$59+ Cheap flights from San Francisco Bay Area to Ontario (ONT)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/28. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — ONT
May 2 — May 91
Round-trip
1 adult, Economy
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Find cheap flights from San Francisco Bay Area 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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Cheapest flights from San Francisco Bay Area to OntarioExplore the most affordable flight options available from San Francisco Bay Area to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 2, 2026.
Explore the most affordable flight options available from San Francisco Bay Area to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 2, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/511:26 am
SFO
- ONT
Nonstop1h 39m
Frontier
Sat 5/98:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Deal found 3/31![Frontier logo]()
$101
This Frontier deal was found by Cheapflights users on 3/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/2611:15 am
SFO
- ONT
Nonstop1h 39m
Frontier
Thu 5/288:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Deal found 3/31![Frontier logo]()
$102
This Frontier deal was found by Cheapflights users on 3/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/182:47 pm
SFO
- ONT
1 stop4h 02m
Frontier
Sun 4/199:10 am
ONT
- SFO
Nonstop1h 40m
Frontier
Deal found 3/28![Frontier logo]()
$103
This Frontier deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/239:18 am
SFO
- ONT
Nonstop1h 34m
Frontier
Sun 4/269:10 am
ONT
- SFO
Nonstop1h 40m
Frontier
Deal found 4/1![Frontier logo]()
$107
This Frontier deal was found by Cheapflights users on 3/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/511:26 am
SFO
- ONT
Nonstop1h 39m
Frontier
Fri 5/88:30 am
ONT
- SFO
1 stop14h 34m
Frontier
Deal found 3/31![Frontier logo]()
$108
This Super.com deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” 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 5/36:00 am
SFO
- ONT
1 stop25h 31m
Frontier
Thu 5/78:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Deal found 4/1![Frontier logo]()
$109
This CheapTickets deal was found by Cheapflights users on 3/31. 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 CheapTickets is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/210:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Sat 5/912:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Deal found 3/31![Alaska Airlines logo]()
$110
This Frontier deal was found by Cheapflights users on 3/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/35:45 pm
SFO
- ONT
Nonstop1h 39m
Frontier
Wed 5/68:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Deal found 3/31![Frontier logo]()
$112
This CheapOair deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/66:00 am
SFO
- ONT
1 stop17h 49m
Frontier
Thu 5/78:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Deal found 4/1![Frontier logo]()
$114
This Frontier deal was found by Cheapflights users on 3/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/222:47 pm
SFO
- ONT
1 stop4h 02m
Frontier
Thu 4/239:10 am
ONT
- SFO
Nonstop1h 40m
Frontier
Deal found 3/28![Frontier logo]()
$115
This Expedia deal was found by Cheapflights users on 3/31. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/2611:15 am
SFO
- ONT
Nonstop1h 39m
Frontier
Sat 5/308:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Deal found 3/31![Frontier logo]()
$117
This Southwest deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” 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 5/207:15 am
SJC
- ONT
Nonstop1h 15m
Southwest
Tue 5/2612:30 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 4/1![Southwest logo]()
$117
Best flights from San Francisco Bay Area to OntarioDiscover carefully curated flight deals from San Francisco Bay Area to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 2, 2026.
Discover carefully curated flight deals from San Francisco Bay Area to Ontario that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 2, 2026.
This Alaska Airlines deal was found by Cheapflights users on 3/31. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/135:44 pm
STS
- ONT
Nonstop1h 24m
Alaska Airlines
Tue 5/193:35 pm
ONT
- STS
Nonstop1h 29m
Alaska Airlines
Deal found 3/31![Alaska Airlines logo]()
$117
This Southwest deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” 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 5/2012:30 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Tue 5/2610:55 am
ONT
- SJC
2 stops6h 55m
Southwest
Deal found 4/1![Southwest logo]()
$132
This United Airlines deal was found by Cheapflights users on 3/29. 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.
Sat 5/28:10 am
SFO
- ONT
Nonstop1h 31m
United Airlines
Mon 5/410:37 am
ONT
- SFO
Nonstop1h 30m
United Airlines
Deal found 3/29![United Airlines logo]()
$246
This Alaska Airlines deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” 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 5/135:44 pm
STS
- ONT
Nonstop1h 24m
Alaska Airlines
Sat 5/163:35 pm
ONT
- STS
Nonstop1h 29m
Alaska Airlines
Deal found 4/1![Alaska Airlines logo]()
$137
This Southwest deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” 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 4/2910:30 am
SFO
- ONT
1 stop4h 35m
Southwest
Wed 5/612:40 pm
ONT
- SFO
1 stop6h 25m
Southwest
Deal found 4/1![Southwest logo]()
$151
This Alaska Airlines deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” 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 5/510:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Wed 5/612:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Deal found 4/1![Alaska Airlines logo]()
$157
This Southwest deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” 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 5/62:55 pm
SJC
- ONT
2 stops6h 50m
Southwest
Mon 5/186:10 am
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 4/1![Southwest logo]()
$162
This Southwest deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/14:40 pm
STS
- ONT
2 stops6h 25m
Southwest
Tue 5/122:25 pm
ONT
- STS
2 stops7h 45m
Southwest
Deal found 4/1![Southwest logo]()
$194
This United Airlines deal was found by Cheapflights users on 3/28. 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.
Sat 4/2510:50 am
SFO
- ONT
Nonstop1h 30m
United Airlines
Sat 4/256:49 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Deal found 3/28![United Airlines logo]()
$247
This Southwest deal was found by Cheapflights users on 3/29. 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.
Thu 5/75:05 am
SFO
- ONT
1 stop6h 15m
Southwest
Mon 5/115:05 pm
ONT
- SFO
1 stop4h 05m
Southwest
Deal found 3/29![Southwest logo]()
$197
This Alaska Airlines deal was found by Cheapflights users on 3/30. 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.
Mon 8/312:09 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Mon 9/74:18 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Deal found 3/30![Alaska Airlines logo]()
$217
This United Airlines deal was found by Cheapflights users on 3/28. 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 4/2110:50 am
SFO
- ONT
Nonstop1h 30m
United Airlines
Wed 4/2211:05 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Deal found 3/28![United Airlines logo]()
$247
This Alaska Airlines deal was found by Cheapflights users on 3/30. 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.
Wed 6/244:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Sat 6/276:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Deal found 3/30![Alaska Airlines logo]()
$217
This Southwest deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” 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 4/233:00 pm
SFO
- ONT
2 stops5h 40m
Southwest
Mon 4/276:00 pm
ONT
- SFO
1 stop6h 10m
Southwest
Deal found 4/1![Southwest logo]()
$202
This Southwest deal was found by Cheapflights users on 3/29. 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.
Tue 4/282:20 pm
SJC
- ONT
2 stops7h 10m
Southwest
Wed 4/2910:30 am
ONT
- SJC
2 stops6h 50m
Southwest
Deal found 3/29![Southwest logo]()
$207
This Alaska Airlines deal was found by Cheapflights users on 3/28. 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.
Fri 4/172:12 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Tue 4/214:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Deal found 3/28![Alaska Airlines logo]()
$237
This Alaska Airlines deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/2910:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Fri 5/17:59 pm
ONT
- STS
1 stop16h 22m
Alaska Airlines
Deal found 4/1![Alaska Airlines logo]()
$240
This Southwest deal was found by Cheapflights users on 3/29. 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.
Tue 4/218:50 pm
OAK
- ONT
Nonstop1h 20m
Southwest
Sat 4/256:20 am
ONT
- OAK
1 stop8h 30m
Southwest
Deal found 3/29![Southwest logo]()
$231
This Alaska Airlines deal was found by Cheapflights users on 3/28. 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 4/2510:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Sun 4/2612:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Deal found 3/28![Alaska Airlines logo]()
$247
This Southwest deal was found by Cheapflights users on 3/28. 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.
Sat 4/251:10 pm
OAK
- ONT
1 stop8h 10m
Southwest
Sat 5/26:00 am
ONT
- OAK
Nonstop1h 20m
Southwest
Deal found 3/28![Southwest logo]()
$231
This Alaska Airlines deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” 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 5/11:13 pm
STS
- ONT
1 stop10h 46m
Alaska Airlines
Sat 5/912:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Deal found 4/1![Alaska Airlines logo]()
$250
This United Airlines deal was found by Cheapflights users on 3/30. 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.
Wed 7/82:32 pm
SJC
- ONT
1 stop6h 10m
United Airlines
Tue 7/145:00 am
ONT
- SJC
1 stop8h 25m
United Airlines
Deal found 3/30![United Airlines logo]()
$414
This Southwest deal was found by Cheapflights users on 3/29. 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.
Mon 6/13:50 pm
OAK
- ONT
2 stops5h 25m
Southwest
Thu 6/44:00 pm
ONT
- OAK
Nonstop1h 15m
Southwest
Deal found 3/29![Southwest logo]()
$236
This Southwest deal was found by Cheapflights users on 3/29. 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.
Thu 4/235:05 am
SFO
- ONT
1 stop6h 15m
Southwest
Thu 4/303:00 pm
ONT
- SFO
2 stops7h 10m
Southwest
Deal found 3/29![Southwest logo]()
$246
This United Airlines deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” 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 6/192:32 pm
SJC
- ONT
1 stop6h 10m
United Airlines
Sat 6/275:00 am
ONT
- SJC
1 stop8h 24m
United Airlines
Deal found 4/1![United Airlines logo]()
$464
This Southwest deal was found by Cheapflights users on 3/30. 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.
Sat 5/3012:00 pm
STS
- ONT
2 stops7h 20m
Southwest
Mon 6/13:35 pm
ONT
- STS
2 stops7h 05m
Southwest
Deal found 3/30![Southwest logo]()
$247
This Southwest deal was found by Cheapflights users on 3/31. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/303:25 pm
SJC
- ONT
1 stop5h 50m
Southwest
Sun 5/39:20 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 3/31![Southwest logo]()
$248
This Alaska Airlines deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/299:33 am
OAK
- ONT
1 stop14h 15m
Alaska Airlines
Wed 5/67:00 am
ONT
- OAK
1 stop12h 24m
Alaska Airlines
Deal found 4/1![Alaska Airlines logo]()
$343
This Southwest deal was found by Cheapflights users on 3/30. 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.
Fri 5/87:25 am
SFO
- ONT
1 stop9h 00m
Southwest
Mon 5/113:00 pm
ONT
- SFO
2 stops7h 10m
Southwest
Deal found 3/30![Southwest logo]()
$259
This Southwest deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” 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.
Sun 7/196:50 am
OAK
- ONT
Nonstop1h 20m
Southwest
Tue 7/2110:20 am
ONT
- OAK
Nonstop1h 20m
Southwest
Deal found 4/1![Southwest logo]()
$259
Last-minute flights from San Francisco Bay Area to OntarioDiscover last-minute flight deals from San Francisco Bay Area to Ontario. Data last updated April 2, 2026 and is based on user searches.
Discover last-minute flight deals from San Francisco Bay Area to Ontario. Data last updated April 2, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 3/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/182:47 pm
SFO
- ONT
1 stop4h 02m
Frontier
Sun 4/199:10 am
ONT
- SFO
Nonstop1h 40m
Frontier
Deal found 3/28![Frontier logo]()
$103
This Frontier deal was found by Cheapflights users on 3/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/222:47 pm
SFO
- ONT
1 stop4h 02m
Frontier
Thu 4/239:10 am
ONT
- SFO
Nonstop1h 40m
Frontier
Deal found 3/28![Frontier logo]()
$115
This Frontier deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/239:18 am
SFO
- ONT
Nonstop1h 34m
Frontier
Sun 4/269:10 am
ONT
- SFO
Nonstop1h 40m
Frontier
Deal found 4/1![Frontier logo]()
$107
This CheapTickets deal was found by Cheapflights users on 3/31. 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 CheapTickets is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/210:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Sat 5/912:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Deal found 3/31![Alaska Airlines logo]()
$110
This Super.com deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” 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 5/36:00 am
SFO
- ONT
1 stop25h 31m
Frontier
Thu 5/78:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Deal found 4/1![Frontier logo]()
$109
This Frontier deal was found by Cheapflights users on 3/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/35:45 pm
SFO
- ONT
Nonstop1h 39m
Frontier
Wed 5/68:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Deal found 3/31![Frontier logo]()
$112
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/511:26 am
SFO
- ONT
Nonstop1h 39m
Frontier
Sat 5/98:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Deal found 3/31![Frontier logo]()
$101
This Frontier deal was found by Cheapflights users on 3/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/511:26 am
SFO
- ONT
Nonstop1h 39m
Frontier
Fri 5/88:30 am
ONT
- SFO
1 stop14h 34m
Frontier
Deal found 3/31![Frontier logo]()
$108
This CheapOair deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/66:00 am
SFO
- ONT
1 stop17h 49m
Frontier
Thu 5/78:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Deal found 4/1![Frontier logo]()
$114
This Southwest deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” 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 5/207:15 am
SJC
- ONT
Nonstop1h 15m
Southwest
Tue 5/2612:30 pm
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 4/1![Southwest logo]()
$117
This Frontier deal was found by Cheapflights users on 3/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/2611:15 am
SFO
- ONT
Nonstop1h 39m
Frontier
Thu 5/288:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Deal found 3/31![Frontier logo]()
$102
This Frontier deal was found by Cheapflights users on 3/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/2611:15 am
SFO
- ONT
Nonstop1h 39m
Frontier
Sat 6/138:33 pm
ONT
- SFO
Nonstop1h 32m
Frontier
Deal found 3/31![Frontier logo]()
$117
One-way flights from San Francisco Bay Area to OntarioSearch for one-way flight options from San Francisco Bay Area to Ontario. Find affordable one-way fares based on user searches. Data last updated April 2, 2026.
Search for one-way flight options from San Francisco Bay Area to Ontario. Find affordable one-way fares based on user searches. Data last updated April 2, 2026.
This Southwest deal was found by Cheapflights users on 3/31. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2812:30 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 3/31![Southwest logo]()
$59
This Frontier deal was found by Cheapflights users on 3/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/119:31 am
SFO
- ONT
Nonstop1h 27m
Frontier
Deal found 3/31![Frontier logo]()
$64
This Frontier deal was found by Cheapflights users on 3/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/1711:12 am
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 3/31![Frontier logo]()
$65
This Frontier deal was found by Cheapflights users on 4/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/1211:12 am
SFO
- ONT
Nonstop1h 30m
Frontier
Deal found 4/1![Frontier logo]()
$66
This Kiwi.com deal was found by Cheapflights users on 3/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/239:18 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 3/28![Frontier logo]()
$68
This Booking.com deal was found by Cheapflights users on 3/30. 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.
Thu 4/309:18 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 3/30![Frontier logo]()
$69
This Frontier deal was found by Cheapflights users on 3/28. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/222:47 pm
SFO
- ONT
1 stop4h 02m
Frontier
Deal found 3/28![Frontier logo]()
$70
This Super.com deal was found by Cheapflights users on 3/30. 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.
Thu 5/72:12 pm
SJC
- ONT
1 stop5h 20m
Frontier
Deal found 3/30![Frontier logo]()
$70
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/269:18 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 3/31![Frontier logo]()
$73
This Frontier deal was found by Cheapflights users on 3/31. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/199:18 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 3/31![Frontier logo]()
$74
This Super.com deal was found by Cheapflights users on 3/30. 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.
Sun 5/38:22 pm
SJC
- ONT
1 stop11h 42m
Frontier
Deal found 3/30![Frontier logo]()
$75
This CheapOair deal was found by Cheapflights users on 3/29. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 4/268:22 pm
SJC
- ONT
1 stop16h 48m
Frontier
Deal found 3/29![Frontier logo]()
$76
Find flight deals from San Francisco Bay Area to Ontario
Keep the following information in mind while searching for San Francisco Bay Area to Ontario flight deals. Data was last updated April 2, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $101 (Kiwi.com) |
One-way from | $59 (Southwest) |
Popular in | February |
Cheapest in | July |
Average price | $178 |
Cheapflights Fare Finder
Customize your flight search to find flights from San Francisco Bay Area to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 2, 2026.
Use the filters below to find and compare flights from San Francisco Bay Area to Ontario that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Wed 5/13
5:44 pm-7:08 pm
Nonstop1h 24m
Ontario
Tue 5/19
3:35 pm-5:04 pm
Nonstop1h 29m
$117
San JoseOntario
SJC - ONT
SJCONT
San Jose
Wed 5/20
12:30 pm-1:45 pm
Nonstop1h 15m
Ontario
Tue 5/26
10:55 am-5:50 pm
2 stops6h 55m
$132
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Wed 5/13
5:44 pm-7:08 pm
Nonstop1h 24m
Ontario
Sat 5/16
3:35 pm-5:04 pm
Nonstop1h 29m
$137
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Wed 4/29
10:30 am-3:05 pm
1 stop4h 35m
Ontario
Wed 5/6
12:40 pm-7:05 pm
1 stop6h 25m
$151
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Tue 5/5
10:41 am-12:08 pm
Nonstop1h 27m
Ontario
Wed 5/6
12:48 pm-2:20 pm
Nonstop1h 32m
$157
San JoseOntario
SJC - ONT
SJCONT
San Jose
Wed 5/6
2:55 pm-9:45 pm
2 stops6h 50m
Ontario
Mon 5/18
6:10 am-7:25 am
Nonstop1h 15m
$162
Santa RosaOntario
STS - ONT
STSONT
Santa Rosa Sonoma County
Fri 5/1
4:40 pm-11:05 pm
2 stops6h 25m
Ontario
Tue 5/12
2:25 pm-10:10 pm
2 stops7h 45m
$194
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Thu 5/7
5:05 am-11:20 am
1 stop6h 15m
Ontario
Mon 5/11
5:05 pm-9:10 pm
1 stop4h 05m
$197
San FranciscoOntario
SFO - ONT
SFOONT
San Francisco
Thu 4/23
3:00 pm-8:40 pm
2 stops5h 40m
Ontario
Mon 4/27
6:00 pm-12:10 am
1 stop6h 10m
$202
San JoseOntario
SJC - ONT
SJCONT
San Jose
Tue 4/28
2:20 pm-9:30 pm
2 stops7h 10m
Ontario
Wed 4/29
10:30 am-5:20 pm
2 stops6h 50m
$207
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from San Francisco Bay Area to Ontario
Have a flexible travel schedule? Discover the best time to fly to Ontario from San Francisco Bay Area with our price prediction graph.
SFO-ONT
STS-ONT
SJC-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 San Francisco Bay Area to Ontario
zzXIH-ONT
SFO-ONT
STS-ONT
SJC-ONT
OAK-ONT
What is the cheapest month to book a flight from San Francisco Bay Area to Ontario?
Currently, February is the cheapest month in which you can book a flight from San Francisco Bay Area to Ontario (average of $33). Flying from San Francisco Bay Area to Ontario in July is currently the most expensive (average of $57). 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 XIH to ONT?
Find hourly flight availability from San Francisco Bay Area 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 April 2, 2026.
Unlike at noon, when flights are generally more expensive, you can save up to 21% on flights from San Francisco Bay Area to Ontario by exploring options for tickets in the evening.
What is the cheapest day to fly from San Francisco Bay Area to Ontario?
Use this chart to determine the cheapest time to fly round-trip from San Francisco Bay Area to Ontario. Price data was last updated on March 28, 2026.
Travelers seeking maximum savings on their San Francisco Bay Area to Ontario flight should consider departing on Sunday mornings when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from San Francisco Bay Area to Ontario
Explore weekly flight availability from San Francisco Bay Area to Ontario. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated April 2, 2026.
The most flights from zzXIH to ONT are scheduled on a Thursday (12 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (4 on average).
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 April 2, 2026.
Read reviews from past customers who have flown Southwest,Alaska Airlines, andUnited Airlines from San Francisco Bay Area to Ontario. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Crew
8.6
Entertainment
7.5
Boarding
8.1
Food
7.0
Overall
8.0
Comfort
8.0
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Related info for your journey
Find useful and relevant information for your journey from San Francisco Bay Area to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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Complete your trip
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Ontario flight routes
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Alternative routes for San Francisco Bay Area 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 San Francisco Bay Area to Ontario by cabin class
Find flights from San Francisco Bay Area 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 April 2, 2026.
San Francisco Bay Area and Ontario flights
Browse other San Francisco Bay Area and Ontario flight options. Last updated on April 2, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
San Francisco Bay Area to Ontario flights
Consider these flights traveling from San Francisco Bay Area to Ontario.
Top 6 airlines flying from San Francisco Bay Area to Ontario
Discover the top 6 airlines that operate flights from San Francisco Bay Area to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated April 2, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$27 | Average$150 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$66 | Average$204 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$68 | Average$220 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$107 | Average$245 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$115 | Average$268 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$186 | Average$259 | FlexibilityNo cancel fee | On-time71% |