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

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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 May , June 2026

31 May - 10 Jun $ 153.00
ONT
Ontario
Frontier Airlines
DIRECT
SFO
San Francisco
SFO
San Francisco
Frontier Airlines
DIRECT
ONT
Ontario
Pick dates
27 May - 10 Jun $ 177.00
ONT
Ontario
Frontier Airlines
DIRECT
SFO
San Francisco
SFO
San Francisco
Frontier Airlines
DIRECT
ONT
Ontario
Pick dates
18 May - 05 Jun $ 313.00
ONT
Ontario
Frontier Airlines
DIRECT
SFO
San Francisco
SFO
San Francisco
Frontier Airlines
DIRECT
ONT
Ontario
Pick dates

Last minute flights from Ontario to San Francisco

28 May - 31 May $ 274.00
ONT
Ontario
Frontier Airlines
DIRECT
SFO
San Francisco
SFO
San Francisco
Frontier Airlines
DIRECT
ONT
Ontario
Pick dates
27 May - 31 May $ 274.00
ONT
Ontario
Frontier Airlines
DIRECT
SFO
San Francisco
SFO
San Francisco
Frontier Airlines
DIRECT
ONT
Ontario
Pick dates
26 May - 31 May $ 543.00
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

8:59 AM - 8:59 AM
Frontier Airlines
0 Stops
1h 39m
ONT - SFO
$ 125
Kiwi
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8:59 AM - 8:59 AM
Frontier Airlines
0 Stops
1h 39m
ONT - SFO
$ 149
Kiwi
Pick dates
1:50 PM - 1:50 PM
United Airlines
0 Stops
1h 23m
ONT - SFO
$ 272
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.