$77 Cheap Frontier Airlines flights Seattle (SEA) to Ontario (ONT)

$77 Cheap Frontier Airlines flights Seattle (SEA) to Ontario (ONT)

Prices were available within the past 7 days and start at $77 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 4 days ago

$154

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Wed, Oct 1 from Seattle to Ontario, returning Thu, Oct 9, priced at $154 found 4 days ago

Tue, Nov 18 - Tue, Nov 25

SEA

Seattle

ONT

Ontario

$156 Roundtrip, found 1 day ago

$156

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Nov 18 from Seattle to Ontario, returning Tue, Nov 25, priced at $156 found 1 day ago

Tue, Sep 30 - Thu, Oct 9

SEA

Seattle

ONT

Ontario

$159 Roundtrip, found 4 days ago

$159

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Tue, Sep 30 from Seattle to Ontario, returning Thu, Oct 9, priced at $159 found 4 days ago

Wed, Nov 5 - Tue, Nov 18

SEA

Seattle

ONT

Ontario

$166 Roundtrip, found 13 hours ago

$166

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Wed, Nov 5 from Seattle to Ontario, returning Tue, Nov 18, priced at $166 found 13 hours ago

Mon, Oct 27 - Sun, Nov 2

SEA

Seattle

ONT

Ontario

$168 Roundtrip, found 1 day ago

$168

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Oct 27 from Seattle to Ontario, returning Sun, Nov 2, priced at $168 found 1 day ago

Thu, Oct 2 - Mon, Oct 6

SEA

Seattle

ONT

Ontario

$169 Roundtrip, found 4 days ago

$169

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Thu, Oct 2 from Seattle to Ontario, returning Mon, Oct 6, priced at $169 found 4 days ago