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

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

Prices were available within the past 7 days and start at $59 for one-way flights and $134 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Apr 29 - Fri, May 22

ONT

Ontario

SEA

Seattle

$134 Roundtrip, found 21 hours ago

$134

Roundtrip

found 21 hours ago

Select Frontier Airlines flight, departing Wed, Apr 29 from Ontario to Seattle, returning Fri, May 22, priced at $134 found 21 hours ago

Wed, Apr 29 - Thu, May 21

ONT

Ontario

SEA

Seattle

$149 Roundtrip, found 21 hours ago

$149

Roundtrip

found 21 hours ago

Select Frontier Airlines flight, departing Wed, Apr 29 from Ontario to Seattle, returning Thu, May 21, priced at $149 found 21 hours ago

Sat, May 16 - Sat, May 30

ONT

Ontario

SEA

Seattle

$154 Roundtrip, found 21 hours ago

$154

Roundtrip

found 21 hours ago

Select Frontier Airlines flight, departing Sat, May 16 from Ontario to Seattle, returning Sat, May 30, priced at $154 found 21 hours ago

Thu, Apr 30 - Thu, May 21

ONT

Ontario

SEA

Seattle

$169 Roundtrip, found 21 hours ago

$169

Roundtrip

found 21 hours ago

Select Frontier Airlines flight, departing Thu, Apr 30 from Ontario to Seattle, returning Thu, May 21, priced at $169 found 21 hours ago

Sun, Apr 26 - Mon, Apr 27

ONT

Ontario

SEA

Seattle

$170 Roundtrip, found 21 hours ago

$170

Roundtrip

found 21 hours ago

Select Frontier Airlines flight, departing Sun, Apr 26 from Ontario to Seattle, returning Mon, Apr 27, priced at $170 found 21 hours ago

Fri, May 1 - Fri, May 22

ONT

Ontario

SEA

Seattle

$175 Roundtrip, found 21 hours ago

$175

Roundtrip

found 21 hours ago

Select Frontier Airlines flight, departing Fri, May 1 from Ontario to Seattle, returning Fri, May 22, priced at $175 found 21 hours ago