$34 Cheap Frontier Airlines flights Ontario (ONT) to Seattle (SEA)

$34 Cheap Frontier Airlines flights Ontario (ONT) to Seattle (SEA)

Prices were available within the past 7 days and start at $34 for one-way flights and $79 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Dec 20 - Fri, Jan 2

ONT

Ontario

SEA

Seattle

$79 Roundtrip, found 1 day ago

$79

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Dec 20 from Ontario to Seattle, returning Fri, Jan 2, priced at $79 found 1 day ago

Tue, Dec 23 - Fri, Jan 2

ONT

Ontario

SEA

Seattle

$119 Roundtrip, found 1 day ago

$119

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Dec 23 from Ontario to Seattle, returning Fri, Jan 2, priced at $119 found 1 day ago

Fri, Dec 19 - Tue, Dec 30

ONT

Ontario

SEA

Seattle

$136 Roundtrip, found 1 day ago

$136

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Dec 19 from Ontario to Seattle, returning Tue, Dec 30, priced at $136 found 1 day ago

Fri, Dec 19 - Mon, Dec 29

ONT

Ontario

SEA

Seattle

$153 Roundtrip, found 1 day ago

$153

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Dec 19 from Ontario to Seattle, returning Mon, Dec 29, priced at $153 found 1 day ago

Mon, Nov 24 - Fri, Nov 28

ONT

Ontario

SEA

Seattle

$158 Roundtrip, found 7 hours ago

$158

Roundtrip

found 7 hours ago

Select Frontier Airlines flight, departing Mon, Nov 24 from Ontario to Seattle, returning Fri, Nov 28, priced at $158 found 7 hours ago

Thu, Dec 25 - Fri, Jan 2

ONT

Ontario

SEA

Seattle

$161 Roundtrip, found 1 day ago

$161

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Dec 25 from Ontario to Seattle, returning Fri, Jan 2, priced at $161 found 1 day ago

Fri, Dec 26 - Fri, Jan 2

ONT

Ontario

SEA

Seattle

$174 Roundtrip, found 1 day ago

$174

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Dec 26 from Ontario to Seattle, returning Fri, Jan 2, priced at $174 found 1 day ago

Tue, Dec 23 - Tue, Dec 30

ONT

Ontario

SEA

Seattle

$176 Roundtrip, found 1 day ago

$176

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Dec 23 from Ontario to Seattle, returning Tue, Dec 30, priced at $176 found 1 day ago

Mon, Nov 24 - Thu, Nov 27

ONT

Ontario

SEA

Seattle

$190 Roundtrip, found 7 hours ago

$190

Roundtrip

found 7 hours ago

Select Frontier Airlines flight, departing Mon, Nov 24 from Ontario to Seattle, returning Thu, Nov 27, priced at $190 found 7 hours ago