$39 Cheap Frontier Airlines flights Ontario (ONT) to San Francisco (SFO)

$39 Cheap Frontier Airlines flights Ontario (ONT) to San Francisco (SFO)

Prices were available within the past 7 days and start at $39 for one-way flights and $74 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, May 22 - Sat, May 31

ONT

Ontario

SFO

San Francisco

$74 Roundtrip, found 17 hours ago

$74

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Thu, May 22 from Ontario to San Francisco, returning Sat, May 31, priced at $74 found 17 hours ago

Sat, May 24 - Sat, May 31

ONT

Ontario

SFO

San Francisco

$78 Roundtrip, found 17 hours ago

$78

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Sat, May 24 from Ontario to San Francisco, returning Sat, May 31, priced at $78 found 17 hours ago

Thu, May 22 - Thu, May 29

ONT

Ontario

SFO

San Francisco

$79 Roundtrip, found 17 hours ago

$79

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Thu, May 22 from Ontario to San Francisco, returning Thu, May 29, priced at $79 found 17 hours ago

Sat, May 24 - Thu, May 29

ONT

Ontario

SFO

San Francisco

$83 Roundtrip, found 17 hours ago

$83

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Sat, May 24 from Ontario to San Francisco, returning Thu, May 29, priced at $83 found 17 hours ago

Thu, May 22 - Fri, May 30

ONT

Ontario

SFO

San Francisco

$84 Roundtrip, found 17 hours ago

$84

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Thu, May 22 from Ontario to San Francisco, returning Fri, May 30, priced at $84 found 17 hours ago

Sun, Jun 15 - Sun, Jun 22

ONT

Ontario

SFO

San Francisco

$88 Roundtrip, found 1 hour ago

$88

Roundtrip

found 1 hour ago

Select Frontier Airlines flight, departing Sun, Jun 15 from Ontario to San Francisco, returning Sun, Jun 22, priced at $88 found 1 hour ago