$34 Cheap Frontier Airlines flights San Francisco (SFO) to Ontario (ONT)

$34 Cheap Frontier Airlines flights San Francisco (SFO) to Ontario (ONT)

Prices were available within the past 7 days and start at $34 for one-way flights and $68 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, May 10 - Mon, May 12

SFO

San Francisco

ONT

Ontario

$68 Roundtrip, found 5 days ago

$68

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Sat, May 10 from San Francisco to Ontario, returning Mon, May 12, priced at $68 found 5 days ago

Sat, May 10 - Sun, May 11

SFO

San Francisco

ONT

Ontario

$78 Roundtrip, found 5 days ago

$78

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Sat, May 10 from San Francisco to Ontario, returning Sun, May 11, priced at $78 found 5 days ago

Thu, May 29 - Mon, Jun 2

SFO

San Francisco

ONT

Ontario

$88 Roundtrip, found 18 hours ago

$88

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, May 29 from San Francisco to Ontario, returning Mon, Jun 2, priced at $88 found 18 hours ago

Mon, Jun 9 - Fri, Jun 13

SFO

San Francisco

ONT

Ontario

$89 Roundtrip, found 1 day ago

$89

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Jun 9 from San Francisco to Ontario, returning Fri, Jun 13, priced at $89 found 1 day ago

Mon, Jun 9 - Sun, Jun 15

SFO

San Francisco

ONT

Ontario

$99 Roundtrip, found 1 day ago

$99

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Jun 9 from San Francisco to Ontario, returning Sun, Jun 15, priced at $99 found 1 day ago

Mon, May 5 - Thu, May 8

SFO

San Francisco

ONT

Ontario

$121 Roundtrip, found 20 hours ago

$121

Roundtrip

found 20 hours ago

Select Frontier Airlines flight, departing Mon, May 5 from San Francisco to Ontario, returning Thu, May 8, priced at $121 found 20 hours ago