Flights from St. Louis to Seattle

Cheapest flights from St. Louis

These prices were available within the past 7 days. Prices quoted are per person, round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Aug 1 - Fri, Aug 8

STL

Lambert-St. Louis Intl.

SEA

Seattle - Tacoma Intl.

$308 Roundtrip, found 17 hours ago

$308

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Fri, Aug 1 from Lambert-St. Louis Intl. to Seattle - Tacoma Intl., returning Fri, Aug 8, priced at $308 found 17 hours ago

Fri, Aug 1 - Tue, Aug 5

STL

Lambert-St. Louis Intl.

SEA

Seattle - Tacoma Intl.

$348 Roundtrip, found 17 hours ago

$348

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Fri, Aug 1 from Lambert-St. Louis Intl. to Seattle - Tacoma Intl., returning Tue, Aug 5, priced at $348 found 17 hours ago

Mon, Jul 28 - Fri, Aug 8

STL

Lambert-St. Louis Intl.

SEA

Seattle - Tacoma Intl.

$358 Roundtrip, found 17 hours ago

$358

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Mon, Jul 28 from Lambert-St. Louis Intl. to Seattle - Tacoma Intl., returning Fri, Aug 8, priced at $358 found 17 hours ago

Fri, Aug 1 - Sun, Aug 3

STL

Lambert-St. Louis Intl.

SEA

Seattle - Tacoma Intl.

$398 Roundtrip, found 17 hours ago

$398

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Fri, Aug 1 from Lambert-St. Louis Intl. to Seattle - Tacoma Intl., returning Sun, Aug 3, priced at $398 found 17 hours ago

Mon, Jul 28 - Sun, Aug 3

STL

Lambert-St. Louis Intl.

SEA

Seattle - Tacoma Intl.

$448 Roundtrip, found 17 hours ago

$448

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Mon, Jul 28 from Lambert-St. Louis Intl. to Seattle - Tacoma Intl., returning Sun, Aug 3, priced at $448 found 17 hours ago

Wed, Jul 30 - Fri, Aug 8

STL

Lambert-St. Louis Intl.

SEA

Seattle - Tacoma Intl.

$457 Roundtrip, found 17 hours ago

$457

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Wed, Jul 30 from Lambert-St. Louis Intl. to Seattle - Tacoma Intl., returning Fri, Aug 8, priced at $457 found 17 hours ago

Wed, Jul 30 - Tue, Aug 5

STL

Lambert-St. Louis Intl.

SEA

Seattle - Tacoma Intl.

$492 Roundtrip, found 17 hours ago

$492

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Wed, Jul 30 from Lambert-St. Louis Intl. to Seattle - Tacoma Intl., returning Tue, Aug 5, priced at $492 found 17 hours ago

Wed, Jul 30 - Thu, Aug 7

STL

Lambert-St. Louis Intl.

SEA

Seattle - Tacoma Intl.

$497 Roundtrip, found 17 hours ago

$497

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Wed, Jul 30 from Lambert-St. Louis Intl. to Seattle - Tacoma Intl., returning Thu, Aug 7, priced at $497 found 17 hours ago

Tue, Jul 29 - Wed, Aug 6

STL

Lambert-St. Louis Intl.

SEA

Seattle - Tacoma Intl.

$499 Roundtrip, found 17 hours ago

$499

Roundtrip

found 17 hours ago

Select Delta flight, departing Tue, Jul 29 from Lambert-St. Louis Intl. to Seattle - Tacoma Intl., returning Wed, Aug 6, priced at $499 found 17 hours ago

Tue, Jul 29 - Thu, Aug 7

STL

Lambert-St. Louis Intl.

SEA

Seattle - Tacoma Intl.

$548 Roundtrip, found 17 hours ago

$548

Roundtrip

found 17 hours ago

Select Delta flight, departing Tue, Jul 29 from Lambert-St. Louis Intl. to Seattle - Tacoma Intl., returning Thu, Aug 7, priced at $548 found 17 hours ago

Wed, Jul 30 - Sun, Aug 3

STL

Lambert-St. Louis Intl.

SEA

Seattle - Tacoma Intl.

$558 Roundtrip, found 17 hours ago

$558

Roundtrip

found 17 hours ago

Select Frontier Airlines flight, departing Wed, Jul 30 from Lambert-St. Louis Intl. to Seattle - Tacoma Intl., returning Sun, Aug 3, priced at $558 found 17 hours ago

Tue, Jul 29 - Tue, Aug 5

STL

Lambert-St. Louis Intl.

SEA

Seattle - Tacoma Intl.

$589 Roundtrip, found 17 hours ago

$589

Roundtrip

found 17 hours ago

Select American Airlines flight, departing Tue, Jul 29 from Lambert-St. Louis Intl. to Seattle - Tacoma Intl., returning Tue, Aug 5, priced at $589 found 17 hours ago

Thu, Jul 31 - Wed, Aug 6

STL

Lambert-St. Louis Intl.

SEA

Seattle - Tacoma Intl.

$619 Roundtrip, found 17 hours ago

$619

Roundtrip

found 17 hours ago

Select Delta flight, departing Thu, Jul 31 from Lambert-St. Louis Intl. to Seattle - Tacoma Intl., returning Wed, Aug 6, priced at $619 found 17 hours ago