Cheap Frontier Airlines flights St. Louis (STL) to Seattle (SEA)

Cheap Frontier Airlines flights St. Louis (STL) to Seattle (SEA)

Prices were available within the past 7 days and start at for one-way flights and $280 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Jun 9 - Wed, Jun 10

STL

St. Louis

SEA

Seattle

$280 Roundtrip, found 6 days ago

$280

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Tue, Jun 9 from St. Louis to Seattle, returning Wed, Jun 10, priced at $280 found 6 days ago

Wed, Jul 1 - Thu, Jul 2

STL

St. Louis

SEA

Seattle

$299 Roundtrip, found 5 days ago

$299

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Wed, Jul 1 from St. Louis to Seattle, returning Thu, Jul 2, priced at $299 found 5 days ago

Wed, Jul 1 - Fri, Jul 3

STL

St. Louis

SEA

Seattle

$300 Roundtrip, found 5 days ago

$300

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Wed, Jul 1 from St. Louis to Seattle, returning Fri, Jul 3, priced at $300 found 5 days ago

Mon, Aug 17 - Mon, Aug 24

STL

St. Louis

SEA

Seattle

$308 Roundtrip, found 4 days ago

$308

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Mon, Aug 17 from St. Louis to Seattle, returning Mon, Aug 24, priced at $308 found 4 days ago

Mon, Jun 8 - Thu, Jun 11

STL

St. Louis

SEA

Seattle

$313 Roundtrip, found 6 days ago

$313

Roundtrip

found 6 days ago

Select Frontier Airlines flight, departing Mon, Jun 8 from St. Louis to Seattle, returning Thu, Jun 11, priced at $313 found 6 days ago

Mon, Aug 17 - Fri, Aug 21

STL

St. Louis

SEA

Seattle

$314 Roundtrip, found 4 days ago

$314

Roundtrip

found 4 days ago

Select Frontier Airlines flight, departing Mon, Aug 17 from St. Louis to Seattle, returning Fri, Aug 21, priced at $314 found 4 days ago

Mon, Jul 13 - Mon, Jul 20

STL

St. Louis

SEA

Seattle

$318 Roundtrip, found 5 days ago

$318

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Mon, Jul 13 from St. Louis to Seattle, returning Mon, Jul 20, priced at $318 found 5 days ago

Thu, Jul 2 - Fri, Jul 3

STL

St. Louis

SEA

Seattle

$319 Roundtrip, found 5 days ago

$319

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Thu, Jul 2 from St. Louis to Seattle, returning Fri, Jul 3, priced at $319 found 5 days ago

Wed, Jun 3 - Sun, Jun 7

STL

St. Louis

SEA

Seattle

$320 Roundtrip, found 5 days ago

$320

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Wed, Jun 3 from St. Louis to Seattle, returning Sun, Jun 7, priced at $320 found 5 days ago

Mon, Aug 17 - Tue, Aug 25

STL

St. Louis

SEA

Seattle

$334 Roundtrip, found 13 hours ago

$334

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Mon, Aug 17 from St. Louis to Seattle, returning Tue, Aug 25, priced at $334 found 13 hours ago

Thu, Jul 2 - Sun, Jul 5

STL

St. Louis

SEA

Seattle

$339 Roundtrip, found 5 days ago

$339

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Thu, Jul 2 from St. Louis to Seattle, returning Sun, Jul 5, priced at $339 found 5 days ago

Sun, Sep 13 - Wed, Sep 23

STL

St. Louis

SEA

Seattle

$340 Roundtrip, found 3 days ago

$340

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sun, Sep 13 from St. Louis to Seattle, returning Wed, Sep 23, priced at $340 found 3 days ago