$59 Cheap Frontier Airlines flights Seattle (SEA) to Ontario (ONT)

$59 Cheap Frontier Airlines flights Seattle (SEA) 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.

Sun, May 24 - Tue, Jun 9

SEA

Seattle

ONT

Ontario

$118 Roundtrip, found 5 hours ago

$118

Roundtrip

found 5 hours ago

Select Frontier Airlines flight, departing Sun, May 24 from Seattle to Ontario, returning Tue, Jun 9, priced at $118 found 5 hours ago

Sat, May 23 - Tue, Jun 9

SEA

Seattle

ONT

Ontario

$128 Roundtrip, found 1 day ago

$128

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, May 23 from Seattle to Ontario, returning Tue, Jun 9, priced at $128 found 1 day ago

Thu, May 21 - Mon, Jun 1

SEA

Seattle

ONT

Ontario

$133 Roundtrip, found 19 hours ago

$133

Roundtrip

found 19 hours ago

Select Frontier Airlines flight, departing Thu, May 21 from Seattle to Ontario, returning Mon, Jun 1, priced at $133 found 19 hours ago

Sun, Apr 26 - Thu, Apr 30

SEA

Seattle

ONT

Ontario

$150 Roundtrip, found 1 day ago

$150

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sun, Apr 26 from Seattle to Ontario, returning Thu, Apr 30, priced at $150 found 1 day ago

Thu, May 21 - Sun, Jun 7

SEA

Seattle

ONT

Ontario

$153 Roundtrip, found 1 day ago

$153

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, May 21 from Seattle to Ontario, returning Sun, Jun 7, priced at $153 found 1 day ago

Fri, May 1 - Fri, May 22

SEA

Seattle

ONT

Ontario

$154 Roundtrip, found 19 hours ago

$154

Roundtrip

found 19 hours ago

Select Frontier Airlines flight, departing Fri, May 1 from Seattle to Ontario, returning Fri, May 22, priced at $154 found 19 hours ago