$42+ Cheap flights from California to Ontario (ONT)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/25. Fares are subject to change and may not be available on all flights or dates of travel.
LAX — ONT
Nov 8 — Nov 151
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 October 9, 2026.
Explore the most affordable flight options available from California to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 9, 2026.
This Cheapflightsfares deal was found by Cheapflights users on 10/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/66:04 pm -
Nonstop1h 26m
Mon 11/912:01 pm -
Nonstop1h 35m
Deal found 10/7![Frontier logo]()
$74
This Kiwi.com deal was found by Cheapflights users on 10/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/39:56 pm -
Nonstop1h 23m
Fri 12/47:26 pm -
Nonstop1h 34m
Deal found 10/7![Frontier logo]()
$75
This Super.com deal was found by Cheapflights users on 10/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/56:04 pm -
Nonstop1h 26m
Thu 11/1212:01 pm -
Nonstop1h 35m
Deal found 10/7![Frontier logo]()
$76
This Booking.com deal was found by Cheapflights users on 10/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/56:04 pm -
Nonstop1h 26m
Mon 11/912:01 pm -
Nonstop1h 35m
Deal found 10/6![Frontier logo]()
$77
This Cheapflightsfares deal was found by Cheapflights users on 10/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/129:56 pm -
Nonstop1h 27m
Tue 12/152:41 pm -
1 stop23h 12m
Deal found 10/5![Frontier logo]()
$78
This Super.com deal was found by Cheapflights users on 10/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2510:59 pm -
Nonstop1h 25m
Wed 12/27:26 pm -
Nonstop1h 34m
Deal found 10/7![Frontier logo]()
$79
This Kiwi.com deal was found by Cheapflights users on 10/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/49:56 pm -
Nonstop1h 23m
Thu 12/107:26 pm -
Nonstop1h 35m
Deal found 10/7![Frontier logo]()
$80
This Super.com deal was found by Cheapflights users on 10/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/71:49 pm -
1 stop4h 42m
Tue 12/87:26 pm -
Nonstop1h 35m
Deal found 10/6![Frontier logo]()
$81
This Cheapflightsfares deal was found by Cheapflights users on 10/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/296:02 pm -
Nonstop1h 26m
Mon 11/212:01 pm -
Nonstop1h 35m
Deal found 10/7![Frontier logo]()
$82
This Cheapflightsfares deal was found by Cheapflights users on 10/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:02 pm -
Nonstop1h 38m
Thu 10/2912:01 pm -
Nonstop1h 35m
Deal found 10/7![Frontier logo]()
$84
This Super.com deal was found by Cheapflights users on 10/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:04 pm -
Nonstop1h 26m
Fri 11/1312:01 pm -
Nonstop1h 35m
Deal found 10/6![Frontier logo]()
$85
This Cheapflightsfares deal was found by Cheapflights users on 10/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/49:56 pm -
Nonstop1h 23m
Sat 12/127:26 pm -
Nonstop1h 35m
Deal found 10/7![Frontier logo]()
$86
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 October 9, 2026.
Discover carefully curated flight deals from California to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 9, 2026.
This Southwest deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/66:30 am -
Nonstop1h 15m
Fri 11/135:00 am -
2 stops6h 35m
Deal found 10/9![Southwest logo]()
$132
This Kiwi.com deal was found by Cheapflights users on 10/4. Clicking the “Pick Dates” 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 12/86:40 pm -
1 stop4h 43m
Sun 12/137:26 pm -
1 stop27h 38m
Deal found 10/4![Frontier logo]()
$153
This United Airlines deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/59:20 pm -
Nonstop1h 28m
Sat 11/76:00 am -
Nonstop1h 30m
Deal found 10/8![United Airlines logo]()
$207
This Southwest deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/135:05 am -
1 stop5h 35m
Sat 11/145:35 am -
1 stop4h 20m
Deal found 10/8![Southwest logo]()
$142
This Delta deal was found by Cheapflights users on 10/4. Clicking the “Pick Dates” 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 12/411:27 am -
1 stop4h 55m
Sat 12/126:00 am -
1 stop4h 42m
Deal found 10/4![Delta logo]()
$297
This Kiwi.com deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/58:44 am -
1 stop10h 46m
Thu 11/125:06 pm -
1 stop29h 32m
Deal found 10/8![Frontier logo]()
$156
This Alaska Airlines deal was found by Cheapflights users on 10/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/27:00 am -
1 stop11h 17m
Sat 11/76:00 am -
1 stop16h 40m
Deal found 10/6![Alaska Airlines logo]()
$328
This Southwest deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/510:05 am -
1 stop5h 15m
Sun 12/65:00 am -
2 stops6h 25m
Deal found 10/8![Southwest logo]()
$160
This Kiwi.com deal was found by Cheapflights users on 10/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/98:44 am -
1 stop10h 46m
Mon 11/168:35 pm -
2 stops26h 19m
Deal found 10/6![Frontier logo]()
$178
This KAYAK deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/212:58 pm -
1 stop5h 12m
Fri 11/66:30 am -
1 stop5h 38m
Deal found 10/8![American Airlines logo]()
$397
This Southwest deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/216:00 am -
Nonstop1h 25m
Tue 12/2211:55 am -
Nonstop1h 20m
Deal found 10/9![Southwest logo]()
$177
This United Airlines deal was found by Cheapflights users on 10/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/46:50 pm -
Nonstop1h 25m
Sun 11/86:00 am -
Nonstop1h 30m
Deal found 10/5![United Airlines logo]()
$229
This Kiwi.com deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/62:31 pm -
1 stop9h 20m
Fri 11/135:06 pm -
1 stop29h 32m
Deal found 10/9![Frontier logo]()
$204
This Southwest deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/152:20 pm -
1 stop6h 00m
Tue 1/196:10 am -
1 stop5h 40m
Deal found 10/8![Southwest logo]()
$187
This United Airlines deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/139:20 pm -
Nonstop1h 28m
Sat 11/146:00 am -
Nonstop1h 30m
Deal found 10/8![United Airlines logo]()
$229
This Kiwi.com deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/56:15 am -
1 stop17h 36m
Mon 11/912:01 pm -
1 stop10h 27m
Deal found 10/9![Frontier logo]()
$208
This Delta deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/54:49 pm -
1 stop5h 22m
Sun 11/86:00 am -
1 stop4h 41m
Deal found 10/8![Delta logo]()
$297
This United Airlines deal was found by Cheapflights users on 10/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:50 pm -
Nonstop1h 25m
Wed 10/286:00 am -
Nonstop1h 30m
Deal found 10/6![United Airlines logo]()
$249
This Southwest deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/23:05 pm -
2 stops6h 00m
Fri 12/412:50 pm -
2 stops5h 45m
Deal found 10/9![Southwest logo]()
$207
This Delta deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/137:00 am -
1 stop5h 30m
Sat 1/236:00 am -
1 stop5h 54m
Deal found 10/9![Delta logo]()
$297
This Kiwi.com deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/282:03 pm -
1 stop9h 48m
Sun 11/111:52 am -
1 stop12h 31m
Deal found 10/8![Frontier logo]()
$225
This Alaska Airlines deal was found by Cheapflights users on 10/4. Clicking the “Pick Dates” 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 10/233:32 pm -
Nonstop1h 33m
Sat 10/245:45 pm -
Nonstop1h 40m
Deal found 10/4![Alaska Airlines logo]()
$337
This Southwest deal was found by Cheapflights users on 10/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/96:00 am -
Nonstop1h 25m
Thu 11/121:00 pm -
Nonstop1h 30m
Deal found 10/6![Southwest logo]()
$216
This Southwest deal was found by Cheapflights users on 10/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/77:00 am -
Nonstop1h 25m
Mon 11/98:45 pm -
1 stop3h 30m
Deal found 10/7![Southwest logo]()
$220
This Delta deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/34:50 pm -
1 stop7h 07m
Sun 12/66:00 am -
1 stop4h 42m
Deal found 10/8![Delta logo]()
$327
This Alaska Airlines deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/143:07 pm -
1 stop20h 11m
Wed 11/186:00 am -
1 stop8h 27m
Deal found 10/8![Alaska Airlines logo]()
$362
This Kiwi.com deal was found by Cheapflights users on 10/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/116:40 pm -
1 stop4h 43m
Sun 1/1012:15 pm -
1 stop19h 24m
Deal found 10/5![Frontier logo]()
$255
This United Airlines deal was found by Cheapflights users on 10/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:20 am -
1 stop6h 09m
Mon 11/161:35 pm -
1 stop6h 00m
Deal found 10/6![United Airlines logo]()
$311
This Southwest deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/273:50 pm -
1 stop6h 15m
Fri 10/306:55 pm -
1 stop5h 45m
Deal found 10/9![Southwest logo]()
$225
This Kiwi.com deal was found by Cheapflights users on 10/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/710:05 am -
1 stop6h 16m
Mon 11/912:01 pm -
1 stop10h 27m
Deal found 10/6![Frontier logo]()
$258
Last-minute flights from California to OntarioDiscover last-minute flight deals from California to Ontario. Data last updated October 9, 2026 and is based on user searches.
Discover last-minute flight deals from California to Ontario. Data last updated October 9, 2026 and is based on user searches.
This Cheapflightsfares deal was found by Cheapflights users on 10/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/266:02 pm -
Nonstop1h 38m
Thu 10/2912:01 pm -
Nonstop1h 35m
Deal found 10/7![Frontier logo]()
$84
This Cheapflightsfares deal was found by Cheapflights users on 10/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/296:02 pm -
Nonstop1h 26m
Mon 11/212:01 pm -
Nonstop1h 35m
Deal found 10/7![Frontier logo]()
$82
This Kiwi.com deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/26:04 pm -
Nonstop1h 26m
Thu 11/512:01 pm -
Nonstop1h 35m
Deal found 10/8![Frontier logo]()
$88
This Super.com deal was found by Cheapflights users on 10/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/56:04 pm -
Nonstop1h 26m
Thu 11/1212:01 pm -
Nonstop1h 35m
Deal found 10/7![Frontier logo]()
$76
This Booking.com deal was found by Cheapflights users on 10/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/56:04 pm -
Nonstop1h 26m
Mon 11/912:01 pm -
Nonstop1h 35m
Deal found 10/6![Frontier logo]()
$77
This Cheapflightsfares deal was found by Cheapflights users on 10/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/66:04 pm -
Nonstop1h 26m
Mon 11/912:01 pm -
Nonstop1h 35m
Deal found 10/7![Frontier logo]()
$74
This Super.com deal was found by Cheapflights users on 10/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:04 pm -
Nonstop1h 26m
Fri 11/1312:01 pm -
Nonstop1h 35m
Deal found 10/6![Frontier logo]()
$85
This FlightHub deal was found by Cheapflights users on 10/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/136:04 pm -
Nonstop1h 26m
Mon 11/1612:01 pm -
Nonstop1h 35m
Deal found 10/5![Frontier logo]()
$80
This Frontier deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/166:04 pm -
Nonstop1h 26m
Fri 11/208:31 pm -
Nonstop1h 33m
Deal found 10/8![Frontier logo]()
$75
This Southwest deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/182:05 pm -
1 stop6h 35m
Mon 11/2310:35 am -
Nonstop1h 15m
Deal found 10/9![Southwest logo]()
$127
This Super.com deal was found by Cheapflights users on 10/7. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2510:59 pm -
Nonstop1h 25m
Wed 12/27:26 pm -
Nonstop1h 34m
Deal found 10/7![Frontier logo]()
$79
This Kiwi.com deal was found by Cheapflights users on 10/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/258:36 am -
Nonstop1h 24m
Wed 11/253:55 pm -
Nonstop1h 36m
Deal found 10/6![Frontier logo]()
$113
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 October 9, 2026.
Search for one-way flight options from California to Ontario. Find affordable one-way fares based on user searches. Data last updated October 9, 2026.
This Trip.com deal was found by Cheapflights users on 10/4. Clicking the “Pick Dates” 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 12/257:41 am -
Nonstop1h 29m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/4![Frontier logo]()
$42
This Super.com deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/186:02 pm -
Nonstop1h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/8![Frontier logo]()
$43
This Booking.com deal was found by Cheapflights users on 10/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/156:02 pm -
Nonstop1h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/5![Frontier logo]()
$44
This Travelocity deal was found by Cheapflights users on 10/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/248:35 pm -
Nonstop1h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/9![Frontier logo]()
$44
This Mytrip deal was found by Cheapflights users on 10/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:04 pm -
Nonstop1h 26m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/5![Frontier logo]()
$45
This FlightHub deal was found by Cheapflights users on 10/4. Clicking the “Pick Dates” 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.
Fri 10/166:02 pm -
Nonstop1h 38m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/4![Frontier logo]()
$46
This Super.com deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2110:59 pm -
Nonstop1h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/8![Frontier logo]()
$50
This Super.com deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/258:36 am -
Nonstop1h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/8![Frontier logo]()
$50
This Kiwi.com deal was found by Cheapflights users on 10/6. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/66:04 pm -
Nonstop1h 26m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/6![Frontier logo]()
$53
This Super.com deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/26:04 pm -
Nonstop1h 26m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/8![Frontier logo]()
$54
This Frontier deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/218:42 pm -
Nonstop1h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/8![Frontier logo]()
$54
This Frontier deal was found by Cheapflights users on 10/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/268:35 pm -
Nonstop1h 17m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/8![Frontier logo]()
$55
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 October 9, 2026.
Round-trip from | $74 (Cheapflightsfares) |
|---|---|
One-way from | $42 (Trip.com) |
Good round-trip deal | $134 or less |
Good one-way deal | $84 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 October 9, 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
Quickest round-trip
San JoseOntario
SJC San Jose - ONT Ontario
SJCONT
San Jose
Wed 12/9
4:35 pm-5:50 pm
Nonstop1h 15m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$59
San FranciscoOntario
SFO San Francisco - ONT Ontario
SFOONT
San Francisco
Sat 12/5
5:00 am-12:50 pm
2 stops7h 50m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$71
OaklandOntario
OAK Oakland - ONT Ontario
OAKONT
Oakland
Tue 1/12
10:30 am-5:55 pm
1 stop7h 25m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$89
OaklandOntario
OAK Oakland - ONT Ontario
OAKONT
Oakland
Fri 11/6
7:00 am-8:20 am
Nonstop1h 20m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$89
San FranciscoOntario
SFO San Francisco - ONT Ontario
SFOONT
San Francisco
Sun 11/22
5:30 pm-11:40 pm
1 stop6h 10m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$96
San FranciscoOntario
SFO San Francisco - ONT Ontario
SFOONT
San Francisco
Thu 11/12
6:50 pm-8:15 pm
Nonstop1h 25m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$99
San FranciscoOntario
SFO San Francisco - ONT Ontario
SFOONT
San Francisco
Fri 1/8
4:10 pm-5:35 pm
Nonstop1h 25m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$104
OaklandOntario
OAK Oakland - ONT Ontario
OAKONT
Oakland
Sat 1/9
11:15 am-5:45 pm
2 stops6h 30m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$104
SacramentoOntario
SMF Sacramento Intl - ONT Ontario
SMFONT
Sacramento Intl
Thu 11/5
11:00 am-12:25 pm
Nonstop1h 25m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$108
Santa RosaOntario
STS Santa Rosa Sonoma County - ONT Ontario
STSONT
Santa Rosa Sonoma County
Sat 10/31
3:32 pm-5:05 pm
Nonstop1h 33m
Ontario
Wed 12/31
12:00 am-12:00 am
Nonstop0h 00m
$109
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
LAX-ONT
SFO-ONT
STS-ONT
OAK-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
LAX-ONT
SFO-ONT
STS-ONT
What is the cheapest month to book a flight from California to Ontario?
Currently, October is the cheapest month in which you can book a flight from California to Ontario (average of $219). Flying from California to Ontario in February is currently the most expensive (average of $340). 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 October 9, 2026.
It’s typically best to fly out from California to Ontario in the evening. Doing so could potentially save you 20% 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 October 3, 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. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Ontario
Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated October 9, 2026.
See what other customers who have flown with Alaska Airlines,Southwest, 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.
Food
7.0
Entertainment
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Food
7.0
Entertainment
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Food
7.0
Entertainment
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Food
7.0
Entertainment
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Food
7.0
Entertainment
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
Food
7.0
Entertainment
7.0
Crew
8.5
Overall
7.9
Boarding
8.1
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,Jan 2026
STS - LAX
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
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Ontario flight routes
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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 October 9, 2026.
California and Ontario flights
Browse other California and Ontario flight options. Last updated on October 9, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
California to Ontario flights
Consider these flights traveling from California to Ontario.
Top 5 airlines flying from California to Ontario
Discover the top 5 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 October 9, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$39 | Average$184 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$98 | Average$227 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$117 | Average$266 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$117 | Average$294 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$142 | Average$302 | FlexibilityNo cancel fee | On-time62% |