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.

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$151 Roundtrip, found 2 hours ago

$151

Roundtrip

found 2 hours ago

Select American Airlines flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $151 found 2 hours ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$167 Roundtrip, found 2 hours ago

$167

Roundtrip

found 2 hours ago

Select American Airlines flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $167 found 2 hours ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$177 Roundtrip, found 2 hours ago

$177

Roundtrip

found 2 hours ago

Select Delta flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $177 found 2 hours ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$185 Roundtrip, found 2 hours ago

$185

Roundtrip

found 2 hours ago

Select American Airlines flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $185 found 2 hours ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$197 Roundtrip, found 2 hours ago

$197

Roundtrip

found 2 hours ago

Select Delta flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $197 found 2 hours ago

Tue, Aug 5 - Fri, Aug 15

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$201 Roundtrip, found 3 days ago

$201

Roundtrip

found 3 days ago

Select Delta flight, departing Tue, Aug 5 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Fri, Aug 15, priced at $201 found 3 days ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$202 Roundtrip, found 2 hours ago

$202

Roundtrip

found 2 hours ago

Select American Airlines flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $202 found 2 hours ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$204 Roundtrip, found 2 hours ago

$204

Roundtrip

found 2 hours ago

Select American Airlines flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $204 found 2 hours ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$212 Roundtrip, found 2 hours ago

$212

Roundtrip

found 2 hours ago

Select Delta flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $212 found 2 hours ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$213 Roundtrip, found 2 hours ago

$213

Roundtrip

found 2 hours ago

Select American Airlines flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $213 found 2 hours ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$218 Roundtrip, found 2 hours ago

$218

Roundtrip

found 2 hours ago

Select American Airlines flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $218 found 2 hours ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$221 Roundtrip, found 2 hours ago

$221

Roundtrip

found 2 hours ago

Select American Airlines flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $221 found 2 hours ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

IAD

Washington Dulles Intl.

$223 Roundtrip, found 3 days ago

$223

Roundtrip

found 3 days ago

Select Delta flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Washington Dulles Intl., returning Tue, Aug 12, priced at $223 found 3 days ago

Sat, Aug 2 - Fri, Aug 15

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$227 Roundtrip, found 3 days ago

$227

Roundtrip

found 3 days ago

Select Delta flight, departing Sat, Aug 2 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Fri, Aug 15, priced at $227 found 3 days ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$237 Roundtrip, found 2 hours ago

$237

Roundtrip

found 2 hours ago

Select American Airlines flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $237 found 2 hours ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$238 Roundtrip, found 2 hours ago

$238

Roundtrip

found 2 hours ago

Select Delta flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $238 found 2 hours ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$241 Roundtrip, found 2 hours ago

$241

Roundtrip

found 2 hours ago

Select American Airlines flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $241 found 2 hours ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$244 Roundtrip, found 2 hours ago

$244

Roundtrip

found 2 hours ago

Select United flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $244 found 2 hours ago

Sat, Aug 2 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$250 Roundtrip, found 3 days ago

$250

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sat, Aug 2 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $250 found 3 days ago

Mon, Aug 4 - Tue, Aug 12

STL

Lambert-St. Louis Intl.

DCA

Ronald Reagan Washington National

$254 Roundtrip, found 2 hours ago

$254

Roundtrip

found 2 hours ago

Select United flight, departing Mon, Aug 4 from Lambert-St. Louis Intl. to Ronald Reagan Washington National, returning Tue, Aug 12, priced at $254 found 2 hours ago