$59 Cheap Frontier Airlines flights San Francisco (SFO) to Ontario (ONT)

$59 Cheap Frontier Airlines flights San Francisco (SFO) to Ontario (ONT)

Prices were available within the past 7 days and start at $59 for one-way flights and $118 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Jul 11 - Mon, Jul 14

SFO

San Francisco

ONT

Ontario

$118 Roundtrip, found 1 day ago

$118

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Jul 11 from San Francisco to Ontario, returning Mon, Jul 14, priced at $118 found 1 day ago

Mon, Jul 7 - Mon, Jul 14

SFO

San Francisco

ONT

Ontario

$123 Roundtrip, found 1 day ago

$123

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Jul 7 from San Francisco to Ontario, returning Mon, Jul 14, priced at $123 found 1 day ago

Sun, Jul 6 - Mon, Jul 14

SFO

San Francisco

ONT

Ontario

$138 Roundtrip, found 1 day ago

$138

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sun, Jul 6 from San Francisco to Ontario, returning Mon, Jul 14, priced at $138 found 1 day ago

Sun, Jul 6 - Mon, Jul 7

SFO

San Francisco

ONT

Ontario

$143 Roundtrip, found 1 day ago

$143

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sun, Jul 6 from San Francisco to Ontario, returning Mon, Jul 7, priced at $143 found 1 day ago

Fri, Jul 11 - Sun, Jul 13

SFO

San Francisco

ONT

Ontario

$148 Roundtrip, found 1 day ago

$148

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Jul 11 from San Francisco to Ontario, returning Sun, Jul 13, priced at $148 found 1 day ago

Mon, Jul 7 - Sun, Jul 13

SFO

San Francisco

ONT

Ontario

$153 Roundtrip, found 1 day ago

$153

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Jul 7 from San Francisco to Ontario, returning Sun, Jul 13, priced at $153 found 1 day ago

Sun, Jul 6 - Sun, Jul 13

SFO

San Francisco

ONT

Ontario

$168 Roundtrip, found 1 day ago

$168

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sun, Jul 6 from San Francisco to Ontario, returning Sun, Jul 13, priced at $168 found 1 day ago

Mon, Jun 23 - Fri, Jun 27

SFO

San Francisco

ONT

Ontario

$178 Roundtrip, found 3 hours ago

$178

Roundtrip

found 3 hours ago

Select Frontier Airlines flight, departing Mon, Jun 23 from San Francisco to Ontario, returning Fri, Jun 27, priced at $178 found 3 hours ago

Sun, Jun 22 - Fri, Jun 27

SFO

San Francisco

ONT

Ontario

$183 Roundtrip, found 3 hours ago

$183

Roundtrip

found 3 hours ago

Select Frontier Airlines flight, departing Sun, Jun 22 from San Francisco to Ontario, returning Fri, Jun 27, priced at $183 found 3 hours ago

Mon, Jun 23 - Sun, Jun 29

SFO

San Francisco

ONT

Ontario

$193 Roundtrip, found 3 hours ago

$193

Roundtrip

found 3 hours ago

Select Frontier Airlines flight, departing Mon, Jun 23 from San Francisco to Ontario, returning Sun, Jun 29, priced at $193 found 3 hours ago