Cheap flights from St. Louis to Washington, D.C.

Flight deals from St. Louis to Washington, D.C.

Below you can see the best deals on flights St. Louis — Washington, D.C. for upcoming dates. Direct and connecting flights from various airlines — compare prices and choose the right ticket.

The lowest price for the next 2 months is on 16 September, from $68.

Top 10 cheap flights from St. Louis to Washington, D.C.

St. Louis — Washington, D.C.

14:29—00:10

23 Sep 2026

8 h 41 m

1 stop

St. Louis — Washington, D.C.

14:29—17:18

23 Sep 2026

25 h 49 m

1 stop

St. Louis — Washington, D.C.

14:29—00:10

23 Sep 2026

32 h 41 m

1 stop

St. Louis — Washington, D.C.

14:29—00:10

16 Sep 2026

8 h 41 m

1 stop

St. Louis — Washington, D.C.

14:29—17:18

16 Sep 2026

25 h 49 m

1 stop

St. Louis — Washington, D.C.

14:29—00:10

16 Sep 2026

32 h 41 m

1 stop

St. Louis — Washington, D.C.

14:29—00:10

21 Sep 2026

8 h 41 m

1 stop

St. Louis — Washington, D.C.

14:29—17:18

21 Sep 2026

25 h 49 m

1 stop

St. Louis — Washington, D.C.

14:29—00:10

21 Sep 2026

32 h 41 m

1 stop

St. Louis — Washington, D.C.

14:29—00:10

14 Sep 2026

8 h 41 m

1 stop

Prices were found in the last 72 hours and may change — check the exact price when you continue.

About the St. Louis — Washington, D.C. flight

Looking for cheap flights from St. Louis to Washington, D.C.? Compare fares from different airlines, check the flight schedule and travel time — and book your St. Louis — Washington, D.C. ticket online at the best price.

The route has direct flights — around 52 flights per week, flights are operated by United Airlines, American Airlines, Lufthansa, a nonstop flight takes about 2 h 3 min, the distance between the cities is around 1,143 km.

Planning your trip? You may find our Washington, D.C. travel guide, how to get from the airport into town and Washington, D.C. weather forecast useful. To catch a low fare, use the low-price calendar and the monthly price chart on this page.

from $68Min. price

SeptemberCheapest

AugustPeak season

YesDirect flights

1,143 kmDistance

2 h 3 minTravel time

3Airlines

52 / wkFlights

Flight schedule from St. Louis to Washington, D.C.

The table shows direct flights from St. Louis to Washington, D.C. on the selected date. The flight takes approximately 2 h 3 min. Regular flights are operated by United Airlines, American Airlines and Lufthansa. Departures from Lambert-St. Louis International Airport airports, arrivals at Washington Dulles International Airport, Baltimore/Washington International Thurgood Marshall Airport and Ronald Reagan National Airport.

For each flight, the following details are shown: departure time (local), arrival city and airport, flight number and airline, terminal or gate, and status. Click on a flight to open its details and go to ticket search. To view flights on a different day, change the date above the table.

Today

Any time

Last update: 25 Aug 2026

Airline

Flight

Departure

Arrival

Duration

Days

Status

Below is a calendar of the lowest flight ticket prices for St. Louis — Washington, D.C. by day. Pick a convenient date and instantly see the fare. The cheapest flights on this route start from $68 in September, and the most expensive are around $242 in August. If your travel dates are flexible, the calendar will help you find the best price for your preferred period. To view round-trip fares, switch to the "Round trip" tab above the calendar, select your departure date — and the right-hand calendar will highlight the lowest prices for return flights on each day.

Prices by month

Average one-way fares from St. Louis to Washington, D.C. by month. Tickets are usually cheapest in August (around $118) and priciest in February (about $175) — use the table and chart below to pick the best time to fly.

Month	Average price	Level	Month	Average price	Level	Month	Average price	Level
Jan	$133	medium	May	$147	medium	Sep	$128	low
Feb	$175	high	Jun	$166	high	Oct	$138	medium
Mar	$170	high	Jul	$170	high	Nov	$166	high
Apr	$143	medium	Aug	$118	low	Dec	$175	high

Some values are estimated based on seasonality.

When to fly

Weather in Washington, D.C.: it is warmest in July (up to 32 °C on average) and coolest in January (around 7 °C). The driest month is October.

Tickets are usually cheapest in September and most expensive in August. Compare prices and weather by month in the charts below to pick the best time to fly.

Temperature · Washington, D.C.

Dry and wet days · Washington, D.C.

Wind speed and direction · Washington, D.C.

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How to get the best deal on a St. Louis — Washington, D.C. ticket

Book ahead: fares for St. Louis — Washington, D.C. are usually lower 3–8 weeks before departure than at the last minute.
Play with your dates — Tuesday, Wednesday and Saturday departures are often cheaper than Friday and Sunday.
The cheapest month to fly to Washington, D.C. is usually September — plan your trip around it if your dates are flexible.
Compare direct and connecting flights: nonstop is faster, while a connection is sometimes noticeably cheaper.
Watch the low-price calendar and the monthly price trend on this page — they make it easier to catch a good date.
Travelling light? Pick a cabin-baggage-only fare — tickets without checked luggage are noticeably cheaper.
Get to the airport in good time — about 2–3 hours before an international departure and roughly an hour before a domestic one.

Flights on the St. Louis — Washington, D.C. route are operated by 3 airlines; United Airlines runs the most flights (around 46% of all flights). Compare carriers, flight shares and schedules below.

United AirlinesUA
8x/week
WebsiteFleet: 956165M pax/year
- Direct flight STL → IAD8x/week
  Duration
  2h 10m
  Days
  MTWTFSS
46.2%Open →
American AirlinesAA
8x/week
WebsiteFleet: 965211M pax/year
- Direct flight STL → DCA8x/week
  Duration
  2h 11m
  Days
  MTWTFSS
44.2%Open →
LufthansaLH
2x/week
WebsiteFleet: 38764.5M pax/year
- Direct flight STL → IAD2x/week
  Duration
  2h 6m
  Days
  MTWTFSS
9.6%Open →

Cities and airports on the St. Louis — Washington, D.C. route

Flights St. Louis — Washington, D.C. depart from Lambert-St. Louis International Airport and arrive at Washington Dulles International Airport, Baltimore/Washington International Thurgood Marshall Airport and Ronald Reagan National Airport. Below are pages for the cities, countries, and airports on the route: airlines, schedules, and travel guides.

Departure

St. Louis

STL

United States

About the city How to get there Weather All about the country United States

Arrival

Washington, D.C.

WAS

United States

About the city How to get there Weather All about the country United States

Departure airports

Lambert-St. Louis International AirportSTL
About the airport

Arrival airports

Washington Dulles International AirportIAD
About the airport
Baltimore/Washington International Thurgood Marshall AirportBWI
About the airport
Ronald Reagan National AirportDCA
About the airport

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Frequently asked questions about the St. Louis — Washington, D.C. flight

How long is the flight from St. Louis to Washington, D.C.?

A nonstop St. Louis — Washington, D.C. flight takes about 2 h 3 min — the distance between the cities is around 1,143 km.

How far is it from St. Louis to Washington, D.C.?

The distance from St. Louis to Washington, D.C. is about 1,143 km, which a nonstop flight covers in around 2 h 3 min.

Are there direct flights from St. Louis to Washington, D.C.?

Yes, there are nonstop flights St. Louis — Washington, D.C. — around 52 flights per week.

Which airlines fly from St. Louis to Washington, D.C.?

Airlines operating St. Louis — Washington, D.C. include United Airlines, American Airlines, Lufthansa. See the full list with schedules in the "Airlines" section on this page.

Which airports do St. Louis — Washington, D.C. flights use?

Flights from St. Louis depart from Lambert-St. Louis International Airport, and arrive at Washington Dulles International Airport, Baltimore/Washington International Thurgood Marshall Airport, Ronald Reagan National Airport. If a city has more than one airport, check which one your ticket uses before you travel.

How much is a ticket from St. Louis to Washington, D.C.?

The price of a St. Louis — Washington, D.C. ticket depends on your travel date, season and demand: it is usually cheapest to fly in September, and most expensive in August. Tickets typically cost between $68 and $242. Check the current lowest fare and low-price calendar on this page.

When is the best time to book flights St. Louis — Washington, D.C.?

Flights St. Louis — Washington, D.C. are usually cheaper when booked in advance — a few weeks before departure and away from peak dates; the most budget-friendly month to fly is September. Compare prices by month in the price trend chart on this page.

How can I find the cheapest flights from St. Louis to Washington, D.C.?

To catch a low fare St. Louis — Washington, D.C., book a few weeks in advance, keep your dates flexible, and compare airlines and connecting options. The low-price calendar and monthly price chart on this page show the cheapest days and months at a glance: the most budget-friendly month to fly is usually September.

How early should I arrive at the airport?

For international flights, plan to be at the airport about 2–3 hours before departure, and around an hour before a domestic flight. Allow extra time during busy travel seasons and at large hubs, where check-in and security lines can be longer.

Cheap flights from St. Louis to Washington, D.C.

Flight deals from St. Louis to Washington, D.C.

Top 10 cheap flights from St. Louis to Washington, D.C.

St. Louis — Washington, D.C.

St. Louis — Washington, D.C.

St. Louis — Washington, D.C.

St. Louis — Washington, D.C.

St. Louis — Washington, D.C.

St. Louis — Washington, D.C.

St. Louis — Washington, D.C.

St. Louis — Washington, D.C.

St. Louis — Washington, D.C.

St. Louis — Washington, D.C.

Top 10 direct flights from St. Louis to Washington, D.C.

St. Louis — Washington, D.C.

St. Louis — Washington, D.C.

St. Louis — Washington, D.C.

St. Louis — Washington, D.C.

St. Louis — Washington, D.C.

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St. Louis to Washington, D.C.: departing soon

St. Louis — Washington, D.C.

St. Louis — Washington, D.C.

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St. Louis — Washington, D.C.

St. Louis — Washington, D.C.

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St. Louis — Washington, D.C.

About the St. Louis — Washington, D.C. flight

Facts about this route

Flight schedule from St. Louis to Washington, D.C.

Flight ticket prices by day: St. Louis — Washington, D.C.

Prices by month

When to fly

Temperature · Washington, D.C.

Dry and wet days · Washington, D.C.

Wind speed and direction · Washington, D.C.

We'll let you know if you need a visa

How to get the best deal on a St. Louis — Washington, D.C. ticket

Cities and airports on the St. Louis — Washington, D.C. route

St. Louis

Washington, D.C.

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Where else you can fly from Washington, D.C.

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