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

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

Prices were available within the past 7 days and start at $33 for one-way flights and $138 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, May 20 - Thu, Jun 11

ONT

Ontario

SFO

San Francisco

$138 Roundtrip, found 4 days ago

$138

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Wed, May 20 from Ontario to San Francisco, returning Thu, Jun 11, priced at $138 found 4 days ago

Fri, May 1 - Sat, May 16

ONT

Ontario

SFO

San Francisco

$144 Roundtrip, found 4 days ago

$144

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Fri, May 1 from Ontario to San Francisco, returning Sat, May 16, priced at $144 found 4 days ago

Tue, May 5 - Sun, May 17

ONT

Ontario

SFO

San Francisco

$148 Roundtrip, found 4 days ago

$148

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Tue, May 5 from Ontario to San Francisco, returning Sun, May 17, priced at $148 found 4 days ago

Wed, May 20 - Sat, Jun 6

ONT

Ontario

SFO

San Francisco

$153 Roundtrip, found 4 days ago

$153

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Wed, May 20 from Ontario to San Francisco, returning Sat, Jun 6, priced at $153 found 4 days ago

Fri, May 1 - Sun, May 17

ONT

Ontario

SFO

San Francisco

$154 Roundtrip, found 4 days ago

$154

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Fri, May 1 from Ontario to San Francisco, returning Sun, May 17, priced at $154 found 4 days ago

Sun, May 3 - Sun, May 17

ONT

Ontario

SFO

San Francisco

$158 Roundtrip, found 4 days ago

$158

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Sun, May 3 from Ontario to San Francisco, returning Sun, May 17, priced at $158 found 4 days ago