Flights from Mount Vernon to St. Louis

Cheapest flights from Mount Vernon

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.

Sat, Sep 13 - Tue, Sep 16

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$189 Roundtrip, found 1 hour ago

$189

Roundtrip

found 1 hour ago

Select Delta flight, departing Sat, Sep 13 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Tue, Sep 16, priced at $189 found 1 hour ago

Fri, Jul 11 - Mon, Jul 21

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$209 Roundtrip, found 23 hours ago

$209

Roundtrip

found 23 hours ago

Select Delta flight, departing Fri, Jul 11 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Mon, Jul 21, priced at $209 found 23 hours ago

Tue, Sep 9 - Fri, Sep 12

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$229 Roundtrip, found 1 hour ago

$229

Roundtrip

found 1 hour ago

Select Delta flight, departing Tue, Sep 9 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Fri, Sep 12, priced at $229 found 1 hour ago

Fri, Sep 12 - Mon, Sep 15

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$239 Roundtrip, found 1 hour ago

$239

Roundtrip

found 1 hour ago

Select Alaska Airlines flight, departing Fri, Sep 12 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Mon, Sep 15, priced at $239 found 1 hour ago

Fri, Sep 12 - Mon, Sep 15

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$243 Roundtrip, found 1 hour ago

$243

Roundtrip

found 1 hour ago

Select United flight, departing Fri, Sep 12 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Mon, Sep 15, priced at $243 found 1 hour ago

Sun, Sep 14 - Sun, Sep 14

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$244 Roundtrip, found 1 hour ago

$244

Roundtrip

found 1 hour ago

Select Hawaiian Airlines flight, departing Sun, Sep 14 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Sun, Sep 14, priced at $244 found 1 hour ago

Fri, Jul 11 - Sun, Jul 20

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$249 Roundtrip, found 23 hours ago

$249

Roundtrip

found 23 hours ago

Select Delta flight, departing Fri, Jul 11 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Sun, Jul 20, priced at $249 found 23 hours ago

Fri, Sep 12 - Mon, Sep 15

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$249 Roundtrip, found 1 hour ago

$249

Roundtrip

found 1 hour ago

Select Alaska Airlines flight, departing Fri, Sep 12 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Mon, Sep 15, priced at $249 found 1 hour ago

Fri, Sep 12 - Mon, Sep 15

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$254 Roundtrip, found 1 hour ago

$254

Roundtrip

found 1 hour ago

Select American Airlines flight, departing Fri, Sep 12 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Mon, Sep 15, priced at $254 found 1 hour ago

Fri, Sep 12 - Mon, Sep 15

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$261 Roundtrip, found 1 hour ago

$261

Roundtrip

found 1 hour ago

Select United flight, departing Fri, Sep 12 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Mon, Sep 15, priced at $261 found 1 hour ago

Thu, Sep 11 - Fri, Sep 12

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$263 Roundtrip, found 1 hour ago

$263

Roundtrip

found 1 hour ago

Select Delta flight, departing Thu, Sep 11 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Fri, Sep 12, priced at $263 found 1 hour ago

Fri, Sep 12 - Fri, Sep 12

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$264 Roundtrip, found 1 hour ago

$264

Roundtrip

found 1 hour ago

Select Hawaiian Airlines flight, departing Fri, Sep 12 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Fri, Sep 12, priced at $264 found 1 hour ago

Fri, Sep 12 - Mon, Sep 15

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$265 Roundtrip, found 1 hour ago

$265

Roundtrip

found 1 hour ago

Select United flight, departing Fri, Sep 12 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Mon, Sep 15, priced at $265 found 1 hour ago

Mon, Sep 15 - Thu, Sep 18

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$269 Roundtrip, found 1 hour ago

$269

Roundtrip

found 1 hour ago

Select Hawaiian Airlines flight, departing Mon, Sep 15 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Thu, Sep 18, priced at $269 found 1 hour ago

Fri, Sep 12 - Mon, Sep 15

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$273 Roundtrip, found 1 hour ago

$273

Roundtrip

found 1 hour ago

Select Delta flight, departing Fri, Sep 12 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Mon, Sep 15, priced at $273 found 1 hour ago

Fri, Sep 12 - Mon, Sep 15

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$275 Roundtrip, found 1 hour ago

$275

Roundtrip

found 1 hour ago

Select United flight, departing Fri, Sep 12 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Mon, Sep 15, priced at $275 found 1 hour ago

Fri, Sep 12 - Mon, Sep 15

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$278 Roundtrip, found 1 hour ago

$278

Roundtrip

found 1 hour ago

Select American Airlines flight, departing Fri, Sep 12 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Mon, Sep 15, priced at $278 found 1 hour ago

Fri, Sep 12 - Mon, Sep 15

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$279 Roundtrip, found 1 hour ago

$279

Roundtrip

found 1 hour ago

Select American Airlines flight, departing Fri, Sep 12 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Mon, Sep 15, priced at $279 found 1 hour ago

Fri, Sep 12 - Mon, Sep 15

SEA

Seattle - Tacoma Intl.

STL

Lambert-St. Louis Intl.

$311 Roundtrip, found 1 hour ago

$311

Roundtrip

found 1 hour ago

Select Frontier Airlines flight, departing Fri, Sep 12 from Seattle - Tacoma Intl. to Lambert-St. Louis Intl., returning Mon, Sep 15, priced at $311 found 1 hour ago

Fri, Jul 11 - Sun, Jul 20

PAE

Seattle Paine Field Intl. Airport

STL

Lambert-St. Louis Intl.

$614 Roundtrip, found 23 hours ago

$614

Roundtrip

found 23 hours ago

Select Alaska Airlines flight, departing Fri, Jul 11 from Seattle Paine Field Intl. Airport to Lambert-St. Louis Intl., returning Sun, Jul 20, priced at $614 found 23 hours ago