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

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

Prices were available within the past 7 days and start at for one-way flights and $290 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Jun 22 - Wed, Jun 24

SEA

Seattle

STL

St. Louis

$290 Roundtrip, found 5 days ago

$290

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Mon, Jun 22 from Seattle to St. Louis, returning Wed, Jun 24, priced at $290 found 5 days ago

Wed, Jul 15 - Sat, Jul 25

SEA

Seattle

STL

St. Louis

$294 Roundtrip, found 1 day ago

$294

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Jul 15 from Seattle to St. Louis, returning Sat, Jul 25, priced at $294 found 1 day ago

Wed, Jul 15 - Mon, Jul 27

SEA

Seattle

STL

St. Louis

$299 Roundtrip, found 1 day ago

$299

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Jul 15 from Seattle to St. Louis, returning Mon, Jul 27, priced at $299 found 1 day ago

Wed, Jul 15 - Sun, Jul 26

SEA

Seattle

STL

St. Louis

$300 Roundtrip, found 1 day ago

$300

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Wed, Jul 15 from Seattle to St. Louis, returning Sun, Jul 26, priced at $300 found 1 day ago

Wed, Jun 24 - Tue, Jun 30

SEA

Seattle

STL

St. Louis

$310 Roundtrip, found 5 days ago

$310

Roundtrip

found 5 days ago

Select Frontier Airlines flight, departing Wed, Jun 24 from Seattle to St. Louis, returning Tue, Jun 30, priced at $310 found 5 days ago

Mon, Jul 20 - Sat, Jul 25

SEA

Seattle

STL

St. Louis

$313 Roundtrip, found 1 day ago

$313

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Jul 20 from Seattle to St. Louis, returning Sat, Jul 25, priced at $313 found 1 day ago

Fri, Jul 17 - Sat, Jul 25

SEA

Seattle

STL

St. Louis

$314 Roundtrip, found 1 day ago

$314

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Jul 17 from Seattle to St. Louis, returning Sat, Jul 25, priced at $314 found 1 day ago

Mon, Jul 20 - Mon, Jul 27

SEA

Seattle

STL

St. Louis

$318 Roundtrip, found 1 day ago

$318

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Jul 20 from Seattle to St. Louis, returning Mon, Jul 27, priced at $318 found 1 day ago

Mon, Jul 20 - Sun, Jul 26

SEA

Seattle

STL

St. Louis

$319 Roundtrip, found 1 day ago

$319

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Jul 20 from Seattle to St. Louis, returning Sun, Jul 26, priced at $319 found 1 day ago

Fri, Jul 17 - Sun, Jul 26

SEA

Seattle

STL

St. Louis

$320 Roundtrip, found 1 day ago

$320

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Fri, Jul 17 from Seattle to St. Louis, returning Sun, Jul 26, priced at $320 found 1 day ago

Thu, Jul 16 - Sat, Jul 25

SEA

Seattle

STL

St. Louis

$334 Roundtrip, found 1 day ago

$334

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Thu, Jul 16 from Seattle to St. Louis, returning Sat, Jul 25, priced at $334 found 1 day ago

Mon, Jul 20 - Tue, Jul 21

SEA

Seattle

STL

St. Louis

$339 Roundtrip, found 1 day ago

$339

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Mon, Jul 20 from Seattle to St. Louis, returning Tue, Jul 21, priced at $339 found 1 day ago