Find Cheap Flights from St. Louis to Washington, D.C. (STL - WAS)

Flights overview

Useful information for finding cheap flights from St. Louis to Washington, D.C. and booking your next trip

Cheapest round-trip flights	$213	American Nonstop 3 hr Thu, Aug 20 — Mon, Aug 24	The cheapest round-trip flight from St. Louis to Washington, D.C. is currently $213
Cheapest one-way flight	$89	American Nonstop 3 hr Wed, Aug 19	The cheapest one-way flight from St. Louis to Washington, D.C. is currently $89
Cheapest nonstop flights	$213	American Nonstop 3 hr Thu, Aug 13 — Mon, Aug 17	The cheapest nonstop round-trip flight from St. Louis to Washington, D.C. is currently $213
Last-minute weekend getaway	$451	United 1 stop 25 hr Sat, Jun 6 — Sun, Jun 7	The cheapest last-minute weekend getaway from St. Louis to Washington, D.C. is currently $451
Cheapest business class flights	$465	American 1 stop 5 hr Thu, Aug 13 — Mon, Aug 17	The cheapest business class round-trip flight from St. Louis to Washington, D.C. is currently $465

Fastest flight	1 hr 55 min	The fastest nonstop flight from St. Louis to Washington, D.C. takes 1 hr 55 min
Nonstop flights	Every day	There are direct flights on this route every day.

When is the cheapest time to fly?

The cheapest month to fly from St. Louis to Washington, D.C. is typically September. The most expensive month to fly is typically March.

September Cheapest	Typical prices: $140–215
March Most expensive	Typical prices: $240–340

Popular airlines from St. Louis to Washington, D.C.

Southwest

Nonstop

from $273

Typical price: $250–450

54 weekly nonstop flights

STL - BWI, DCA Every day

1746 weekly connecting flights

STL - BWI, DCA, IAD Every day
United

Nonstop

from $233

Typical price: $260–510

14 weekly nonstop flights

STL - IAD Every day

1240 weekly connecting flights

STL - BWI, DCA, IAD Every day
American

Nonstop

from $213

Typical price: $235–470

18 weekly nonstop flights

STL - DCA Every day

869 weekly connecting flights

STL - BWI, DCA, IAD Every day
Delta

from $233

Typical price: $270–570

968 weekly connecting flights

STL - BWI, DCA, IAD Every day
Frontier

from $258

Typical price: $175–455

61 weekly connecting flights

STL - BWI, DCA, IAD Every day
Alaska

from $766

Typical price: $620–1,600

56 weekly connecting flights

STL - BWI, DCA, IAD Every day

Popular airports near St. Louis

St. Louis Lambert International Airport (STL)

St. Louis United States 21 min 12 mi
General Wayne A. Downing Peoria International Airport (PIA)

Peoria United States 2 hr 35 min 143 mi
Columbia Regional Airport (COU)

Columbia United States 2 hr 7 min 109 mi
MidAmerica St. Louis Airport (BLV)

Belleville United States 34 min 20 mi

Popular airports near Washington, D.C.

Ronald Reagan Washington National Airport (DCA)

Washington United States 18 min 4 mi
Dulles International Airport (IAD)

Washington United States 54 min 22 mi
Baltimore/Washington International Thurgood Marshall Airport (BWI)

Baltimore United States 48 min 27 mi
Philadelphia International Airport (PHL)

Philadelphia United States 2 hr 19 min 116 mi

Frequently asked questions about flying from St. Louis to Washington, D.C.

The cheapest flights from St. Louis to Washington, D.C. are usually in September. Typical ticket prices in September range from $140 to $215.

The cheapest round-trip flight from St. Louis to Washington, D.C. recently found on Google Flights was with American from $213. The cheapest one-way flight was with American from $89.

Some of the cheapest round-trip deals we found with different airlines:

The cheapest Southwest flight from St. Louis to Washington, D.C. is $273, flying from Aug 6 to Aug 10.
The cheapest United flight from St. Louis to Washington, D.C. is $233, flying from Aug 20 to Aug 24.
The cheapest American flight from St. Louis to Washington, D.C. is $213, flying from Aug 13 to Aug 17.
The cheapest Delta flight from St. Louis to Washington, D.C. is $233, flying from Aug 13 to Aug 17.
The cheapest Frontier flight from St. Louis to Washington, D.C. is $258, flying from Aug 13 to Aug 17.
The cheapest Alaska flight from St. Louis to Washington, D.C. is $766, flying from Aug 29 to Aug 30.

The cheapest round-trip flight from St. Louis to Washington, D.C. starts at $213 from Thu, Aug 20 to Mon, Aug 24. The cheapest one-way flight starts at $89 and departs on Wed, Aug 19.

1 hr 55 min is the shortest flight time from St. Louis to Washington, D.C..

Mid-Mar–Jun is Washington DC's busiest time, with many people timing their visits to coincide with cherry blossom season (late Mar–mid Apr). Washington DC’s conference centers and hotels also bustle while Congress is in session (Sep–Nov and mid-Jan–Jun). Jul–Aug tend to be hot and humid, while snowfall can vary widely in winter. The city’s most popular events are the annual Cherry Blossom Festival in spring, the 4th of July celebration in summer, and the lighting of the National Christmas Tree in winter.

It's easy to use Google Flights to find the cheapest days to fly from St. Louis to Washington, D.C..
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.

What counts as the best airline for your flights from St. Louis to Washington, D.C. really depends on your individual needs. You may have a favorite carrier or a loyalty program you like, but price, convenience, and airports served also come into play. Flexibility and booking terms – Can you change flights if you want to stay longer or get a refund if you have to postpone your trip? – are also factors that help determine which airline is best to fly from St. Louis to Washington, D.C..

In terms of nonstop flights, Southwest is the most popular. Southwest offers 54 nonstop flights and 1,746 connecting flights per week. Southwest flies from St. Louis Lambert International Airport (STL) to Baltimore/Washington International Thurgood Marshall Airport (BWI) , Ronald Reagan Washington National Airport (DCA) , Dulles International Airport (IAD) .

Other popular airlines flying from St. Louis to Washington, D.C. are:

United offers 14 nonstop flights and 1,240 connecting flights per week. United flies from St. Louis Lambert International Airport (STL) to Baltimore/Washington International Thurgood Marshall Airport (BWI) , Ronald Reagan Washington National Airport (DCA) , Dulles International Airport (IAD) .
American offers 18 nonstop flights and 869 connecting flights per week. American flies from St. Louis Lambert International Airport (STL) to Baltimore/Washington International Thurgood Marshall Airport (BWI) , Ronald Reagan Washington National Airport (DCA) , Dulles International Airport (IAD) .
Delta offers 968 connecting flights per week. Delta flies from St. Louis Lambert International Airport (STL) to Baltimore/Washington International Thurgood Marshall Airport (BWI) , Ronald Reagan Washington National Airport (DCA) , Dulles International Airport (IAD) .
Frontier offers 61 connecting flights per week. Frontier flies from St. Louis Lambert International Airport (STL) to Baltimore/Washington International Thurgood Marshall Airport (BWI) , Ronald Reagan Washington National Airport (DCA) , Dulles International Airport (IAD) .
Alaska offers 56 connecting flights per week. Alaska flies from St. Louis Lambert International Airport (STL) to Baltimore/Washington International Thurgood Marshall Airport (BWI) , Ronald Reagan Washington National Airport (DCA) , Dulles International Airport (IAD) .

The number of connecting flights refers to distinct flights with at least one stop between St. Louis and Washington, D.C..

The cheapest round-trip flight from St. Louis to Washington, D.C. recently found on Google Flights was with American from $213. The cheapest one-way flight was with American from $89.

Some of the cheapest round-trip deals we found with different airlines:

The cheapest Southwest flight from St. Louis to Washington, D.C. is $273, flying from Aug 6 to Aug 10.
The cheapest United flight from St. Louis to Washington, D.C. is $233, flying from Aug 20 to Aug 24.
The cheapest American flight from St. Louis to Washington, D.C. is $213, flying from Aug 13 to Aug 17.
The cheapest Delta flight from St. Louis to Washington, D.C. is $233, flying from Aug 13 to Aug 17.
The cheapest Frontier flight from St. Louis to Washington, D.C. is $258, flying from Aug 13 to Aug 17.
The cheapest Alaska flight from St. Louis to Washington, D.C. is $766, flying from Aug 29 to Aug 30.

Southwest, American and United fly direct from St. Louis to Washington, D.C..

There are 54 Southwest direct flights from St. Louis to Washington, D.C. per week. Flights are available every day.
There are 14 United direct flights from St. Louis to Washington, D.C. per week. Flights are available every day.
There are 18 American direct flights from St. Louis to Washington, D.C. per week. Flights are available every day.

Use the Stops filter while searching for flights, to see only nonstop options in your results.

The cheapest last-minute deal between St. Louis and Washington, D.C. at price $451 is offered by United from Sat, Jun 6 to Sun, Jun 7.

Southwest, American and United fly direct from St. Louis to Washington, D.C..

There are 54 Southwest direct flights from St. Louis to Washington, D.C. per week. Flights are available every day.
There are 14 United direct flights from St. Louis to Washington, D.C. per week. Flights are available every day.
There are 18 American direct flights from St. Louis to Washington, D.C. per week. Flights are available every day.

Use the Stops filter while searching for flights, to see only nonstop options in your results.

There are direct flights from St. Louis to Washington, D.C. on a daily basis.

The cheapest direct (nonstop) round-trip flights between St. Louis and Washington, D.C. start at $213 from Thu, Aug 13 to Mon, Aug 17 with American.

It's easy to find nonstop flights with Google Flights! Once you've searched for flights from St. Louis to Washington, D.C., just select the nonstop flights only option in the 'Stops’ filter in the search form and view all available direct flights and their prices.

The cheapest business class round-trip flights between St. Louis and Washington, D.C. start at $465 from Thu, Aug 13 to Mon, Aug 17 with American.

The cheapest economy class round-trip flights between St. Louis and Washington, D.C. start at $213 from Thu, Aug 20 to Mon, Aug 24.

To book business class trips from St. Louis to Washington, D.C., look for the default Economy selection at the top, and change it to your desired cabin class such as Premium Economy, Business Class, or First Class. You can then select your departure and arrival dates, consider available options, and book your business travel.

You can also adjust the trip type to view one-way fares.

The best last-minute getaway deal for the next weekend between St. Louis and Washington, D.C. starts at $451 from Sat, Jun 6 to Sun, Jun 7 with United.

The cheapest last-minute deal between St. Louis and Washington, D.C. at price $451 is offered by United from Sat, Jun 6 to Sun, Jun 7.

To find last-minute flight deals from St. Louis to Washington, D.C., start by entering the city names, select the desired departure and return dates, and hit the Search button to view flight options.

You can check for last-minute flights for the same day or adjust the trip type to see one-way fares.