$68 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 9/14. 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

Sat, Aug 29 - Tue, Sep 8
Frontier Logo
6:45 pm - 8:04 am
STL
-
IAD
12h 19m
1 stop
Frontier Logo
8:59 am - 5:50 pm
IAD
-
STL
9h 51m
1 stop
$268Frontier
Thu, Aug 27 - Sun, Aug 30
Frontier Logo
7:58 pm - 4:59 pm
STL
-
DCA
20h 01m
1 stop
Frontier Logo
7:00 am - 7:13 pm
DCA
-
STL
13h 13m
1 stop
$270Frontier
Fri, Aug 28 - Sun, Aug 30
Frontier Logo
7:58 pm - 4:59 pm
STL
-
DCA
20h 01m
1 stop
Frontier Logo
6:00 pm - 7:13 pm
DCA
-
STL
26h 13m
1 stop
$271Frontier
Thu, Sep 3 - Sun, Sep 6
American Airlines Logo
6:00 am - 9:14 am
STL
-
DCA
2h 14mnonstop
American Airlines Logo
3:42 pm - 5:10 pm
DCA
-
STL
2h 28mnonstop
$272American Airlines
Mon, Aug 17 - Tue, Aug 18
United Airlines Logo
1:00 pm - 4:06 pm
STL
-
IAD
2h 06mnonstop
United Airlines Logo
8:25 am - 9:39 am
IAD
-
STL
2h 14mnonstop
$272United Airlines
Sat, Dec 19 - Tue, Dec 29
American Airlines Logo
4:58 pm - 8:08 pm
STL
-
DCA
2h 10mnonstop
American Airlines Logo
2:55 pm - 4:26 pm
DCA
-
STL
2h 31mnonstop
$276American Airlines
Thu, Oct 15 - Mon, Oct 19
Delta Logo
7:20 pm - 12:31 am
STL
-
IAD
4h 11m
1 stop
Delta Logo
7:38 pm - 11:48 pm
IAD
-
STL
5h 10m
1 stop
$276Delta
Tue, Oct 20 - Tue, Oct 27
United Airlines Logo
8:30 am - 11:46 am
STL
-
IAD
2h 16mnonstop
United Airlines Logo
8:40 am - 10:12 am
IAD
-
STL
2h 32mnonstop
$277United Airlines
Thu, Sep 3 - Sun, Sep 6
Southwest Logo
10:10 am - 6:00 pm
STL
-
DCA
6h 50m
2 stops
Southwest Logo
6:05 am - 10:55 am
DCA
-
STL
5h 50m
1 stop
$283Southwest
Thu, Sep 3 - Sun, Sep 6
Southwest Logo
10:10 am - 6:00 pm
STL
-
DCA
6h 50m
2 stops
Southwest Logo
6:05 am - 10:55 am
DCA
-
STL
5h 50m
1 stop
$286Southwest
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 August.

Flight prices are below average for this route right now.

Flights to District of Columbia from St. Louis usually cost between $365 and $531 in August.
The lowest price found in the past 5 days was $268 on Frontier (Aug 29-Sep 8).

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 $269 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 $269.

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 $352 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 $532.

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 $381 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 October, when tickets cost $309 (return) on average. On the other hand, the most expensive months are February and June, when the average cost of round-trip tickets is $432 and $403 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 season

February

Cheapest flight

$68
Best time to beat the crowds but there is an average 11% increase in price.
Most popular time to fly with an average 11% 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.

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

Information on your arrival and departure airports