$33 Cheap Frontier Airlines flights San Francisco (SFO) to Ontario (ONT)

$33 Cheap Frontier Airlines flights San Francisco (SFO) to Ontario (ONT)

Prices were available within the past 7 days and start at $33 for one-way flights and $76 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Apr 23 - Thu, Apr 30

SFO

San Francisco

ONT

Ontario

$76 Roundtrip, found 1 day ago

$76

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Apr 23 from San Francisco to Ontario, returning Thu, Apr 30, priced at $76 found 1 day ago

Tue, May 26 - Tue, Jun 9

SFO

San Francisco

ONT

Ontario

$86 Roundtrip, found 1 day ago

$86

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, May 26 from San Francisco to Ontario, returning Tue, Jun 9, priced at $86 found 1 day ago

Thu, Apr 23 - Tue, May 12

SFO

San Francisco

ONT

Ontario

$102 Roundtrip, found 1 day ago

$102

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Apr 23 from San Francisco to Ontario, returning Tue, May 12, priced at $102 found 1 day ago

Wed, May 20 - Tue, Jun 9

SFO

San Francisco

ONT

Ontario

$104 Roundtrip, found 1 day ago

$104

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, May 20 from San Francisco to Ontario, returning Tue, Jun 9, priced at $104 found 1 day ago

Sat, May 23 - Tue, Jun 9

SFO

San Francisco

ONT

Ontario

$112 Roundtrip, found 1 day ago

$112

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, May 23 from San Francisco to Ontario, returning Tue, Jun 9, priced at $112 found 1 day ago

Thu, Apr 23 - Sun, Apr 26

SFO

San Francisco

ONT

Ontario

$117 Roundtrip, found 1 day ago

$117

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Apr 23 from San Francisco to Ontario, returning Sun, Apr 26, priced at $117 found 1 day ago