Flights from St. Louis to Washington

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.

Sun, Sep 14 - Sat, Sep 20

STL

Lambert-St. Louis Intl.

BWI

Baltimore Washington Intl. Thurgood Marshall

$156 Roundtrip, found 4 days ago

$156

Roundtrip

found 4 days ago

Select Spirit Airlines flight, departing Sun, Sep 14 from Lambert-St. Louis Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sat, Sep 20, priced at $156 found 4 days ago

Thu, Dec 4 - Tue, Dec 9

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$179 Roundtrip, found 8 hours ago

$179

Roundtrip

found 8 hours ago

Select American Airlines flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Dec 9, priced at $179 found 8 hours ago

Wed, Sep 17 - Sun, Sep 21

STL

Lambert-St. Louis Intl.

BWI

Baltimore Washington Intl. Thurgood Marshall

$189 Roundtrip, found 4 days ago

$189

Roundtrip

found 4 days ago

Select American Airlines flight, departing Wed, Sep 17 from Lambert-St. Louis Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Sun, Sep 21, priced at $189 found 4 days ago

Thu, Dec 4 - Tue, Dec 9

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$189 Roundtrip, found 8 hours ago

$189

Roundtrip

found 8 hours ago

Select American Airlines flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Dec 9, priced at $189 found 8 hours ago

Wed, Aug 6 - Sat, Aug 16

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$199 Roundtrip, found 2 hours ago

$199

Roundtrip

found 2 hours ago

Select Delta flight, departing Wed, Aug 6 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Sat, Aug 16, priced at $199 found 2 hours ago

Thu, Dec 4 - Tue, Dec 9

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$204 Roundtrip, found 8 hours ago

$204

Roundtrip

found 8 hours ago

Select American Airlines flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Dec 9, priced at $204 found 8 hours ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$214 Roundtrip, found 1 day ago

$214

Roundtrip

found 1 day ago

Select United flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $214 found 1 day ago

Thu, Dec 4 - Tue, Dec 9

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$216 Roundtrip, found 8 hours ago

$216

Roundtrip

found 8 hours ago

Select United flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Dec 9, priced at $216 found 8 hours ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$219 Roundtrip, found 1 day ago

$219

Roundtrip

found 1 day ago

Select Delta flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $219 found 1 day ago

Wed, Aug 6 - Fri, Aug 15

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$222 Roundtrip, found 2 hours ago

$222

Roundtrip

found 2 hours ago

Select Delta flight, departing Wed, Aug 6 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Fri, Aug 15, priced at $222 found 2 hours ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$224 Roundtrip, found 1 day ago

$224

Roundtrip

found 1 day ago

Select United flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $224 found 1 day ago

Thu, Dec 4 - Tue, Dec 9

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$224 Roundtrip, found 8 hours ago

$224

Roundtrip

found 8 hours ago

Select American Airlines flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Dec 9, priced at $224 found 8 hours ago

Thu, Dec 4 - Tue, Dec 9

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$226 Roundtrip, found 8 hours ago

$226

Roundtrip

found 8 hours ago

Select United flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Dec 9, priced at $226 found 8 hours ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

IAD

Washington Dulles Intl.

$229 Roundtrip, found 1 day ago

$229

Roundtrip

found 1 day ago

Select Delta flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Washington Dulles Intl., returning Mon, Dec 8, priced at $229 found 1 day ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$229 Roundtrip, found 1 day ago

$229

Roundtrip

found 1 day ago

Select Delta flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $229 found 1 day ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

BWI

Baltimore Washington Intl. Thurgood Marshall

$233 Roundtrip, found 1 day ago

$233

Roundtrip

found 1 day ago

Select American Airlines flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Baltimore Washington Intl. Thurgood Marshall, returning Mon, Dec 8, priced at $233 found 1 day ago

Thu, Dec 4 - Tue, Dec 9

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$234 Roundtrip, found 8 hours ago

$234

Roundtrip

found 8 hours ago

Select American Airlines flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Dec 9, priced at $234 found 8 hours ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$235 Roundtrip, found 1 day ago

$235

Roundtrip

found 1 day ago

Select United flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $235 found 1 day ago

Thu, Dec 4 - Tue, Dec 9

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$239 Roundtrip, found 8 hours ago

$239

Roundtrip

found 8 hours ago

Select Delta flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Dec 9, priced at $239 found 8 hours ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$274 Roundtrip, found 2 hours ago

$274

Roundtrip

found 2 hours ago

Select Frontier Airlines flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $274 found 2 hours ago