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.

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$179 Roundtrip, found 2 days ago

$179

Roundtrip

found 2 days ago

Select American Airlines flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $179 found 2 days ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$189 Roundtrip, found 2 days ago

$189

Roundtrip

found 2 days ago

Select Delta flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $189 found 2 days ago

Wed, Oct 8 - Tue, Oct 14

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$199 Roundtrip, found 1 day ago

$199

Roundtrip

found 1 day ago

Select Delta flight, departing Wed, Oct 8 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Oct 14, priced at $199 found 1 day ago

Fri, Dec 5 - Sat, Dec 6

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$209 Roundtrip, found 2 days ago

$209

Roundtrip

found 2 days ago

Select Delta flight, departing Fri, Dec 5 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Sat, Dec 6, priced at $209 found 2 days ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$219 Roundtrip, found 2 days ago

$219

Roundtrip

found 2 days ago

Select United flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $219 found 2 days ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$224 Roundtrip, found 2 days ago

$224

Roundtrip

found 2 days ago

Select American Airlines flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $224 found 2 days ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$229 Roundtrip, found 2 days ago

$229

Roundtrip

found 2 days ago

Select United flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $229 found 2 days ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$234 Roundtrip, found 2 days ago

$234

Roundtrip

found 2 days ago

Select American Airlines flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $234 found 2 days ago

Fri, Oct 10 - Mon, Oct 13

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$234 Roundtrip, found 1 day ago

$234

Roundtrip

found 1 day ago

Select American Airlines flight, departing Fri, Oct 10 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Oct 13, priced at $234 found 1 day ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$239 Roundtrip, found 2 days ago

$239

Roundtrip

found 2 days ago

Select Delta flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $239 found 2 days ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$246 Roundtrip, found 2 days ago

$246

Roundtrip

found 2 days ago

Select United flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $246 found 2 days ago

Wed, Oct 8 - Mon, Oct 13

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$249 Roundtrip, found 1 day ago

$249

Roundtrip

found 1 day ago

Select Delta flight, departing Wed, Oct 8 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Oct 13, priced at $249 found 1 day ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$254 Roundtrip, found 2 days ago

$254

Roundtrip

found 2 days ago

Select United flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $254 found 2 days ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$255 Roundtrip, found 2 days ago

$255

Roundtrip

found 2 days ago

Select United flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $255 found 2 days ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$257 Roundtrip, found 2 days ago

$257

Roundtrip

found 2 days ago

Select American Airlines flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $257 found 2 days ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$258 Roundtrip, found 2 days ago

$258

Roundtrip

found 2 days ago

Select United flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $258 found 2 days ago

Fri, Oct 10 - Tue, Oct 14

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$259 Roundtrip, found 1 day ago

$259

Roundtrip

found 1 day ago

Select American Airlines flight, departing Fri, Oct 10 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Oct 14, priced at $259 found 1 day ago

Fri, Oct 10 - Mon, Oct 13

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$265 Roundtrip, found 1 day ago

$265

Roundtrip

found 1 day ago

Select American Airlines flight, departing Fri, Oct 10 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Oct 13, priced at $265 found 1 day ago

Thu, Dec 4 - Mon, Dec 8

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$267 Roundtrip, found 2 days ago

$267

Roundtrip

found 2 days ago

Select Delta flight, departing Thu, Dec 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Mon, Dec 8, priced at $267 found 2 days ago

Tue, Oct 7 - Sun, Oct 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$274 Roundtrip, found 1 day ago

$274

Roundtrip

found 1 day ago

Select Frontier Airlines flight, departing Tue, Oct 7 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Sun, Oct 12, priced at $274 found 1 day ago