$44 Cheap Frontier Airlines flights San Francisco (SFO) to Ontario (ONT)

$44 Cheap Frontier Airlines flights San Francisco (SFO) to Ontario (ONT)

Prices were available within the past 7 days and start at $44 for one-way flights and $143 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Aug 11 - Thu, Aug 21

SFO

San Francisco

ONT

Ontario

$143 Roundtrip, found 13 hours ago

$143

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Mon, Aug 11 from San Francisco to Ontario, returning Thu, Aug 21, priced at $143 found 13 hours ago

Mon, Aug 11 - Fri, Aug 22

SFO

San Francisco

ONT

Ontario

$153 Roundtrip, found 13 hours ago

$153

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Mon, Aug 11 from San Francisco to Ontario, returning Fri, Aug 22, priced at $153 found 13 hours ago

Mon, Aug 11 - Mon, Aug 18

SFO

San Francisco

ONT

Ontario

$157 Roundtrip, found 13 hours ago

$157

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Mon, Aug 11 from San Francisco to Ontario, returning Mon, Aug 18, priced at $157 found 13 hours ago

Mon, Aug 11 - Sun, Aug 17

SFO

San Francisco

ONT

Ontario

$172 Roundtrip, found 13 hours ago

$172

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Mon, Aug 11 from San Francisco to Ontario, returning Sun, Aug 17, priced at $172 found 13 hours ago

Fri, Aug 8 - Mon, Aug 18

SFO

San Francisco

ONT

Ontario

$180 Roundtrip, found 1 day ago

$180

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Aug 8 from San Francisco to Ontario, returning Mon, Aug 18, priced at $180 found 1 day ago

Fri, Aug 8 - Mon, Aug 11

SFO

San Francisco

ONT

Ontario

$193 Roundtrip, found 1 day ago

$193

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Aug 8 from San Francisco to Ontario, returning Mon, Aug 11, priced at $193 found 1 day ago

Fri, Aug 8 - Fri, Aug 15

SFO

San Francisco

ONT

Ontario

$195 Roundtrip, found 1 day ago

$195

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Aug 8 from San Francisco to Ontario, returning Fri, Aug 15, priced at $195 found 1 day ago

Fri, Aug 8 - Mon, Aug 11

SFO

San Francisco

ONT

Ontario

$203 Roundtrip, found 1 day ago

$203

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Aug 8 from San Francisco to Ontario, returning Mon, Aug 11, priced at $203 found 1 day ago