$44 Cheap Frontier Airlines flights Ontario (ONT) to San Francisco (SFO)

$44 Cheap Frontier Airlines flights Ontario (ONT) to San Francisco (SFO)

Prices were available within the past 7 days and start at $44 for one-way flights and $88 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Sep 15 - Mon, Sep 22

ONT

Ontario

SFO

San Francisco

$88 Roundtrip, found 2 days ago

$88

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Mon, Sep 15 from Ontario to San Francisco, returning Mon, Sep 22, priced at $88 found 2 days ago

Fri, Sep 26 - Mon, Sep 29

ONT

Ontario

SFO

San Francisco

$90 Roundtrip, found 9 hours ago

$90

Roundtrip

found 9 hours ago

Select Frontier Airlines flight, departing Fri, Sep 26 from Ontario to San Francisco, returning Mon, Sep 29, priced at $90 found 9 hours ago

Mon, Sep 22 - Fri, Sep 26

ONT

Ontario

SFO

San Francisco

$94 Roundtrip, found 9 hours ago

$94

Roundtrip

found 9 hours ago

Select Frontier Airlines flight, departing Mon, Sep 22 from Ontario to San Francisco, returning Fri, Sep 26, priced at $94 found 9 hours ago

Thu, Sep 25 - Fri, Sep 26

ONT

Ontario

SFO

San Francisco

$99 Roundtrip, found 9 hours ago

$99

Roundtrip

found 9 hours ago

Select Frontier Airlines flight, departing Thu, Sep 25 from Ontario to San Francisco, returning Fri, Sep 26, priced at $99 found 9 hours ago

Fri, Sep 12 - Mon, Sep 22

ONT

Ontario

SFO

San Francisco

$102 Roundtrip, found 5 days ago

$102

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Fri, Sep 12 from Ontario to San Francisco, returning Mon, Sep 22, priced at $102 found 5 days ago

Mon, Sep 22 - Thu, Sep 25

ONT

Ontario

SFO

San Francisco

$103 Roundtrip, found 9 hours ago

$103

Roundtrip

found 9 hours ago

Select Frontier Airlines flight, departing Mon, Sep 22 from Ontario to San Francisco, returning Thu, Sep 25, priced at $103 found 9 hours ago