$49 Cheap Frontier Airlines flights Seattle (SEA) to Ontario (ONT)

$49 Cheap Frontier Airlines flights Seattle (SEA) to Ontario (ONT)

Prices were available within the past 7 days and start at $49 for one-way flights and $98 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, May 24 - Tue, May 27

SEA

Seattle

ONT

Ontario

$98 Roundtrip, found 5 days ago

$98

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Sat, May 24 from Seattle to Ontario, returning Tue, May 27, priced at $98 found 5 days ago

Sat, May 24 - Wed, May 28

SEA

Seattle

ONT

Ontario

$100 Roundtrip, found 5 days ago

$100

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Sat, May 24 from Seattle to Ontario, returning Wed, May 28, priced at $100 found 5 days ago

Sat, Jun 14 - Tue, Jun 17

SEA

Seattle

ONT

Ontario

$108 Roundtrip, found 3 days ago

$108

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sat, Jun 14 from Seattle to Ontario, returning Tue, Jun 17, priced at $108 found 3 days ago

Sun, May 18 - Sat, May 24

SEA

Seattle

ONT

Ontario

$110 Roundtrip, found 3 days ago

$110

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sun, May 18 from Seattle to Ontario, returning Sat, May 24, priced at $110 found 3 days ago

Sat, Jun 14 - Sat, Jun 21

SEA

Seattle

ONT

Ontario

$118 Roundtrip, found 3 days ago

$118

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sat, Jun 14 from Seattle to Ontario, returning Sat, Jun 21, priced at $118 found 3 days ago

Mon, Jun 16 - Sat, Jun 21

SEA

Seattle

ONT

Ontario

$128 Roundtrip, found 3 days ago

$128

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Mon, Jun 16 from Seattle to Ontario, returning Sat, Jun 21, priced at $128 found 3 days ago