$74 Cheap Frontier Airlines flights Seattle (SEA) to Ontario (ONT)

$74 Cheap Frontier Airlines flights Seattle (SEA) to Ontario (ONT)

Prices were available within the past 7 days and start at $74 for one-way flights and $126 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Aug 14 - Tue, Aug 19

SEA

Seattle

ONT

Ontario

$126 Roundtrip, found 6 days ago

$126

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Thu, Aug 14 from Seattle to Ontario, returning Tue, Aug 19, priced at $126 found 6 days ago

Thu, Aug 14 - Thu, Aug 21

SEA

Seattle

ONT

Ontario

$131 Roundtrip, found 6 days ago

$131

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Thu, Aug 14 from Seattle to Ontario, returning Thu, Aug 21, priced at $131 found 6 days ago

Thu, Aug 14 - Sun, Aug 17

SEA

Seattle

ONT

Ontario

$140 Roundtrip, found 6 days ago

$140

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Thu, Aug 14 from Seattle to Ontario, returning Sun, Aug 17, priced at $140 found 6 days ago

Thu, Aug 14 - Fri, Aug 22

SEA

Seattle

ONT

Ontario

$156 Roundtrip, found 6 days ago

$156

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Thu, Aug 14 from Seattle to Ontario, returning Fri, Aug 22, priced at $156 found 6 days ago

Tue, Aug 12 - Tue, Aug 19

SEA

Seattle

ONT

Ontario

$196 Roundtrip, found 6 days ago

$196

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Tue, Aug 12 from Seattle to Ontario, returning Tue, Aug 19, priced at $196 found 6 days ago

Tue, Aug 12 - Wed, Aug 13

SEA

Seattle

ONT

Ontario

$198 Roundtrip, found 6 days ago

$198

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Tue, Aug 12 from Seattle to Ontario, returning Wed, Aug 13, priced at $198 found 6 days ago

Tue, Aug 19 - Sat, Aug 30

SEA

Seattle

ONT

Ontario

$200 Roundtrip, found 2 hours ago

$200

Roundtrip

found 2 hours ago

Select Frontier Airlines flight, departing Tue, Aug 19 from Seattle to Ontario, returning Sat, Aug 30, priced at $200 found 2 hours ago

Tue, Aug 19 - Thu, Aug 28

SEA

Seattle

ONT

Ontario

$202 Roundtrip, found 2 hours ago

$202

Roundtrip

found 2 hours ago

Select Frontier Airlines flight, departing Tue, Aug 19 from Seattle to Ontario, returning Thu, Aug 28, priced at $202 found 2 hours ago

Thu, Aug 21 - Thu, Aug 28

SEA

Seattle

ONT

Ontario

$204 Roundtrip, found 2 hours ago

$204

Roundtrip

found 2 hours ago

Select Frontier Airlines flight, departing Thu, Aug 21 from Seattle to Ontario, returning Thu, Aug 28, priced at $204 found 2 hours ago