$73 Find Cheap Flights from St. Louis to District of Columbia - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from St. Louis to District of Columbia departing on 8/23. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Book Cheap St. Louis to District of Columbia Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from St. Louis to District of Columbia that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from St. Louis to District of Columbia

Wed, Jul 29 - Mon, Aug 3
Frontier Logo
8:08 pm - 12:51 pm
STL
-
DCA
15h 43m
1 stop
Frontier Logo
7:00 am - 7:23 pm
DCA
-
STL
13h 23m
1 stop
$274Frontier
Mon, Jul 27 - Wed, Jul 29
Southwest Logo
3:30 pm - 6:30 pm
STL
-
DCA
2h 00mnonstop
Southwest Logo
3:00 pm - 4:15 pm
DCA
-
STL
2h 15mnonstop
$275Southwest
Thu, Jul 30 - Mon, Aug 3
Frontier Logo
7:10 pm - 8:20 am
STL
-
IAD
12h 10m
1 stop
Frontier Logo
7:18 pm - 11:59 pm
IAD
-
STL
5h 41m
1 stop
$275Frontier
Fri, Aug 28 - Fri, Sep 4
Southwest Logo
8:10 am - 11:10 am
STL
-
DCA
2h 00mnonstop
Southwest Logo
8:15 am - 9:35 am
DCA
-
STL
2h 20mnonstop
$276Southwest
Fri, Jul 24 - Fri, Jul 31
Multiple Airlines Logo
2:00 pm - 2:07 pm
STL
-
IAD
23h 07m
2 stops
Multiple Airlines Logo
7:49 am - 8:57 am
IAD
-
STL
26h 08m
1 stop
$277Multiple Airlines
Fri, Jul 24 - Fri, Jul 31
Multiple Airlines Logo
2:00 pm - 2:07 pm
STL
-
IAD
23h 07m
2 stops
Multiple Airlines Logo
8:33 pm - 8:57 am
IAD
-
STL
13h 24m
1 stop
$278Multiple Airlines
Sat, Aug 1 - Sat, Aug 8
American Airlines Logo
6:55 am - 9:58 am
STL
-
DCA
2h 03mnonstop
American Airlines Logo
5:00 am - 9:32 am
DCA
-
STL
5h 32m
1 stop
$282American Airlines
Mon, Jul 27 - Sat, Aug 1
American Airlines Logo
6:43 am - 9:46 am
STL
-
DCA
2h 03mnonstop
American Airlines Logo
7:07 pm - 11:58 pm
DCA
-
STL
5h 51m
1 stop
$285American Airlines
Sat, Aug 1 - Thu, Aug 20
United Airlines Logo
8:43 am - 11:55 am
STL
-
IAD
2h 12mnonstop
United Airlines Logo
6:15 am - 10:12 am
IAD
-
STL
4h 57m
1 stop
$285United Airlines
Tue, Aug 11 - Thu, Aug 13
United Airlines Logo
8:40 am - 11:55 am
STL
-
IAD
2h 15mnonstop
United Airlines Logo
8:20 am - 12:02 pm
IAD
-
STL
4h 42m
1 stop
$286United Airlines
Booking Insights

KAYAK's insights & trends for St. Louis to District of Columbia flights

Get data-powered insights and trends into flights from St. Louis to District of Columbia to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from St. Louis to District of Columbia?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from St. Louis to District of Columbia departing in July.

What is the cheapest St. Louis to District of Columbia flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to District of Columbia from St. Louis found in the last 5 days was to Washington, D.C., at $257 round-trip. The most popular route is from St. Louis (STL) to Washington, D.C. Reagan-National Airport (DCA), and the cheapest round-trip airline ticket found on this route in the last 5 days was $257.

What is the cheapest time of day to fly to District of Columbia?

The average price for all round-trip flights from St. Louis to District of Columbia depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to District of Columbia is generally in the evening, when round-trip flights cost $346 on average. Morning departures are around 22% more expensive than evening flights, on average. The most expensive time of day to fly to District of Columbia is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $542.

Can I save money by flying with a layover from St. Louis to District of Columbia?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a layover may cost you more time, but you can also save money on the route, with a 1 stop layover the cheapest option at $396 on average.

What is the cheapest month to fly from St. Louis to District of Columbia?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from St. Louis to District of Columbia, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from St. Louis to District of Columbia is August, when tickets cost $67 (return) on average. On the other hand, the most expensive months are July and June, when the average cost of round-trip tickets is $198 and $180 respectively.

What’s the cheapest day of the week to fly from St. Louis to District of Columbia?

The average price of all round-trip flights from St. Louis to District of Columbia clicked on KAYAK for each day over the last 12 months.

When flying from St. Louis to District of Columbia, you should consider leaving on a Wednesday and avoid Thursdays if you are looking for the best rates. For your return to St. Louis, you’ll find the best rates on Saturdays and the most expensive ones on Mondays.

Good to know

Low seasonFebruary
Cheapest flight$73
Best time to beat the crowds but there is an average 14% increase in price.
Most popular time to fly with an average 15% increase in price.
Flight from St. Louis to Washington Dulles Airport

FAQs - booking District of Columbia flights

  • How does KAYAK find such low prices on flights from St. Louis to District of Columbia?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from St. Louis to District of Columbia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from St. Louis to District of Columbia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from St. Louis to District of Columbia is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from St. Louis to District of Columbia?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from St. Louis to District of Columbia with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from St. Louis to District of Columbia?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from St. Louis to District of Columbia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding cheap flights to District of Columbia

  • Looking for a cheap flight? 25% of our users found tickets from St. Louis to the following destinations at these prices or less: Washington, D.C. $191 one-way - $329 round-trip

Everything you need to know for your flight from St. Louis to District of Columbia

Information on your arrival and departure airports