$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 3 days ago

$143

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Mon, Aug 11 from San Francisco to Ontario, returning Thu, Aug 21, priced at $143 found 3 days ago

Thu, Aug 28 - Thu, Sep 4

SFO

San Francisco

ONT

Ontario

$148 Roundtrip, found 2 days ago

$148

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Thu, Aug 28 from San Francisco to Ontario, returning Thu, Sep 4, priced at $148 found 2 days ago

Mon, Aug 11 - Fri, Aug 22

SFO

San Francisco

ONT

Ontario

$153 Roundtrip, found 3 days ago

$153

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Mon, Aug 11 from San Francisco to Ontario, returning Fri, Aug 22, priced at $153 found 3 days ago

Mon, Aug 11 - Mon, Aug 18

SFO

San Francisco

ONT

Ontario

$157 Roundtrip, found 3 days ago

$157

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Mon, Aug 11 from San Francisco to Ontario, returning Mon, Aug 18, priced at $157 found 3 days ago

Sun, Aug 31 - Thu, Sep 4

SFO

San Francisco

ONT

Ontario

$158 Roundtrip, found 2 days ago

$158

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Sun, Aug 31 from San Francisco to Ontario, returning Thu, Sep 4, priced at $158 found 2 days ago

Mon, Aug 11 - Sun, Aug 17

SFO

San Francisco

ONT

Ontario

$172 Roundtrip, found 3 days ago

$172

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Mon, Aug 11 from San Francisco to Ontario, returning Sun, Aug 17, priced at $172 found 3 days ago

Thu, Aug 28 - Mon, Sep 1

SFO

San Francisco

ONT

Ontario

$253 Roundtrip, found 2 days ago

$253

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Thu, Aug 28 from San Francisco to Ontario, returning Mon, Sep 1, priced at $253 found 2 days ago

Sun, Aug 31 - Mon, Sep 1

SFO

San Francisco

ONT

Ontario

$263 Roundtrip, found 2 days ago

$263

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Sun, Aug 31 from San Francisco to Ontario, returning Mon, Sep 1, priced at $263 found 2 days ago

Fri, Aug 29 - Mon, Sep 1

SFO

San Francisco

ONT

Ontario

$300 Roundtrip, found 2 days ago

$300

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Fri, Aug 29 from San Francisco to Ontario, returning Mon, Sep 1, priced at $300 found 2 days ago