$59+ 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 5/20. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — SFO
May 3 — May 101
Round-trip
1 adult, Economy
We work with more than 300 partners to bring you better travel deals
Find cheap flights from Ontario to San Francisco Bay Area with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Ontario to San Francisco Bay Area
Cheapest
Best
Last-minute
One-way
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 April 3, 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 April 3, 2026.
This Alaska Airlines deal was found by Cheapflights users on 4/3. Clicking the “Pick Dates” 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 4/2912:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Sat 5/210:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Deal found 4/3![Alaska Airlines logo]()
$97
This Kiwi.com deal was found by Cheapflights users on 4/2. Clicking the “Pick Dates” 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 4/2712:59 am
ONT
- SFO
1 stop22h 26m
Frontier
Thu 4/309:18 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 4/2![Frontier logo]()
$116
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.
Sat 5/912:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Tue 5/1210:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Deal found 3/30![Alaska Airlines logo]()
$117
This Southwest deal was found by Cheapflights users on 4/2. Clicking the “Pick Dates” 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 4/285:45 am
ONT
- SJC
Nonstop1h 15m
Southwest
Wed 5/612:30 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 4/2![Southwest logo]()
$117
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/309:10 am
ONT
- SFO
Nonstop1h 40m
Frontier
Sat 5/99:19 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 3/31![Frontier logo]()
$117
This Frontier deal was found by Cheapflights users on 4/3. Clicking the “Pick Dates” 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 5/268:59 am
ONT
- SFO
Nonstop1h 39m
Frontier
Sat 5/3012:52 pm
SFO
- ONT
1 stop10h 57m
Frontier
Deal found 4/3![Frontier logo]()
$118
This Booking.com deal was found by Cheapflights users on 4/3. Clicking the “Pick Dates” 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 5/148:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Sat 5/169:15 am
SFO
- ONT
1 stop5h 54m
Frontier
Deal found 4/3![Frontier logo]()
$119
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.
Mon 5/188:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Wed 5/2011:26 am
SFO
- ONT
Nonstop1h 39m
Frontier
Deal found 3/31![Frontier logo]()
$120
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 5/138:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Mon 5/189:19 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 4/1![Frontier logo]()
$121
This Trip.com deal was found by Cheapflights users on 4/3. Clicking the “Pick Dates” 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.
Mon 4/2011:44 am
ONT
- SFO
1 stop4h 52m
Frontier
Thu 4/239:18 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 4/3![Frontier logo]()
$122
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 5/78:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Tue 5/1212:52 pm
SFO
- ONT
1 stop10h 57m
Frontier
Deal found 4/1![Frontier logo]()
$123
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/239:10 am
ONT
- SFO
Nonstop1h 40m
Frontier
Mon 4/279:20 pm
SFO
- ONT
1 stop21h 29m
Frontier
Deal found 3/31![Frontier logo]()
$124
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 April 3, 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 April 3, 2026.
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.
Tue 4/214:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Mon 4/2710:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Deal found 3/30![Alaska Airlines logo]()
$147
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 4/282:10 pm
ONT
- SFO
2 stops8h 35m
Southwest
Wed 4/295:55 am
SFO
- ONT
2 stops9h 10m
Southwest
Deal found 3/31![Southwest logo]()
$161
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.
Wed 4/221:27 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Sat 5/28:10 am
SFO
- ONT
Nonstop1h 31m
United Airlines
Deal found 4/1![United Airlines logo]()
$217
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.
Thu 6/43:35 pm
ONT
- STS
Nonstop1h 29m
Alaska Airlines
Sat 6/65:44 pm
STS
- ONT
Nonstop1h 24m
Alaska Airlines
Deal found 4/1![Alaska Airlines logo]()
$157
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.
Thu 5/710:30 am
ONT
- SJC
Nonstop1h 15m
Southwest
Mon 5/118:20 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 3/30![Southwest logo]()
$177
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/2312:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Sun 4/2610:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Deal found 3/29![Alaska Airlines logo]()
$197
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 4/213:45 pm
ONT
- SJC
2 stops7h 15m
Southwest
Wed 4/223:15 pm
SJC
- ONT
1 stop6h 15m
Southwest
Deal found 3/29![Southwest logo]()
$202
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/712:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Sun 5/1010:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Deal found 3/29![Alaska Airlines logo]()
$197
This United Airlines deal was found by Cheapflights users on 4/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/16:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Mon 6/110:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 4/2![United Airlines logo]()
$244
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.
Sat 4/256:00 am
ONT
- SFO
Nonstop1h 29m
United Airlines
Mon 4/2710:50 am
SFO
- ONT
Nonstop1h 30m
United Airlines
Deal found 3/30![United Airlines logo]()
$246
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.
Mon 5/183:00 pm
ONT
- SFO
2 stops7h 10m
Southwest
Wed 5/2010:30 am
SFO
- ONT
1 stop4h 35m
Southwest
Deal found 3/30![Southwest logo]()
$224
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.
Tue 9/294:18 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Sat 10/173:45 pm
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Deal found 3/30![Alaska Airlines logo]()
$217
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.
Wed 4/221:27 pm
ONT
- SFO
Nonstop1h 29m
United Airlines
Wed 4/229:09 pm
SFO
- ONT
Nonstop1h 36m
United Airlines
Deal found 3/29![United Airlines logo]()
$247
This Southwest deal was found by Cheapflights users on 4/2. Clicking the “Pick Dates” 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 5/13:35 pm
ONT
- STS
2 stops7h 05m
Southwest
Mon 5/44:40 pm
STS
- ONT
2 stops6h 25m
Southwest
Deal found 4/2![Southwest logo]()
$227
This Alaska 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/283:35 pm
ONT
- STS
Nonstop1h 29m
Alaska Airlines
Mon 6/15:44 pm
STS
- ONT
Nonstop1h 24m
Alaska Airlines
Deal found 3/29![Alaska Airlines logo]()
$217
This Southwest deal was found by Cheapflights users on 4/3. Clicking the “Pick Dates” 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 5/43:00 pm
ONT
- OAK
1 stop7h 05m
Southwest
Thu 5/710:50 am
OAK
- ONT
Nonstop1h 20m
Southwest
Deal found 4/3![Southwest logo]()
$231
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.
Thu 4/164:22 pm
ONT
- STS
Nonstop2h 00m
Alaska Airlines
Tue 4/212:12 pm
STS
- ONT
Nonstop1h 30m
Alaska Airlines
Deal found 3/30![Alaska Airlines logo]()
$237
This United Airlines deal was found by Cheapflights users on 4/3. Clicking the “Pick Dates” 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 5/296:00 am
ONT
- SFO
Nonstop1h 25m
United Airlines
Mon 6/110:40 am
SFO
- ONT
Nonstop1h 32m
United Airlines
Deal found 4/3![United Airlines logo]()
$297
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 4/236:50 pm
ONT
- SJC
Nonstop1h 10m
Southwest
Sun 4/269:50 am
SJC
- ONT
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 5/66:00 am
ONT
- STS
1 stop6h 21m
Alaska Airlines
Tue 5/1210:41 am
STS
- ONT
Nonstop1h 27m
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.
Sat 5/169:30 am
ONT
- OAK
2 stops9h 30m
Southwest
Tue 5/193:35 pm
OAK
- ONT
2 stops6h 10m
Southwest
Deal found 3/29![Southwest logo]()
$251
This Alaska Airlines deal was found by Cheapflights users on 4/2. Clicking the “Pick Dates” 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 5/212:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Sat 5/91:13 pm
STS
- ONT
1 stop20h 32m
Alaska Airlines
Deal found 4/2![Alaska Airlines logo]()
$240
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 9/21:18 pm
ONT
- SJC
1 stop7h 52m
United Airlines
Sat 9/51:00 pm
SJC
- ONT
1 stop7h 52m
United Airlines
Deal found 3/30![United Airlines logo]()
$323
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.
Thu 5/73:00 pm
ONT
- SFO
2 stops7h 10m
Southwest
Sun 5/106:10 am
SFO
- ONT
1 stop4h 20m
Southwest
Deal found 3/30![Southwest logo]()
$253
This Alaska Airlines deal was found by Cheapflights users on 4/3. Clicking the “Pick Dates” 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.
Sun 9/134:18 pm
ONT
- STS
Nonstop1h 31m
Alaska Airlines
Thu 9/172:09 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 4/3![Alaska Airlines logo]()
$257
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 6/186:15 am
ONT
- OAK
Nonstop1h 25m
Southwest
Mon 6/227:00 pm
OAK
- ONT
Nonstop1h 20m
Southwest
Deal found 3/29![Southwest logo]()
$279
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 6/83:35 pm
ONT
- STS
Nonstop1h 29m
Alaska Airlines
Wed 6/104:35 pm
STS
- ONT
Nonstop1h 28m
Alaska Airlines
Deal found 3/30![Alaska Airlines logo]()
$257
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 5/192:25 pm
ONT
- SFO
1 stop4h 40m
Southwest
Wed 5/208:55 am
SFO
- ONT
2 stops6h 10m
Southwest
Deal found 3/29![Southwest logo]()
$284
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.
Sat 4/259:30 am
ONT
- OAK
2 stops9h 30m
Southwest
Sun 4/267:10 pm
OAK
- ONT
1 stop4h 25m
Southwest
Deal found 3/29![Southwest logo]()
$285
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.
Fri 4/248:25 pm
ONT
- OAK
Nonstop1h 20m
Southwest
Sun 4/2610:55 am
OAK
- ONT
Nonstop1h 20m
Southwest
Deal found 3/31![Southwest logo]()
$299
Last-minute flights from Ontario to San Francisco Bay AreaDiscover last-minute flight deals from Ontario to San Francisco Bay Area. Data last updated April 3, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to San Francisco Bay Area. Data last updated April 3, 2026 and is based on user searches.
This Trip.com deal was found by Cheapflights users on 4/3. Clicking the “Pick Dates” 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.
Mon 4/2011:44 am
ONT
- SFO
1 stop4h 52m
Frontier
Thu 4/239:18 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 4/3![Frontier logo]()
$122
This CheapOair 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/239:10 am
ONT
- SFO
Nonstop1h 40m
Frontier
Mon 4/279:20 pm
SFO
- ONT
1 stop21h 29m
Frontier
Deal found 3/31![Frontier logo]()
$124
This Kiwi.com deal was found by Cheapflights users on 4/2. Clicking the “Pick Dates” 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 4/2712:59 am
ONT
- SFO
1 stop22h 26m
Frontier
Thu 4/309:18 am
SFO
- ONT
Nonstop1h 34m
Frontier
Deal found 4/2![Frontier logo]()
$116
This Southwest deal was found by Cheapflights users on 4/2. Clicking the “Pick Dates” 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 4/285:45 am
ONT
- SJC
Nonstop1h 15m
Southwest
Wed 5/612:30 pm
SJC
- ONT
Nonstop1h 15m
Southwest
Deal found 4/2![Southwest logo]()
$117
This Alaska Airlines deal was found by Cheapflights users on 4/3. Clicking the “Pick Dates” 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 4/2912:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Sat 5/210:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Deal found 4/3![Alaska Airlines logo]()
$97
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/309:10 am
ONT
- SFO
Nonstop1h 40m
Frontier
Sat 5/99:19 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 3/31![Frontier logo]()
$117
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 5/78:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Sun 5/1010:40 pm
SFO
- ONT
1 stop9h 09m
Frontier
Deal found 4/1![Frontier logo]()
$123
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.
Sat 5/912:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Tue 5/1210:41 am
STS
- ONT
Nonstop1h 27m
Alaska Airlines
Deal found 3/30![Alaska Airlines logo]()
$117
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 5/138:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Mon 5/189:19 am
SFO
- ONT
Nonstop1h 32m
Frontier
Deal found 4/1![Frontier logo]()
$121
This Booking.com deal was found by Cheapflights users on 4/3. Clicking the “Pick Dates” 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 5/148:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Sat 5/169:15 am
SFO
- ONT
1 stop5h 54m
Frontier
Deal found 4/3![Frontier logo]()
$119
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.
Mon 5/188:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Wed 5/2011:26 am
SFO
- ONT
Nonstop1h 39m
Frontier
Deal found 3/31![Frontier logo]()
$120
This Frontier deal was found by Cheapflights users on 4/3. Clicking the “Pick Dates” 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 5/268:59 am
ONT
- SFO
Nonstop1h 39m
Frontier
Sat 5/3012:52 pm
SFO
- ONT
1 stop10h 57m
Frontier
Deal found 4/3![Frontier logo]()
$118
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 April 3, 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 April 3, 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.
Wed 5/205:45 am
ONT
- SJC
Nonstop1h 15m
Southwest
Deal found 3/31![Southwest logo]()
$59
This Trip.com deal was found by Cheapflights users on 4/2. Clicking the “Pick Dates” 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.
Tue 4/2812:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Deal found 4/2![Alaska Airlines logo]()
$67
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/309:10 am
ONT
- SFO
Nonstop1h 40m
Frontier
Deal found 3/29![Frontier logo]()
$68
This Alaska Airlines deal was found by Cheapflights users on 4/3. Clicking the “Pick Dates” 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 4/2912:48 pm
ONT
- STS
Nonstop1h 32m
Alaska Airlines
Deal found 4/3![Alaska Airlines logo]()
$69
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/238:17 pm
ONT
- SFO
Nonstop1h 38m
Frontier
Deal found 3/30![Frontier logo]()
$69
This Frontier 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2111:44 am
ONT
- SFO
1 stop7h 01m
Frontier
Deal found 3/29![Frontier logo]()
$70
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.
Fri 5/88:44 am
ONT
- SJC
1 stop4h 33m
Frontier
Deal found 3/31![Frontier logo]()
$70
This Frontier deal was found by Cheapflights users on 4/2. Clicking the “Pick Dates” 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 4/199:10 am
ONT
- SFO
Nonstop1h 40m
Frontier
Deal found 4/2![Frontier logo]()
$74
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.
Tue 5/1210:30 am
ONT
- SJC
2 stops6h 50m
Southwest
Deal found 4/1![Southwest logo]()
$74
This Frontier deal was found by Cheapflights users on 4/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/228:59 am
ONT
- SFO
Nonstop1h 39m
Frontier
Deal found 4/2![Frontier logo]()
$75
This Super.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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/74:04 pm
ONT
- SJC
1 stop21h 13m
Frontier
Deal found 3/31![Frontier logo]()
$75
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 5/58:30 am
ONT
- SFO
1 stop14h 34m
Frontier
Deal found 3/31![Frontier logo]()
$76
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 April 3, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $97 (Alaska Airlines) |
One-way from | $59 (Southwest) |
Popular in | February |
Cheapest in | July |
Average price | $177 |
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 April 3, 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
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Tue 4/21
4:22 pm-6:22 pm
Nonstop2h 00m
Santa Rosa Sonoma County
Mon 4/27
10:41 am-12:08 pm
Nonstop1h 27m
$147
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Thu 6/4
3:35 pm-5:04 pm
Nonstop1h 29m
Santa Rosa Sonoma County
Sat 6/6
5:44 pm-7:08 pm
Nonstop1h 24m
$157
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Tue 4/28
2:10 pm-10:45 pm
2 stops8h 35m
San Francisco
Wed 4/29
5:55 am-3:05 pm
2 stops9h 10m
$161
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Thu 5/7
10:30 am-11:45 am
Nonstop1h 15m
San Jose
Mon 5/11
8:20 pm-9:35 pm
Nonstop1h 15m
$177
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Thu 4/23
12:48 pm-2:20 pm
Nonstop1h 32m
Santa Rosa Sonoma County
Sun 4/26
10:41 am-12:08 pm
Nonstop1h 27m
$197
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Thu 5/7
12:48 pm-2:20 pm
Nonstop1h 32m
Santa Rosa Sonoma County
Sun 5/10
10:41 am-12:08 pm
Nonstop1h 27m
$197
OntarioSan Jose
ONT - SJC
ONTSJC
Ontario
Tue 4/21
3:45 pm-11:00 pm
2 stops7h 15m
San Jose
Wed 4/22
3:15 pm-9:30 pm
1 stop6h 15m
$202
OntarioSan Francisco
ONT - SFO
ONTSFO
Ontario
Wed 4/22
1:27 pm-2:56 pm
Nonstop1h 29m
San Francisco
Sat 5/2
8:10 am-9:41 am
Nonstop1h 31m
$217
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Tue 9/29
4:18 pm-5:49 pm
Nonstop1h 31m
Santa Rosa Sonoma County
Sat 10/17
3:45 pm-5:12 pm
Nonstop1h 27m
$217
OntarioSanta Rosa
ONT - STS
ONTSTS
Ontario
Thu 5/28
3:35 pm-5:04 pm
Nonstop1h 29m
Santa Rosa Sonoma County
Mon 6/1
5:44 pm-7:08 pm
Nonstop1h 24m
$217
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-STS
ONT-SFO
ONT-SJC
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-STS
ONT-SFO
ONT-SJC
ONT-OAK
What is the cheapest month to book a flight from Ontario to San Francisco Bay Area?
Currently, May 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 November is currently the most expensive (average of $62). 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 April 3, 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 29% on airfare.
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 March 28, 2026.
Travelers seeking maximum savings on their Ontario to San Francisco Bay Area flight should consider departing on Sunday mornings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Weekly flight availability from Ontario to San Francisco Bay Area
Explore weekly flight availability from Ontario to San Francisco Bay Area. 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 3, 2026.
The most flights from ONT to zzXIH are scheduled on a Thursday (12 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (4 on average).
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 April 3, 2026.
Get a feel of what it's like to fly with Southwest,Alaska Airlines, 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.
Food
7.0
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
Food
7.0
Boarding
8.1
Comfort
8.0
Overall
8.0
Entertainment
7.5
Crew
8.6
Reviews
1 / 20
2.0
MediocreDominic,Mar 2026
MCO - SMF
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.
Alternative routes
Complete your trip
Flights by cabin class
Other flight options
Popular flights
Top destinations
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 April 3, 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 5 airlines flying from Ontario to San Francisco Bay Area
Discover the top 5 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 April 3, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$29 | Average$117 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$65 | Average$192 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$78 | Average$180 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$108 | Average$300 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$222 | Average$416 | FlexibilityNo cancel fee | On-time71% |