$92 Cheap Frontier Airlines flights Seattle (SEA) to Ontario (ONT)

$92 Cheap Frontier Airlines flights Seattle (SEA) to Ontario (ONT)

Prices were available within the past 7 days and start at $92 for one-way flights and $121 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Jan 6 - Sun, Jan 11

SEA

Seattle

ONT

Ontario

$121 Roundtrip, found 3 days ago

$121

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Tue, Jan 6 from Seattle to Ontario, returning Sun, Jan 11, priced at $121 found 3 days ago

Tue, Feb 17 - Wed, Feb 18

SEA

Seattle

ONT

Ontario

$155 Roundtrip, found 1 day ago

$155

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Feb 17 from Seattle to Ontario, returning Wed, Feb 18, priced at $155 found 1 day ago

Tue, Feb 17 - Thu, Feb 19

SEA

Seattle

ONT

Ontario

$172 Roundtrip, found 1 day ago

$172

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Feb 17 from Seattle to Ontario, returning Thu, Feb 19, priced at $172 found 1 day ago

Tue, Feb 17 - Sun, Feb 22

SEA

Seattle

ONT

Ontario

$207 Roundtrip, found 1 day ago

$207

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Feb 17 from Seattle to Ontario, returning Sun, Feb 22, priced at $207 found 1 day ago

Sat, Feb 14 - Sat, Feb 21

SEA

Seattle

ONT

Ontario

$215 Roundtrip, found 1 day ago

$215

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Sat, Feb 14 from Seattle to Ontario, returning Sat, Feb 21, priced at $215 found 1 day ago

Thu, Feb 12 - Sat, Feb 21

SEA

Seattle

ONT

Ontario

$235 Roundtrip, found 1 day ago

$235

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Feb 12 from Seattle to Ontario, returning Sat, Feb 21, priced at $235 found 1 day ago

Thu, Feb 12 - Mon, Feb 23

SEA

Seattle

ONT

Ontario

$252 Roundtrip, found 1 day ago

$252

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Feb 12 from Seattle to Ontario, returning Mon, Feb 23, priced at $252 found 1 day ago