$49 Cheap Frontier Airlines flights Ontario (ONT) to Seattle (SEA)

$49 Cheap Frontier Airlines flights Ontario (ONT) to Seattle (SEA)

Prices were available within the past 7 days and start at $49 for one-way flights and $98 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, May 28 - Sat, May 31

ONT

Ontario

SEA

Seattle

$98 Roundtrip, found 23 hours ago

$98

Roundtrip

found 23 hours ago

Select Frontier Airlines flight, departing Wed, May 28 from Ontario to Seattle, returning Sat, May 31, priced at $98 found 23 hours ago

Sun, May 25 - Sat, May 31

ONT

Ontario

SEA

Seattle

$108 Roundtrip, found 23 hours ago

$108

Roundtrip

found 23 hours ago

Select Frontier Airlines flight, departing Sun, May 25 from Ontario to Seattle, returning Sat, May 31, priced at $108 found 23 hours ago

Tue, Jun 17 - Sat, Jun 28

ONT

Ontario

SEA

Seattle

$115 Roundtrip, found 3 days ago

$115

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Tue, Jun 17 from Ontario to Seattle, returning Sat, Jun 28, priced at $115 found 3 days ago

Sat, Jun 21 - Sat, Jun 28

ONT

Ontario

SEA

Seattle

$118 Roundtrip, found 3 days ago

$118

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sat, Jun 21 from Ontario to Seattle, returning Sat, Jun 28, priced at $118 found 3 days ago

Mon, Jun 16 - Sat, Jun 28

ONT

Ontario

SEA

Seattle

$123 Roundtrip, found 3 days ago

$123

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Mon, Jun 16 from Ontario to Seattle, returning Sat, Jun 28, priced at $123 found 3 days ago

Tue, May 27 - Tue, Jun 3

ONT

Ontario

SEA

Seattle

$136 Roundtrip, found 23 hours ago

$136

Roundtrip

found 23 hours ago

Select Frontier Airlines flight, departing Tue, May 27 from Ontario to Seattle, returning Tue, Jun 3, priced at $136 found 23 hours ago