£286 Cheap Flights from St. Louis (STL) to Washington (DCA)

View £286 flight on Thu, 7 May 2026Opens in a new window

Flight 1

Popular airlines from Lambert-St. Louis International Airport (STL) to Ronald Reagan National Airport (DCA)

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Cheap Flights from St. Louis (STL) to Washington (DCA)

Prices were available within the past 7 days and start at £286 for one-way flights and £928 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Alaska Airlines
Mon, 15 Jun - Mon, 22 Jun
STL
St. Louis
DCA
Washington
£928 Return, found 8 hours ago
£928
Return
found 8 hours ago
Select Alaska Airlines flight, departing Mon, 15 Jun from St. Louis to Washington, returning Mon, 22 Jun, priced at £928 found 8 hours ago
Alaska Airlines
Wed, 17 Jun - Wed, 24 Jun
STL
St. Louis
DCA
Washington
£976 Return, found 8 hours ago
£976
Return
found 8 hours ago
Select Alaska Airlines flight, departing Wed, 17 Jun from St. Louis to Washington, returning Wed, 24 Jun, priced at £976 found 8 hours ago
Alaska Airlines
Wed, 17 Jun - Wed, 24 Jun
STL
St. Louis
DCA
Washington
£1,006 Return, found 8 hours ago
£1,006
Return
found 8 hours ago
Select Alaska Airlines flight, departing Wed, 17 Jun from St. Louis to Washington, returning Wed, 24 Jun, priced at £1,006 found 8 hours ago
Alaska Airlines
Mon, 15 Jun - Mon, 22 Jun
STL
St. Louis
DCA
Washington
£1,028 Return, found 8 hours ago
£1,028
Return
found 8 hours ago
Select Alaska Airlines flight, departing Mon, 15 Jun from St. Louis to Washington, returning Mon, 22 Jun, priced at £1,028 found 8 hours ago
Alaska Airlines
Mon, 15 Jun - Mon, 22 Jun
STL
St. Louis
DCA
Washington
£1,029 Return, found 8 hours ago
£1,029
Return
found 8 hours ago
Select Alaska Airlines flight, departing Mon, 15 Jun from St. Louis to Washington, returning Mon, 22 Jun, priced at £1,029 found 8 hours ago
Alaska Airlines
Mon, 15 Jun - Mon, 22 Jun
STL
St. Louis
DCA
Washington
£1,068 Return, found 8 hours ago
£1,068
Return
found 8 hours ago
Select Alaska Airlines flight, departing Mon, 15 Jun from St. Louis to Washington, returning Mon, 22 Jun, priced at £1,068 found 8 hours ago
Alaska Airlines
Wed, 17 Jun - Wed, 24 Jun
STL
St. Louis
DCA
Washington
£1,077 Return, found 8 hours ago
£1,077
Return
found 8 hours ago
Select Alaska Airlines flight, departing Wed, 17 Jun from St. Louis to Washington, returning Wed, 24 Jun, priced at £1,077 found 8 hours ago
Alaska Airlines
Wed, 17 Jun - Wed, 24 Jun
STL
St. Louis
DCA
Washington
£1,078 Return, found 8 hours ago
£1,078
Return
found 8 hours ago
Select Alaska Airlines flight, departing Wed, 17 Jun from St. Louis to Washington, returning Wed, 24 Jun, priced at £1,078 found 8 hours ago
Alaska Airlines
Mon, 15 Jun - Mon, 22 Jun
STL
St. Louis
DCA
Washington
£1,083 Return, found 8 hours ago
£1,083
Return
found 8 hours ago
Select Alaska Airlines flight, departing Mon, 15 Jun from St. Louis to Washington, returning Mon, 22 Jun, priced at £1,083 found 8 hours ago
Alaska Airlines
Thu, 11 Jun - Thu, 18 Jun
STL
St. Louis
DCA
Washington
£1,087 Return, found 8 hours ago
£1,087
Return
found 8 hours ago
Select Alaska Airlines flight, departing Thu, 11 Jun from St. Louis to Washington, returning Thu, 18 Jun, priced at £1,087 found 8 hours ago

Alternative airports near Washington

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Baltimore Washington Intl. Thurgood Marshall BWI. Cheapest option available. Average driving time to city centre is 40 minutes. Flights from £1,009
BWI
Baltimore Washington Intl. Thurgood Marshall
Cheapest
Average driving time to city centre40 min
Flights from £1,009

Frequently asked questions

How much does a flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National) cost?
One-way flights typically cost between £370 and £595 and return flights often range between £370 and £595. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when Anaa (AAA) to Toronto, ON (YYZ-Pearson Intl.) ticket fares go up or down.
What is the cheapest month to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National)?
August is typically the cheapest month to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National), with average return fares of approximately £201. This is about 14% lower than the average price throughout the year. August often sees lower prices as summer travel winds down and before the peak autumn season. Other cheap months to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National) include January and September.
Which airlines fly direct from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National)?
Enter STL to DCA and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National)?
To find a cheap flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best airline to fly with from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National)?
The best airline to fly with from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National) will differ from traveller to traveller. If you like to fly early, AA offers early morning flights. If price is the most important factor, WN typically offers the lowest fares. WN offers the most daily flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National), which is brilliant if flexibility is what you value most. The best carrier for this journey could also be the one you have a loyalty membership with, as flying with that airline or another airline within the same alliance could help you collect points or enjoy lounge access.
What is the best time to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National)?
Based on booking data from the past year, the cheapest months to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National) are typically August and September, with average return flights around £201. However, April is the most popular month for this route, meaning you'll find plenty of flight options then, though prices might be higher. If you're looking for the best value, aiming for August or September could save you money, while April offers the most flexibility in terms of schedules.
How many flights per day from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National)?
There are approximately 8 nonstop flights per day from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National). For even more choice, look at flights that include layovers, as there are around 110 connecting flights per day. Some common connection points include O'Hare Intl. (ORD), Hartsfield-Jackson Atlanta Intl. (ATL), and Midway Intl. (MDW).
What is the earliest flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National)?
The earliest flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National) typically departs at approximately 5:00 AM local time, operated by American Airlines. This is a seasonal service active in May and July. An early departure like this can help maximise your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National)?
You'll typically find the most flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National) on a Friday, with around 63 flights available. This gives you plenty of options for your travel plans. Major airlines on this route include Southwest Airlines, American Airlines, and Delta Air Lines. Friday sees notably more flight options compared to other days of the week.
What are the most popular departure times for flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National)?
The most popular departure times for flights from St. Louis, MO (STL-Lambert-St. Louis Intl.) (STL) to Washington, DC (DCA-Ronald Reagan Washington National) (DCA) are in the early morning, from 6am to 9am. About 32% of passengers prefer this time. Many major carriers, including United Airlines, Delta Air Lines and American Airlines, offer flights during this window. This timing works well because you can get an early start on your travel day and arrive at your destination with plenty of time for your plans.
How long does it take to fly from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National)?
Flying nonstop from STL to DCA takes around 2 hours, with the route covering approximately 717 miles. Flights with a layover typically take 3 hours 50 minutes longer than direct options. Keep in mind that actual flight times can vary due to wind patterns, weather, and air traffic.
Can you fly business or first class from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National)?
Select the "Business class" and "First class" filters when looking for STL to DCA flights on Expedia. This is the easiest way to compare prices, routes and flight times for your trip.
How do I earn miles on a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National) flight with Expedia?
It's easy to earn miles on a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia. *Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for Washington from Lambert-St. Louis Intl. (STL)?
When traveling from Lambert-St. Louis Intl. (STL) to Washington, you can fly into Washington Dulles Intl. (IAD) and Ronald Reagan Washington National (DCA). Some flights may connect through major hubs like O'Hare Intl. (ORD), Philadelphia Intl. (PHL), Eppley Field (OMA) before reaching Washington. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National) at the last minute?
Typically, booking a last minute flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National) flight and hotel package?
Securing a St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National)?
If you booked your St. Louis, MO (STL-Lambert-St. Louis Intl.) to Washington, DC (DCA-Ronald Reagan Washington National) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Ronald Reagan Washington National
Airlines serving
Alaska Airlines
Return price
£927
Distance
1147 km
Average flight time
3 hours 3 mins

Book with confidence

Compare flights from St. Louis to Washington easily and book with confidence

For travelling on business or for pleasure, Expedia makes it easy to book your flights from St. Louis to Washington. Operating between them flights per day, 20 airlines cover the route. And fly direct, getting you to Ronald Reagan Washington National in just hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Lambert-St. Louis Intl. to Ronald Reagan Washington National.  

To make things even better, in the advanced search, you can also choose to fly economy, premium economy, business or first class, select your maximum number of stops, and pick your preferred departure and arrival time. You can also opt for refundable and direct flights. 

Grab a great deal on your flight from Lambert-St. Louis Intl. (STL) to Ronald Reagan Washington National (DCA)

The easiest way to view the best deals on flights from St. Louis to Washington today is to enter your travel dates and hit search. From here, you can sort your results by price to see the cheapest flights first. Right now, return flights from Lambert-St. Louis Intl. to Ronald Reagan Washington National start at just £928 and range up to £1,087.  

To find an even better deal, try  

  • being flexible on your dates – midweek flights can be cheaper
  • looking for other airports near St. Louis and Washington
  • booking your flight during June, the cheapest month on this route
  • varying your flight times – early morning and late at night are sometimes cheaper 

Why you should book your St. Louis to Washington flight with Expedia!

We cater for all flight types, cabin classes and airlines. So whether you’re booking flights from Lambert-St. Louis Intl. to Ronald Reagan Washington National for a budget break or a business trip with a bit of pleasure thrown in, we make it easy to secure the seat that’s right for you.  

Thanks to our supersized inventory that offers great choice all in one place, you know you’ll get a great deal with Expedia. Especially if you bundle your flight together with your hotel, you will unlock amazing savings. For added peace of mind, you can choose flexible bookings or filter to find refundable options, so you won’t pay a fee to change your flight.  

Compare flights from St. Louis to Washington easily and book with confidence

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*Available to Expedia members.