£87 Cheap Flights from St. Louis (STL) to Washington (IAD)

Featured airlines

    Plan, book, fly with confidence
    trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
    bex rewards loyalty icon
    Book smarter
    Save up to 25% on select hotels after you book a flight*
    payments icon
    Earn twice
    Earn your airline miles on top of our rewards
    Sign in

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

Prices were available within the past 7 days and start at £87 for one-way flights and £162 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Tue, 4 Jun - Tue, 11 Jun
STL
St. Louis
IAD
Washington
£162 Return, found 4 days ago
£162
Return
found 4 days ago
Select Delta flight, departing Tue, 4 Jun from St. Louis to Washington, returning Tue, 11 Jun, priced at £162 found 4 days ago
Delta
Tue, 4 Jun - Sun, 16 Jun
STL
St. Louis
IAD
Washington
£166 Return, found 4 days ago
£166
Return
found 4 days ago
Select Delta flight, departing Tue, 4 Jun from St. Louis to Washington, returning Sun, 16 Jun, priced at £166 found 4 days ago
Delta
Wed, 12 Jun - Wed, 19 Jun
STL
St. Louis
IAD
Washington
£174 Return, found 4 days ago
£174
Return
found 4 days ago
Select Delta flight, departing Wed, 12 Jun from St. Louis to Washington, returning Wed, 19 Jun, priced at £174 found 4 days ago
American Airlines
Wed, 12 Jun - Wed, 19 Jun
STL
St. Louis
IAD
Washington
£186 Return, found 4 days ago
£186
Return
found 4 days ago
Select American Airlines flight, departing Wed, 12 Jun from St. Louis to Washington, returning Wed, 19 Jun, priced at £186 found 4 days ago
Delta
Wed, 12 Jun - Wed, 19 Jun
STL
St. Louis
IAD
Washington
£187 Return, found 4 days ago
£187
Return
found 4 days ago
Select Delta flight, departing Wed, 12 Jun from St. Louis to Washington, returning Wed, 19 Jun, priced at £187 found 4 days ago
Delta
Mon, 10 Jun - Sun, 16 Jun
STL
St. Louis
IAD
Washington
£190 Return, found 4 days ago
£190
Return
found 4 days ago
Select Delta flight, departing Mon, 10 Jun from St. Louis to Washington, returning Sun, 16 Jun, priced at £190 found 4 days ago
United
Wed, 12 Jun - Wed, 19 Jun
STL
St. Louis
IAD
Washington
£194 Return, found 4 days ago
£194
Return
found 4 days ago
Select United flight, departing Wed, 12 Jun from St. Louis to Washington, returning Wed, 19 Jun, priced at £194 found 4 days ago
American Airlines
Tue, 11 Jun - Tue, 18 Jun
STL
St. Louis
IAD
Washington
£199 Return, found 4 days ago
£199
Return
found 4 days ago
Select American Airlines flight, departing Tue, 11 Jun from St. Louis to Washington, returning Tue, 18 Jun, priced at £199 found 4 days ago
Delta
Sat, 8 Jun - Sat, 15 Jun
STL
St. Louis
IAD
Washington
£200 Return, found 4 days ago
£200
Return
found 4 days ago
Select Delta flight, departing Sat, 8 Jun from St. Louis to Washington, returning Sat, 15 Jun, priced at £200 found 4 days ago
United
Tue, 11 Jun - Tue, 18 Jun
STL
St. Louis
IAD
Washington
£201 Return, found 4 days ago
£201
Return
found 4 days ago
Select United flight, departing Tue, 11 Jun from St. Louis to Washington, returning Tue, 18 Jun, priced at £201 found 4 days ago
Flight from St. Louis to Washington route information
Origin airport
Lambert-St. Louis Intl.
Destination airport
Washington Dulles Intl.
Return price
£162
Distance
1111 km
Average flight time
3 hours 10 mins

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

For travelling on business or for pleasure, Expedia makes it easy to book your flights from St. Louis to Washington. Operating between them 6 flights per day, 20 airlines cover the route. And Avianca, Copa Airlines, Brussels Airlines, Lufthansa, United Airlines fly direct, getting you to Washington Dulles Intl. in just 2hours. If you have a preferred carrier, use our advanced search tool to find the right flight from Lambert-St. Louis Intl. to Washington Dulles Intl..  

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 Washington Dulles Intl. (IAD) 

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 Washington Dulles Intl. start at just £162 and range up to £201.  

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 Washington Dulles Intl. 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.  

Frequently asked questions

How much is a flight from STL to Washington Dulles Intl. Airport (IAD)?
If you’re planning on travelling between STL and Washington Dulles Intl. Airport (IAD), round-trip journeys start from £162. This price is based on fares available within the last 7 days on Expedia for flights departing within the next year, so don’t hang around. Book now and save yourself both money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Lambert-St. Louis Intl. Airport (STL) to IAD?
This differs between air carriers, as each has its own set of terms and conditions. Head to the Customer Service Portal, where you’ll find instructions on how to cancel online.
How do I find cheap flights from Lambert-St. Louis Intl. Airport (STL) to IAD that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you’re searching for Lambert Field to IAD flights, you’ll see a “no change fees” filter for you to select.
How far is the flight from Lambert-St. Louis Intl. Airport (STL) to Dulles Intl. Airport?
With a flight distance of 1,100 kilometres, it’s only a hop from Lambert Field to IAD. It might be a quick journey, but it’s still worth bringing a good book to read.
Which airlines fly direct from Lambert Field to Washington Dulles Intl. Airport (IAD)?
Operating 60 flights monthly, United Airlines (UA) is a great choice when flying directly from Lambert Field to IAD.
Are STL to Dulles Intl. Airport flight tickets cheaper when they're purchased at the last minute?
Booking your trip from Lambert Field to IAD at the last minute could be your ticket to a fantastic deal. However, it could end up costing you a whole lot more! If you’d rather avoid the risk, book well ahead of your departure date. In fact, Expedia has some of the biggest bargains up to 12 months in advance. If your preferred carrier hasn’t released tickets yet, check back often as deals are updated all the time on Expedia.
Washington Airports

Baltimore

*Available to Expedia members.