$64+ Cheap flights from Ontario (ONT) to San Francisco Bay Area
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 8/10. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SFO
Jun 20 — Jun 271
Round-trip
1 adult, Economy
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Cheapest flights from Ontario to San Francisco Bay AreaExplore the most affordable flight options available from Ontario to San Francisco Bay Area. Find the lowest fares from popular airlines and budget airlines, with prices last updated on Mai 21, 2026.
Explore the most affordable flight options available from Ontario to San Francisco Bay Area. Find the lowest fares from popular airlines and budget airlines, with prices last updated on Mai 21, 2026.
This Kiwi.com deal was found by Cheapflights users on 5/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 7/278:58 am
ONT
- SFO
Nonstop1h 32m
Frontier
Di 7/2811:15 am
SFO
- ONT
Nonstop1h 38m
Frontier
Deal found 5/21![Frontier logo]()
$105
This Super.com deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 6/98:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
So 6/219:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 5/17![Frontier logo]()
$107
This Super.com deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 6/118:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Mo 6/159:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 5/19![Frontier logo]()
$108
This Frontier deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 7/218:39 pm
ONT
- SFO
Nonstop1h 30m
Frontier
Sa 8/19:28 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 5/19![Frontier logo]()
$109
This Frontier deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 6/298:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Mi 7/2911:10 am
SFO
- ONT
Nonstop1h 33m
Frontier
Deal found 5/17![Frontier logo]()
$110
This Kiwi.com deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” 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.
So 7/198:39 pm
ONT
- SFO
Nonstop1h 30m
Frontier
Di 7/2111:10 am
SFO
- ONT
Nonstop1h 33m
Frontier
Deal found 5/16![Frontier logo]()
$111
This Super.com deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 6/88:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Mi 6/1011:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 5/19![Frontier logo]()
$112
This Frontier deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” 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.
So 6/78:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Mo 6/299:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 5/16![Frontier logo]()
$113
This Frontier deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 7/48:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Sa 8/19:28 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 5/17![Frontier logo]()
$115
This Frontier deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” 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.
Di 6/168:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Mi 7/111:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 5/16![Frontier logo]()
$117
This CheapOair deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fr 7/248:39 pm
ONT
- SFO
Nonstop1h 30m
Frontier
Mo 7/279:28 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 5/18![Frontier logo]()
$118
This Frontier deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 6/188:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Mo 6/229:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 5/20![Frontier logo]()
$120
Best flights from Ontario to San Francisco Bay AreaDiscover carefully curated flight deals from Ontario to San Francisco Bay Area that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated Mai 21, 2026.
Discover carefully curated flight deals from Ontario to San Francisco Bay Area that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated Mai 21, 2026.
This Southwest deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 10/1912:45 pm
ONT
- SJC
1 stop7h 05m
Southwest
Di 10/208:20 am
SJC
- ONT
2 stops8h 00m
Southwest
Deal found 5/17![Southwest logo]()
$182
This United Airlines deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 6/236:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Di 6/2310:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 5/20![United Airlines logo]()
$202
This Alaska Airlines deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” 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.
Do 6/256:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
So 6/284:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/16![Alaska Airlines logo]()
$227
This Alaska Airlines deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fr 8/146:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
So 8/164:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/20![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 5/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 7/76:35 pm
ONT
- SFO
1 stop4h 40m
Southwest
Mo 7/133:45 pm
SFO
- ONT
1 stop4h 25m
Southwest
Deal found 5/21![Southwest logo]()
$238
This United Airlines deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 9/216:00 am
ONT
- SFO
Nonstop1h 27m
United Airlines
Mo 9/219:25 pm
SFO
- ONT
Nonstop1h 34m
United Airlines
Deal found 5/19![United Airlines logo]()
$247
This Alaska Airlines deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 10/105:48 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Mi 10/143:40 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/18![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fr 7/105:30 am
ONT
- SFO
2 stops7h 30m
Southwest
Di 7/146:00 am
SFO
- ONT
1 stop5h 30m
Southwest
Deal found 5/17![Southwest logo]()
$243
This Alaska Airlines deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fr 7/176:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Mo 7/204:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/20![Alaska Airlines logo]()
$227
This Southwest deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” 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.
Mo 6/228:35 am
ONT
- SFO
2 stops8h 30m
Southwest
Mi 6/246:00 am
SFO
- ONT
1 stop5h 30m
Southwest
Deal found 5/16![Southwest logo]()
$247
This Southwest deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 10/201:00 pm
ONT
- OAK
2 stops6h 35m
Southwest
Do 10/228:15 am
OAK
- ONT
1 stop5h 55m
Southwest
Deal found 5/17![Southwest logo]()
$252
This Southwest deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fr 11/64:00 pm
ONT
- SJC
2 stops6h 20m
Southwest
Mo 11/96:30 am
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 5/18![Southwest logo]()
$253
This Alaska Airlines deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 6/156:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Do 6/184:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/20![Alaska Airlines logo]()
$287
This Southwest deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 7/98:45 pm
ONT
- SFO
1 stop4h 05m
Southwest
Sa 7/115:00 am
SFO
- ONT
1 stop3h 40m
Southwest
Deal found 5/20![Southwest logo]()
$257
This Alaska Airlines deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” 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.
So 7/126:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Mi 7/154:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/16![Alaska Airlines logo]()
$287
This Southwest deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fr 7/104:00 pm
ONT
- OAK
Nonstop1h 15m
Southwest
Di 7/1411:05 am
OAK
- ONT
Nonstop1h 20m
Southwest
Deal found 5/17![Southwest logo]()
$258
This United Airlines deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” 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.
Sa 6/65:00 am
ONT
- SJC
1 stop8h 24m
United Airlines
Mo 6/82:32 pm
SJC
- ONT
1 stop6h 14m
United Airlines
Deal found 5/16![United Airlines logo]()
$424
This Southwest deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fr 8/215:40 am
ONT
- SFO
2 stops7h 30m
Southwest
Mo 8/2411:05 am
SFO
- ONT
1 stop4h 10m
Southwest
Deal found 5/17![Southwest logo]()
$263
This Alaska Airlines deal was found by Cheapflights users on 5/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 9/244:27 pm
ONT
- STS
Nonstop1h 40m
Alaska Airlines
Di 9/296:53 pm
STS
- ONT
2 stops19h 23m
Alaska Airlines
Deal found 5/21![Alaska Airlines logo]()
$340
This United Airlines deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 6/41:18 pm
ONT
- SJC
1 stop7h 51m
United Airlines
Mo 6/82:32 pm
SJC
- ONT
1 stop6h 14m
United Airlines
Deal found 5/19![United Airlines logo]()
$459
This Southwest deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mi 7/87:40 pm
ONT
- OAK
Nonstop1h 20m
Southwest
Mo 7/135:30 pm
OAK
- ONT
2 stops6h 35m
Southwest
Deal found 5/18![Southwest logo]()
$273
This Alaska Airlines deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 6/43:35 pm
ONT
- STS
Nonstop1h 29m
Alaska Airlines
Fr 6/55:44 pm
STS
- ONT
Nonstop1h 24m
Alaska Airlines
Deal found 5/20![Alaska Airlines logo]()
$347
This Southwest deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” 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.
Mi 6/174:35 pm
ONT
- SJC
2 stops6h 25m
Southwest
So 6/289:05 am
SJC
- ONT
1 stop5h 30m
Southwest
Deal found 5/16![Southwest logo]()
$293
This Alaska Airlines deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 7/216:43 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
So 7/264:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/19![Alaska Airlines logo]()
$377
This Southwest deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 6/98:30 am
ONT
- OAK
1 stop4h 10m
Southwest
Di 6/94:40 pm
OAK
- ONT
2 stops6h 20m
Southwest
Deal found 5/19![Southwest logo]()
$310
This Alaska Airlines deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 7/305:32 pm
ONT
- STS
1 stop5h 58m
Alaska Airlines
So 8/24:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 5/19![Alaska Airlines logo]()
$415
This Southwest deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” 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.
Mo 6/227:30 pm
ONT
- OAK
Nonstop1h 20m
Southwest
Do 6/254:30 pm
OAK
- ONT
2 stops5h 40m
Southwest
Deal found 5/16![Southwest logo]()
$314
This Southwest deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” 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.
Di 6/98:30 am
ONT
- SFO
2 stops8h 10m
Southwest
Mi 6/1012:10 pm
SFO
- ONT
2 stops7h 50m
Southwest
Deal found 5/16![Southwest logo]()
$317
This Southwest deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 6/255:15 pm
ONT
- SFO
2 stops7h 15m
Southwest
So 6/286:40 pm
SFO
- ONT
1 stop5h 25m
Southwest
Deal found 5/18![Southwest logo]()
$322
This Alaska Airlines deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” 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.
Sa 6/207:00 am
ONT
- SJC
1 stop16h 21m
Alaska Airlines
Di 7/712:03 pm
SJC
- ONT
1 stop11h 48m
Alaska Airlines
Deal found 5/16![Alaska Airlines logo]()
$503
Last-minute flights from Ontario to San Francisco Bay AreaDiscover last-minute flight deals from Ontario to San Francisco Bay Area. Data last updated Mai 21, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to San Francisco Bay Area. Data last updated Mai 21, 2026 and is based on user searches.
This Frontier deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” 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.
So 6/78:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Mo 6/299:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 5/16![Frontier logo]()
$113
This Super.com deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 6/88:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Mi 6/1011:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 5/19![Frontier logo]()
$112
This Super.com deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 6/98:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
So 6/219:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 5/17![Frontier logo]()
$107
This Super.com deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 6/98:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Fr 6/129:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 5/18![Frontier logo]()
$122
This Southwest deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mi 6/106:10 am
ONT
- SJC
Nonstop1h 15m
Southwest
Mi 6/176:30 am
SJC
- ONT
Nonstop1h 20m
Southwest
Deal found 5/19![Southwest logo]()
$137
This Super.com deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 6/118:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Mo 6/159:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 5/19![Frontier logo]()
$108
This Frontier deal was found by Cheapflights users on 5/16. Clicking the “Pick Dates” 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.
Di 6/168:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Mi 7/111:13 am
SFO
- ONT
Nonstop1h 35m
Frontier
Deal found 5/16![Frontier logo]()
$117
This Flightnetwork deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Flightnetwork is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 6/168:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Di 6/2310:58 pm
SFO
- ONT
1 stop16h 10m
Frontier
Deal found 5/17![Frontier logo]()
$123
This Super.com deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 6/188:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Mo 6/229:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 5/18![Frontier logo]()
$115
This Super.com deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 6/258:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
So 6/289:41 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 5/18![Frontier logo]()
$118
This Frontier deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 6/298:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Mi 7/2911:10 am
SFO
- ONT
Nonstop1h 33m
Frontier
Deal found 5/17![Frontier logo]()
$110
This Frontier deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 6/298:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
So 8/29:28 am
SFO
- ONT
Nonstop1h 29m
Frontier
Deal found 5/17![Frontier logo]()
$124
One-way flights from Ontario to San Francisco Bay AreaSearch for one-way flight options from Ontario to San Francisco Bay Area. Find affordable one-way fares based on user searches. Data last updated Mai 21, 2026.
Search for one-way flight options from Ontario to San Francisco Bay Area. Find affordable one-way fares based on user searches. Data last updated Mai 21, 2026.
This Super.com deal was found by Cheapflights users on 5/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 8/108:58 am
ONT
- SFO
Nonstop1h 27m
Frontier
Deal found 5/21![Frontier logo]()
$64
This Super.com deal was found by Cheapflights users on 5/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Do 9/102:26 pm
ONT
- SFO
Nonstop1h 30m
Frontier
Deal found 5/20![Frontier logo]()
$66
This Frontier deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mo 8/178:39 pm
ONT
- SFO
Nonstop1h 30m
Frontier
Deal found 5/19![Frontier logo]()
$67
This Kiwi.com deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fr 7/108:39 pm
ONT
- SFO
Nonstop1h 30m
Frontier
Deal found 5/17![Frontier logo]()
$68
This Southwest deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mi 6/176:10 am
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 5/18![Southwest logo]()
$69
This Frontier deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
So 6/78:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Deal found 5/18![Frontier logo]()
$69
This Kiwi.com deal was found by Cheapflights users on 5/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 6/91:33 pm
ONT
- SFO
1 stop24h 43m
Frontier
Deal found 5/17![Frontier logo]()
$70
This Frontier deal was found by Cheapflights users on 5/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sa 6/138:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 5/19![Frontier logo]()
$73
This Super.com deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fr 8/148:39 pm
ONT
- SFO
Nonstop1h 30m
Frontier
Deal found 5/18![Frontier logo]()
$76
This Super.com deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
So 8/28:39 pm
ONT
- SFO
Nonstop1h 30m
Frontier
Deal found 5/18![Frontier logo]()
$77
This Kiwi.com deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fr 6/128:36 pm
ONT
- SFO
Nonstop1h 37m
Frontier
Deal found 5/18![Frontier logo]()
$78
This Southwest deal was found by Cheapflights users on 5/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Di 6/166:35 pm
ONT
- SJC
1 stop3h 20m
Southwest
Deal found 5/18![Southwest logo]()
$79
Find flight deals from Ontario to San Francisco Bay Area
Keep the following information in mind while searching for Ontario to San Francisco Bay Area flight deals. Data was last updated Mai 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $105 (Kiwi.com) |
One-way from | $66 (Super.com) |
Popular in | February |
Cheapest in | October |
Average price | $214 |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to San Francisco Bay Area 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 Mai 21, 2026.
Use the filters below to find and compare flights from Ontario to San Francisco Bay Area that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Mo 10/19
12:45 pm-7:50 pm
1 stop7h 05m
San Jose
Di 10/20
8:20 am-4:20 pm
2 stops8h 00m
$182
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Di 6/23
6:00 am-7:25 am
Nonstop1h 25m
San Francisco
Di 6/23
10:40 am-12:12 pm
Nonstop1h 32m
$202
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Do 6/25
6:43 pm-8:14 pm
Nonstop1h 31m
Santa Rosa Sonoma County
So 6/28
4:35 pm-6:03 pm
Nonstop1h 28m
$227
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Fr 8/14
6:43 pm-8:14 pm
Nonstop1h 31m
Santa Rosa Sonoma County
So 8/16
4:35 pm-6:03 pm
Nonstop1h 28m
$227
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Sa 10/10
5:48 pm-7:19 pm
Nonstop1h 31m
Santa Rosa Sonoma County
Mi 10/14
3:40 pm-5:08 pm
Nonstop1h 28m
$227
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Fr 7/17
6:43 pm-8:14 pm
Nonstop1h 31m
Santa Rosa Sonoma County
Mo 7/20
4:35 pm-6:03 pm
Nonstop1h 28m
$227
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Di 7/7
6:35 pm-11:15 pm
1 stop4h 40m
San Francisco
Mo 7/13
3:45 pm-8:10 pm
1 stop4h 25m
$238
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Fr 7/10
5:30 am-1:00 pm
2 stops7h 30m
San Francisco
Di 7/14
6:00 am-11:30 am
1 stop5h 30m
$243
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Mo 9/21
6:00 am-7:27 am
Nonstop1h 27m
San Francisco
Mo 9/21
9:25 pm-10:59 pm
Nonstop1h 34m
$247
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Mo 6/22
8:35 am-5:05 pm
2 stops8h 30m
San Francisco
Mi 6/24
6:00 am-11:30 am
1 stop5h 30m
$247
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Ontario to San Francisco Bay Area
Have a flexible travel schedule? Discover the best time to fly to San Francisco Bay Area from Ontario with our price prediction graph.
ONT-SFO
ONT-SJC
ONT-STS
ONT-OAK
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 San Francisco Bay Area
ONT-zzXIH
ONT-SFO
ONT-SJC
ONT-STS
ONT-OAK
What is the cheapest month to book a flight from Ontario to San Francisco Bay Area?
Currently, April is the cheapest month in which you can book a flight from Ontario to San Francisco Bay Area (average of $28). Flying from Ontario to San Francisco Bay Area in October is currently the most expensive (average of $729). 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 XIH?
Find hourly flight availability from Ontario to San Francisco Bay Area. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated Mai 21, 2026.
One of the essential ways to save on airfare from Ontario to San Francisco Bay Area is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 31% on airfare.
How far ahead should I book a flight from Ontario to San Francisco Bay Area?
The best time to book flights from Ontario to San Francisco Bay Area is 86 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
What is the cheapest day to fly from Ontario to San Francisco Bay Area?
Use this chart to determine the cheapest time to fly round-trip from Ontario to San Francisco Bay Area. Price data was last updated on May 16, 2026.
Travelers seeking maximum savings on their Ontario to San Francisco Bay Area flight should consider departing on Friday evenings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing San Francisco Bay Area
Get insights into the airlines that provide service to San Francisco Bay Area. 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 San Francisco Bay Area. Reviews last updated Mai 21, 2026.
Get a feel of what it's like to fly with Alaska Airlines,Southwest, andUnited Airlines from Ontario to San Francisco Bay Area by reading reviews from past customers. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.5
Food
7.0
Boarding
8.1
Entertainment
7.0
Overall
7.9
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Food
7.0
Boarding
8.1
Entertainment
7.0
Overall
7.9
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Food
7.0
Boarding
8.1
Entertainment
7.0
Overall
7.9
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Food
7.0
Boarding
8.1
Entertainment
7.0
Overall
7.9
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Food
7.0
Boarding
8.1
Entertainment
7.0
Overall
7.9
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Crew
8.5
Food
7.0
Boarding
8.1
Entertainment
7.0
Overall
7.9
Comfort
7.8
Reviews
1 / 20
10.0
Excellentrobert,Feb 2026
LAS - SAN
Related info for your journey
Find useful and relevant information for your journey from Ontario to San Francisco Bay Area. 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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Alternative routes for Ontario to San Francisco Bay Area
See prices for flight routes from nearby airports that may be better suited for you.
Complete your trip
Complete your trip to San Francisco Bay Area by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to San Francisco Bay Area by cabin class
Find flights from Ontario to San Francisco Bay Area, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and San Francisco Bay Area flights
Browse other Ontario and San Francisco Bay Area flight options. Last updated on Mai 21, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to San Francisco Bay Area flights
Consider these flights traveling from Ontario to San Francisco Bay Area.
Top 6 airlines flying from Ontario to San Francisco Bay Area
Discover the top 6 airlines that operate flights from Ontario to San Francisco Bay Area. 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 Mai 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$123 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$77 | Average$175 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$78 | Average$177 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$123 | Average$310 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$153 | Average$169 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$236 | Average$416 | FlexibilityNo cancel fee | On-time71% |