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Cheap flights from Ontario (ONT) to San Francisco (SFO)

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1 Adults (11+)
0 Children (2~11)
0 Infants (0~2)
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How to find the cheapest flight from Ontario (ONT) to San Francisco (SFO)

How to find the cheapest flight from Ontario (ONT) to San Francisco (SFO)
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How to find the cheapest flight from Ontario (ONT) to San Francisco (SFO)
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How to find the cheapest flight from Ontario (ONT) to San Francisco (SFO)
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Cheap flights from Ontario to San Francisco in July , August 2026

28 Jul - 29 Aug $ 220.00
ONT
Ontario
Frontier Airlines
DIRECT
SFO
San Francisco
SFO
San Francisco
Frontier Airlines
DIRECT
ONT
Ontario
Pick dates
31 Jul - 08 Aug $ 315.00
ONT
Ontario
Frontier Airlines
1 STOPS
SFO
San Francisco
SFO
San Francisco
Frontier Airlines
1 STOPS
ONT
Ontario
Pick dates
24 Jul - 11 Aug $ 636.00
ONT
Ontario
United Airlines
DIRECT
SFO
San Francisco
SFO
San Francisco
United Airlines
DIRECT
ONT
Ontario
Pick dates

Last minute flights from Ontario to San Francisco

31 Jul - 01 Aug $ 384.00
ONT
Ontario
Frontier Airlines
1 STOPS
SFO
San Francisco
SFO
San Francisco
Frontier Airlines
1 STOPS
ONT
Ontario
Pick dates
28 Jul - 31 Jul $ 394.00
ONT
Ontario
Frontier Airlines
DIRECT
SFO
San Francisco
SFO
San Francisco
Frontier Airlines
DIRECT
ONT
Ontario
Pick dates
29 Jul - 31 Jul $ 580.00
ONT
Ontario
United Airlines
DIRECT
SFO
San Francisco
SFO
San Francisco
United Airlines
DIRECT
ONT
Ontario
Pick dates

One-way flights to San Francisco from Ontario

11:52 AM - 2:48 PM
Frontier Airlines
1 Stops
4h 49m
ONT - SFO
$ 189
Kiwi
Pick dates
8:58 AM - 8:58 AM
Frontier Airlines
0 Stops
1h 32m
ONT - SFO
$ 196
Kiwi
Pick dates
6:00 AM - 6:00 AM
United Airlines
0 Stops
1h 25m
ONT - SFO
$ 299
Kiwi
Pick dates

How to find the cheapest flight from Ontario (ONT) to San Francisco (SFO)

Related info for your journey
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How to find the cheapest flight from Ontario (ONT) to San Francisco (SFO)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Ontario (ONT) to San Francisco (SFO)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.