$83 Cheap Frontier Airlines flights Seattle (SEA) to Ontario (ONT)

$83 Cheap Frontier Airlines flights Seattle (SEA) to Ontario (ONT)

Prices were available within the past 7 days and start at $83 for one-way flights and $154 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Oct 1 - Thu, Oct 9

SEA

Seattle

ONT

Ontario

$154 Roundtrip, found 1 day ago

$154

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Oct 1 from Seattle to Ontario, returning Thu, Oct 9, priced at $154 found 1 day ago

Tue, Sep 30 - Thu, Oct 9

SEA

Seattle

ONT

Ontario

$159 Roundtrip, found 1 day ago

$159

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Sep 30 from Seattle to Ontario, returning Thu, Oct 9, priced at $159 found 1 day ago

Thu, Oct 2 - Mon, Oct 6

SEA

Seattle

ONT

Ontario

$169 Roundtrip, found 1 day ago

$169

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Oct 2 from Seattle to Ontario, returning Mon, Oct 6, priced at $169 found 1 day ago

Wed, Oct 1 - Wed, Oct 8

SEA

Seattle

ONT

Ontario

$176 Roundtrip, found 1 day ago

$176

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Oct 1 from Seattle to Ontario, returning Wed, Oct 8, priced at $176 found 1 day ago

Tue, Oct 14 - Sat, Oct 18

SEA

Seattle

ONT

Ontario

$181 Roundtrip, found 2 days ago

$181

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Tue, Oct 14 from Seattle to Ontario, returning Sat, Oct 18, priced at $181 found 2 days ago

Tue, Sep 30 - Sun, Oct 5

SEA

Seattle

ONT

Ontario

$192 Roundtrip, found 1 day ago

$192

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Sep 30 from Seattle to Ontario, returning Sun, Oct 5, priced at $192 found 1 day ago

Thu, Oct 2 - Thu, Oct 9

SEA

Seattle

ONT

Ontario

$198 Roundtrip, found 1 day ago

$198

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Oct 2 from Seattle to Ontario, returning Thu, Oct 9, priced at $198 found 1 day ago

Tue, Oct 14 - Sat, Oct 18

SEA

Seattle

ONT

Ontario

$205 Roundtrip, found 2 days ago

$205

Roundtrip

found 2 days ago

Select Frontier Airlines flight, departing Tue, Oct 14 from Seattle to Ontario, returning Sat, Oct 18, priced at $205 found 2 days ago

Mon, Sep 29 - Wed, Oct 8

SEA

Seattle

ONT

Ontario

$209 Roundtrip, found 1 day ago

$209

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Sep 29 from Seattle to Ontario, returning Wed, Oct 8, priced at $209 found 1 day ago