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

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

Prices were available within the past 7 days and start at $59 for one-way flights and $154 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Jun 9 - Tue, Jun 16

ONT

Ontario

SEA

Seattle

$154 Roundtrip, found 2 days ago

$154

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Tue, Jun 9 from Ontario to Seattle, returning Tue, Jun 16, priced at $154 found 2 days ago

Mon, Jun 8 - Tue, Jun 9

ONT

Ontario

SEA

Seattle

$158 Roundtrip, found 9 hours ago

$158

Roundtrip

found 9 hours ago

Select Frontier Airlines flight, departing Mon, Jun 8 from Ontario to Seattle, returning Tue, Jun 9, priced at $158 found 9 hours ago

Tue, Jun 9 - Wed, Jun 10

ONT

Ontario

SEA

Seattle

$159 Roundtrip, found 9 hours ago

$159

Roundtrip

found 9 hours ago

Select Frontier Airlines flight, departing Tue, Jun 9 from Ontario to Seattle, returning Wed, Jun 10, priced at $159 found 9 hours ago

Tue, Jun 9 - Tue, Jun 16

ONT

Ontario

SEA

Seattle

$173 Roundtrip, found 9 hours ago

$173

Roundtrip

found 9 hours ago

Select Frontier Airlines flight, departing Tue, Jun 9 from Ontario to Seattle, returning Tue, Jun 16, priced at $173 found 9 hours ago

Fri, Jun 5 - Tue, Jun 16

ONT

Ontario

SEA

Seattle

$174 Roundtrip, found 2 days ago

$174

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Fri, Jun 5 from Ontario to Seattle, returning Tue, Jun 16, priced at $174 found 2 days ago

Tue, Jun 9 - Thu, Jun 11

ONT

Ontario

SEA

Seattle

$178 Roundtrip, found 9 hours ago

$178

Roundtrip

found 9 hours ago

Select Frontier Airlines flight, departing Tue, Jun 9 from Ontario to Seattle, returning Thu, Jun 11, priced at $178 found 9 hours ago