$129 Cheap Frontier Airlines flights Seattle (SEA) to Ontario Intl. Airport (ONT)

$129 Cheap Frontier Airlines flights Seattle (SEA) to Ontario Intl. Airport (ONT)

Prices were available within the past 7 days and start at $129 for one-way flights and $118 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Jun 1 - Tue, Jun 9

SEA

Seattle

ONT

Ontario

$118 Roundtrip, found 4 days ago

$118

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Mon, Jun 1 from Seattle to Ontario, returning Tue, Jun 9, priced at $118 found 4 days ago

Mon, Jun 1 - Thu, Jun 4

SEA

Seattle

ONT

Ontario

$128 Roundtrip, found 4 days ago

$128

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Mon, Jun 1 from Seattle to Ontario, returning Thu, Jun 4, priced at $128 found 4 days ago

Mon, Jun 1 - Fri, Jun 5

SEA

Seattle

ONT

Ontario

$138 Roundtrip, found 4 days ago

$138

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Mon, Jun 1 from Seattle to Ontario, returning Fri, Jun 5, priced at $138 found 4 days ago

Mon, Jun 1 - Sun, Jun 7

SEA

Seattle

ONT

Ontario

$148 Roundtrip, found 4 days ago

$148

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Mon, Jun 1 from Seattle to Ontario, returning Sun, Jun 7, priced at $148 found 4 days ago

Fri, Jun 5 - Sun, Jun 7

SEA

Seattle

ONT

Ontario

$158 Roundtrip, found 4 days ago

$158

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Fri, Jun 5 from Seattle to Ontario, returning Sun, Jun 7, priced at $158 found 4 days ago

Mon, Jun 1 - Sat, Jun 20

SEA

Seattle

ONT

Ontario

$183 Roundtrip, found 4 days ago

$183

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Mon, Jun 1 from Seattle to Ontario, returning Sat, Jun 20, priced at $183 found 4 days ago

Sat, May 30 - Tue, Jun 9

SEA

Seattle

ONT

Ontario

$184 Roundtrip, found 4 days ago

$184

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Sat, May 30 from Seattle to Ontario, returning Tue, Jun 9, priced at $184 found 4 days ago

Mon, Jun 1 - Sat, Jun 6

SEA

Seattle

ONT

Ontario

$185 Roundtrip, found 4 days ago

$185

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Mon, Jun 1 from Seattle to Ontario, returning Sat, Jun 6, priced at $185 found 4 days ago

Mon, Jun 1 - Wed, Jun 17

SEA

Seattle

ONT

Ontario

$193 Roundtrip, found 4 days ago

$193

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Mon, Jun 1 from Seattle to Ontario, returning Wed, Jun 17, priced at $193 found 4 days ago