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

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

Prices were available within the past 7 days and start at for one-way flights and $170 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Jan 21 - Sat, Jan 24

ONT

Ontario

SEA

Seattle

$170 Roundtrip, found 3 days ago

$170

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Wed, Jan 21 from Ontario to Seattle, returning Sat, Jan 24, priced at $170 found 3 days ago

Thu, Jan 15 - Sat, Jan 24

ONT

Ontario

SEA

Seattle

$191 Roundtrip, found 3 days ago

$191

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Thu, Jan 15 from Ontario to Seattle, returning Sat, Jan 24, priced at $191 found 3 days ago

Wed, Jan 21 - Fri, Jan 23

ONT

Ontario

SEA

Seattle

$205 Roundtrip, found 3 days ago

$205

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Wed, Jan 21 from Ontario to Seattle, returning Fri, Jan 23, priced at $205 found 3 days ago

Thu, Jan 15 - Fri, Jan 23

ONT

Ontario

SEA

Seattle

$226 Roundtrip, found 3 days ago

$226

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Thu, Jan 15 from Ontario to Seattle, returning Fri, Jan 23, priced at $226 found 3 days ago

Sun, Jan 18 - Sat, Jan 24

ONT

Ontario

SEA

Seattle

$270 Roundtrip, found 3 days ago

$270

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sun, Jan 18 from Ontario to Seattle, returning Sat, Jan 24, priced at $270 found 3 days ago

Sun, Jan 18 - Fri, Jan 23

ONT

Ontario

SEA

Seattle

$305 Roundtrip, found 3 days ago

$305

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sun, Jan 18 from Ontario to Seattle, returning Fri, Jan 23, priced at $305 found 3 days ago

Thu, Jan 15 - Mon, Jan 19

ONT

Ontario

SEA

Seattle

$370 Roundtrip, found 3 days ago

$370

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Thu, Jan 15 from Ontario to Seattle, returning Mon, Jan 19, priced at $370 found 3 days ago