southwest deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” 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 9/309:10 am -
Nonstop1h 20m
Wed 9/304:30 pm -
1 stop4h 30m
Deal found 8/29![Southwest logo]()
$187
This United Airlines deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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 9/196:08 am -
1 stop3h 25m
Wed 9/236:30 am -
1 stop5h 42m
Deal found 8/27![United Airlines logo]()
$267
This Southwest deal was found by Cheapflights users on 8/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/264:20 pm -
Nonstop1h 30m
Mon 9/2811:15 am -
Nonstop1h 25m
Deal found 8/26![Southwest logo]()
$204
This United Airlines deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” 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 11/171:35 pm -
Nonstop1h 30m
Thu 11/196:50 pm -
Nonstop1h 25m
Deal found 8/28![United Airlines logo]()
$292
This Delta deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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 11/76:01 pm -
1 stop5h 17m
Wed 11/116:04 am -
1 stop5h 13m
Deal found 8/27![Delta logo]()
$367
This Southwest deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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 9/227:15 am -
Nonstop1h 20m
Tue 9/223:20 pm -
2 stops5h 40m
Deal found 8/27![Southwest logo]()
$212
This Delta deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” 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.
Fri 9/256:00 pm -
1 stop5h 17m
Sat 9/2612:22 pm -
1 stop4h 57m
Deal found 8/29![Delta logo]()
$367
This United Airlines deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” 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 9/215:00 am -
1 stop5h 49m
Mon 9/215:07 pm -
1 stop5h 44m
Deal found 8/28![United Airlines logo]()
$305
This Delta deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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.
Fri 10/166:01 pm -
1 stop5h 17m
Mon 10/1912:20 pm -
1 stop4h 52m
Deal found 8/27![Delta logo]()
$367
This Alaska Airlines deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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 11/66:44 pm -
2 stops19h 59m
Tue 11/102:12 pm -
1 stop19h 32m
Deal found 8/27![Alaska Airlines logo]()
$341
This Southwest deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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 11/136:30 am -
1 stop7h 10m
Mon 11/166:45 am -
2 stops9h 25m
Deal found 8/27![Southwest logo]()
$234
This United Airlines deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” 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 9/219:01 am -
Nonstop1h 29m
Tue 9/2212:30 pm -
Nonstop1h 31m
Deal found 8/29![United Airlines logo]()
$315
This Delta deal was found by Cheapflights users on 8/26. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/256:00 pm -
1 stop5h 17m
Tue 9/296:13 am -
1 stop5h 01m
Deal found 8/26![Delta logo]()
$367
This Southwest deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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 10/16:15 pm -
Nonstop1h 25m
Tue 10/610:40 am -
Nonstop1h 20m
Deal found 8/30![Southwest logo]()
$236
This United Airlines deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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 9/151:56 pm -
Nonstop1h 29m
Thu 11/59:20 pm -
Nonstop1h 28m
Deal found 8/30![United Airlines logo]()
$316
This Alaska Airlines deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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 9/3012:12 pm -
1 stop6h 09m
Mon 10/56:37 pm -
1 stop5h 05m
Deal found 8/27![Alaska Airlines logo]()
$367
This Southwest deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” 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 9/306:40 am -
1 stop4h 30m
Tue 10/69:55 am -
2 stops5h 45m
Deal found 8/28![Southwest logo]()
$241
This United Airlines deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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 9/116:08 am -
1 stop4h 07m
Sun 9/136:45 pm -
1 stop4h 06m
Deal found 8/30![United Airlines logo]()
$329
Last-minute flights from Ontario to CaliforniaDiscover last-minute flight deals from Ontario to California. Data last updated August 31, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to California. Data last updated August 31, 2026 and is based on user searches.
This Mytrip deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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.
Mon 8/318:48 am -
Nonstop1h 27m
Tue 9/112:57 pm -
Nonstop1h 30m
Deal found 8/30![Frontier logo]()
$78
This Super.com deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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 9/13:13 pm -
Nonstop1h 27m
Tue 9/812:57 pm -
Nonstop1h 30m
Deal found 8/30![Frontier logo]()
$72
This Super.com deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” 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 9/13:13 pm -
Nonstop1h 27m
Thu 9/39:00 am -
Nonstop1h 29m
Deal found 8/28![Frontier logo]()
$77
This FlightHub deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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.
Thu 9/38:48 am -
Nonstop1h 27m
Thu 9/106:02 pm -
Nonstop1h 34m
Deal found 8/30![Frontier logo]()
$76
This Expedia deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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.
Sat 9/58:48 am -
Nonstop1h 27m
Tue 9/812:57 pm -
Nonstop1h 30m
Deal found 8/30![Frontier logo]()
$73
This Booking.com deal was found by Cheapflights users on 8/30. Clicking the “Pick Dates” 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.
Sun 9/68:48 am -
Nonstop1h 27m
Thu 9/106:02 pm -
Nonstop1h 34m
Deal found 8/30![Frontier logo]()
$68
This Super.com deal was found by Cheapflights users on 8/29. Clicking the “Pick Dates” 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 9/1012:07 pm -
Nonstop1h 36m
Fri 9/116:02 pm -
Nonstop1h 34m
Deal found 8/29![Frontier logo]()
$67
This Expedia deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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.
Thu 9/172:30 pm -
1 stop20h 25m
Mon 9/216:02 pm -
Nonstop1h 34m
Deal found 8/27![Frontier logo]()
$83
This Super.com deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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 9/1812:07 pm -
Nonstop1h 36m
Mon 9/216:02 pm -
Nonstop1h 34m
Deal found 8/27![Frontier logo]()
$66
This Southwest deal was found by Cheapflights users on 8/26. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/226:25 pm -
Nonstop1h 10m
Tue 9/297:15 am -
Nonstop1h 15m
Deal found 8/26![Southwest logo]()
$117
This CheapOair deal was found by Cheapflights users on 8/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2412:07 pm -
Nonstop1h 36m
Tue 9/2911:17 am -
1 stop5h 42m
Deal found 8/26![Frontier logo]()
$85
This CheapOair deal was found by Cheapflights users on 8/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2812:07 pm -
Nonstop1h 36m
Thu 10/16:02 pm -
Nonstop1h 34m
Deal found 8/26![Frontier logo]()
$69
One-way flights from Ontario to CaliforniaSearch for one-way flight options from Ontario to California. Find affordable one-way fares based on user searches. Data last updated August 31, 2026.
Search for one-way flight options from Ontario to California. Find affordable one-way fares based on user searches. Data last updated August 31, 2026.
This Trip.com deal was found by Cheapflights users on 8/26. 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.
Fri 9/1812:07 pm -
Nonstop1h 36m
Deal found 8/26![Frontier logo]()
$37
This Kiwi.com deal was found by Cheapflights users on 8/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/2312:01 pm -
Nonstop1h 31m
Deal found 8/26![Frontier logo]()
$39
This Super.com deal was found by Cheapflights users on 8/26. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/2812:07 pm -
Nonstop1h 36m
Deal found 8/26![Frontier logo]()
$43
This CheapOair deal was found by Cheapflights users on 8/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/912:01 pm -
Nonstop1h 31m
Deal found 8/26![Frontier logo]()
$44
This CheapOair deal was found by Cheapflights users on 8/26. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/87:11 am -
Nonstop1h 33m
Deal found 8/26![Frontier logo]()
$45
This Frontier deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1712:07 pm -
Nonstop1h 36m
Deal found 8/27![Frontier logo]()
$46
This Super.com deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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 10/81:38 pm -
1 stop5h 26m
Deal found 8/27![Frontier logo]()
$58
This Super.com deal was found by Cheapflights users on 8/26. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/288:00 am -
1 stop4h 43m
Deal found 8/26![Frontier logo]()
$59
This United Airlines deal was found by Cheapflights users on 8/27. Clicking the “Pick Dates” 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 9/261:52 pm -
Nonstop1h 29m
Deal found 8/27![United Airlines logo]()
$59
This Frontier deal was found by Cheapflights users on 8/26. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1010:04 am -
1 stop4h 21m
Deal found 8/26![Frontier logo]()
$60
This Super.com deal was found by Cheapflights users on 8/31. Clicking the “Pick Dates” 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 9/83:13 pm -
Nonstop1h 27m
Deal found 8/31![Frontier logo]()
$61
This FlightHub deal was found by Cheapflights users on 8/28. Clicking the “Pick Dates” 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.
Sat 9/1910:04 am -
1 stop4h 25m
Deal found 8/28![Frontier logo]()
$62
Find flight deals from Ontario to California
Keep the following information in mind while searching for Ontario to California flight deals. Data was last updated August 31, 2026.
Round-trip from | $66 (Super.com) |
|---|---|
One-way from | $37 (Trip.com) |
Good round-trip deal | $170 or less |
Good one-way deal | $110 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to California that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated August 31, 2026.
Use the filters below to find and compare flights from Ontario to California that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Quickest round-trip
OntarioSan Jose
ONT Ontario - SJC San Jose
ONTSJC
Ontario
Tue 9/22
6:25 pm-7:35 pm
Nonstop1h 10m
San Jose
Tue 9/29
7:15 am-8:30 am
Nonstop1h 15m
$117
OntarioSan Jose
ONT Ontario - SJC San Jose
ONTSJC
Ontario
Thu 9/17
3:40 pm-4:55 pm
Nonstop1h 15m
San Jose
Fri 9/18
6:45 am-1:25 pm
1 stop6h 40m
$144
OntarioSan Francisco
ONT Ontario - SFO San Francisco
ONTSFO
Ontario
Wed 9/23
4:45 pm-9:20 pm
1 stop4h 35m
San Francisco
Wed 9/30
10:40 am-9:00 pm
2 stops10h 20m
$156
OntarioSan Francisco
ONT Ontario - SFO San Francisco
ONTSFO
Ontario
Mon 10/5
5:15 pm-12:35 am
2 stops7h 20m
San Francisco
Thu 10/8
5:05 am-10:20 am
1 stop5h 15m
$156
OntarioSanta Rosa
ONT Ontario - STS Santa Rosa Sonoma County
ONTSTS
Ontario
Sat 10/24
5:45 pm-7:25 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Wed 10/28
3:32 pm-5:05 pm
Nonstop1h 33m
$157
OntarioSanta Rosa
ONT Ontario - STS Santa Rosa Sonoma County
ONTSTS
Ontario
Sat 10/10
5:45 pm-7:25 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Wed 10/14
3:32 pm-5:05 pm
Nonstop1h 33m
$157
OntarioSanta Rosa
ONT Ontario - STS Santa Rosa Sonoma County
ONTSTS
Ontario
Wed 9/23
1:15 pm-9:30 pm
2 stops8h 15m
Santa Rosa Sonoma County
Wed 9/30
6:00 am-1:35 pm
2 stops7h 35m
$161
OntarioSanta Rosa
ONT Ontario - STS Santa Rosa Sonoma County
ONTSTS
Ontario
Thu 10/1
4:27 pm-6:07 pm
Nonstop1h 40m
Santa Rosa Sonoma County
Sun 10/4
3:32 pm-5:05 pm
Nonstop1h 33m
$167
OntarioSan Francisco
ONT Ontario - SFO San Francisco
ONTSFO
Ontario
Wed 9/23
6:08 am-7:35 am
Nonstop1h 27m
San Francisco
Thu 9/24
7:00 pm-8:31 pm
Nonstop1h 31m
$187
OntarioSacramento
ONT Ontario - SMF Sacramento Intl
ONTSMF
Ontario
Wed 9/30
9:10 am-10:30 am
Nonstop1h 20m
Sacramento Intl
Wed 9/30
4:30 pm-9:00 pm
1 stop4h 30m
$187
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Ontario to California
Have a flexible travel schedule? Discover the best time to fly to California from Ontario with our price prediction graph.
ONT-SFO
ONT-SJC
ONT-STS
ONT-SMF
ONT-LAS
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Ontario to California
ONT-USCA
ONT-SFO
ONT-SJC
ONT-STS
ONT-SMF
What is the cheapest month to book a flight from Ontario to California?
Currently, October is the cheapest month in which you can book a flight from Ontario to California (average of $169). Flying from Ontario to California in February is currently the most expensive (average of $321). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from ONT to CA?
Find hourly flight availability from Ontario to California. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 31, 2026.
Unlike in the morning, when flights are generally more expensive, you can save up to 17% on flights from Ontario to California by exploring options for tickets in the evening.
How far ahead should I book a flight from Ontario to California?
The price you pay for your flight from Ontario to California may vary depending on when you book. For the best chance of a lower fare, look to book 72 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest day to fly from Ontario to California?
Use this chart to determine the cheapest time to fly round-trip from Ontario to California. Price data was last updated on August 22, 2026.
Travelers seeking maximum savings on their Ontario to California flight should consider departing on Saturday at noon when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing California
Get insights into the airlines that provide service to California. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to California. Reviews last updated August 31, 2026.
Get a feel of what it's like to fly with Southwest,Alaska Airlines, andUnited Airlines from Ontario to California by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Food
7.0
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Food
7.0
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Food
7.0
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Food
7.0
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Food
7.0
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Food
7.0
Comfort
8.0
Entertainment
7.5
Overall
8.0
Boarding
8.1
Crew
8.6
Reviews
1 / 20
8.0
ExcellentWalter,Aug 2025
OAK - SAN
Related info for your journey
Find useful and relevant information for your journey from Ontario to California. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Ontario to California
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to California by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to California by cabin class
Find flights from Ontario to California, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and California flights
Browse other Ontario and California flight options. Last updated on August 31, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to California flights
Consider these flights traveling from Ontario to California.
Top 5 airlines flying from Ontario to California
Discover the top 5 airlines that operate flights from Ontario to California. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated August 31, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$141 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$91 | Average$167 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$96 | Average$307 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$120 | Average$188 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$136 | Average$327 | FlexibilityNo cancel fee | On-time63% |