$66 Cheap Frontier Airlines flights Seattle (SEA) to Ontario (ONT)

$66 Cheap Frontier Airlines flights Seattle (SEA) to Ontario (ONT)

Prices were available within the past 7 days and start at $66 for one-way flights and $68 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Dec 5 - Sun, Dec 7

SEA

Seattle

ONT

Ontario

$68 Roundtrip, found 1 day ago

$68

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Dec 5 from Seattle to Ontario, returning Sun, Dec 7, priced at $68 found 1 day ago

Fri, Nov 21 - Mon, Nov 24

SEA

Seattle

ONT

Ontario

$108 Roundtrip, found 13 hours ago

$108

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Fri, Nov 21 from Seattle to Ontario, returning Mon, Nov 24, priced at $108 found 13 hours ago

Fri, Nov 21 - Wed, Nov 26

SEA

Seattle

ONT

Ontario

$113 Roundtrip, found 13 hours ago

$113

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Fri, Nov 21 from Seattle to Ontario, returning Wed, Nov 26, priced at $113 found 13 hours ago

Tue, Nov 18 - Mon, Nov 24

SEA

Seattle

ONT

Ontario

$114 Roundtrip, found 17 hours ago

$114

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Tue, Nov 18 from Seattle to Ontario, returning Mon, Nov 24, priced at $114 found 17 hours ago

Fri, Nov 21 - Tue, Nov 25

SEA

Seattle

ONT

Ontario

$123 Roundtrip, found 13 hours ago

$123

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Fri, Nov 21 from Seattle to Ontario, returning Tue, Nov 25, priced at $123 found 13 hours ago

Mon, Dec 15 - Mon, Dec 22

SEA

Seattle

ONT

Ontario

$124 Roundtrip, found 2 days ago

$124

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Mon, Dec 15 from Seattle to Ontario, returning Mon, Dec 22, priced at $124 found 2 days ago