$136 Cheap Frontier Airlines flights St. Louis (STL) to Seattle (SEA)

$136 Cheap Frontier Airlines flights St. Louis (STL) to Seattle (SEA)

Prices were available within the past 7 days and start at $136 for one-way flights and $220 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sun, Jun 7 - Tue, Jun 16

STL

St. Louis

SEA

Seattle

$220 Roundtrip, found 18 hours ago

$220

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Sun, Jun 7 from St. Louis to Seattle, returning Tue, Jun 16, priced at $220 found 18 hours ago

Sun, Jun 7 - Mon, Jun 15

STL

St. Louis

SEA

Seattle

$240 Roundtrip, found 18 hours ago

$240

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Sun, Jun 7 from St. Louis to Seattle, returning Mon, Jun 15, priced at $240 found 18 hours ago

Sun, Jun 7 - Fri, Jun 12

STL

St. Louis

SEA

Seattle

$260 Roundtrip, found 18 hours ago

$260

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Sun, Jun 7 from St. Louis to Seattle, returning Fri, Jun 12, priced at $260 found 18 hours ago

Mon, Jul 27 - Tue, Aug 4

STL

St. Louis

SEA

Seattle

$280 Roundtrip, found 13 hours ago

$280

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Mon, Jul 27 from St. Louis to Seattle, returning Tue, Aug 4, priced at $280 found 13 hours ago

Thu, Jul 23 - Tue, Aug 4

STL

St. Louis

SEA

Seattle

$300 Roundtrip, found 13 hours ago

$300

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Thu, Jul 23 from St. Louis to Seattle, returning Tue, Aug 4, priced at $300 found 13 hours ago

Fri, Jun 5 - Tue, Jun 16

STL

St. Louis

SEA

Seattle

$316 Roundtrip, found 18 hours ago

$316

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Fri, Jun 5 from St. Louis to Seattle, returning Tue, Jun 16, priced at $316 found 18 hours ago

Sun, Jun 7 - Sun, Jun 14

STL

St. Louis

SEA

Seattle

$325 Roundtrip, found 18 hours ago

$325

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Sun, Jun 7 from St. Louis to Seattle, returning Sun, Jun 14, priced at $325 found 18 hours ago

Fri, Jun 5 - Mon, Jun 15

STL

St. Louis

SEA

Seattle

$336 Roundtrip, found 18 hours ago

$336

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Fri, Jun 5 from St. Louis to Seattle, returning Mon, Jun 15, priced at $336 found 18 hours ago

Tue, Jul 28 - Thu, Aug 6

STL

St. Louis

SEA

Seattle

$345 Roundtrip, found 13 hours ago

$345

Roundtrip

found 13 hours ago

Select Frontier Airlines flight, departing Tue, Jul 28 from St. Louis to Seattle, returning Thu, Aug 6, priced at $345 found 13 hours ago

Fri, Jun 5 - Wed, Jun 17

STL

St. Louis

SEA

Seattle

$356 Roundtrip, found 18 hours ago

$356

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Fri, Jun 5 from St. Louis to Seattle, returning Wed, Jun 17, priced at $356 found 18 hours ago