$56 Cheap Frontier Airlines flights Ontario (ONT) to San Francisco (SFO)

$56 Cheap Frontier Airlines flights Ontario (ONT) to San Francisco (SFO)

Prices were available within the past 7 days and start at $56 for one-way flights and $103 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Aug 18 - Thu, Aug 21

ONT

Ontario

SFO

San Francisco

$103 Roundtrip, found 5 days ago

$103

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Mon, Aug 18 from Ontario to San Francisco, returning Thu, Aug 21, priced at $103 found 5 days ago

Mon, Jul 21 - Mon, Jul 28

ONT

Ontario

SFO

San Francisco

$112 Roundtrip, found 1 hour ago

$112

Roundtrip

found 1 hour ago

Select Frontier Airlines flight, departing Mon, Jul 21 from Ontario to San Francisco, returning Mon, Jul 28, priced at $112 found 1 hour ago

Mon, Jul 21 - Sun, Jul 27

ONT

Ontario

SFO

San Francisco

$113 Roundtrip, found 5 days ago

$113

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Mon, Jul 21 from Ontario to San Francisco, returning Sun, Jul 27, priced at $113 found 5 days ago

Fri, Jul 18 - Sun, Jul 20

ONT

Ontario

SFO

San Francisco

$116 Roundtrip, found 5 days ago

$116

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Fri, Jul 18 from Ontario to San Francisco, returning Sun, Jul 20, priced at $116 found 5 days ago

Thu, Aug 21 - Thu, Aug 28

ONT

Ontario

SFO

San Francisco

$118 Roundtrip, found 5 days ago

$118

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Thu, Aug 21 from Ontario to San Francisco, returning Thu, Aug 28, priced at $118 found 5 days ago

Fri, Jul 18 - Sun, Jul 27

ONT

Ontario

SFO

San Francisco

$124 Roundtrip, found 5 days ago

$124

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Fri, Jul 18 from Ontario to San Francisco, returning Sun, Jul 27, priced at $124 found 5 days ago