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Uncover the best deals on St Louis to Washington flights by comparing fares from hundreds of airlines and agencies.
Good to Know: Cheapest and Fastest STL - IAD Flights
Useful information for finding best airline tickets from Lambert St Louis International to Washington Dulles International on your next trip.
Cheapest Round Trip Flight
$411
American Airlines
• 1 stop
• 15h 10m
Aug 08 – Aug 16
The cheapest round trip flight from St Louis to Washington (STL-IAD-STL) is currently $411
Cheapest Direct Flight
$495
United Airlines
• nonstop
• 3h 32m
Aug 08
The cheapest nonstop flight from St Louis to Washington (STL-IAD) is currently $495
Fastest Flight
3h 32m
The fastest nonstop flight from St Louis to Washington (STL-IAD) takes 3h 32m
Top Airlines Flying from St Louis to Washington
Latest Flight Deals from St Louis (STL) to Washington (IAD)
Compare and book low fare round-trip air tickets from St Louis to Washington. Ideal for travelers with confirmed return itineraries.
Aug 08 - Aug 16, Economy
St Louis → Washington
15h 10m
6:54 AM - 5:04 PM • 1 stop
St Louis → Washington
10h 23m
6:33 AM - 11:56 AM • 1 stop
American Airlines
Aug 08 - Aug 16, Economy
St Louis → Washington
15h 34m
10:22 AM - 8:56 PM • 1 stop
St Louis → Washington
10h 16m
6:38 PM - 11:54 PM • 1 stop
American Airlines
Aug 08 - Aug 16, Economy
St Louis → Washington
12h 10m
8:34 AM - 5:04 PM • 1 stop
St Louis → Washington
7h 3m
5:08 AM - 8:31 AM • 1 stop
American Airlines
Aug 08 - Aug 16, Economy
St Louis → Washington
3h 32m
8:43 AM - 11:55 AM • nonstop
St Louis → Washington
3h 34m
8:25 AM - 9:39 AM • nonstop
United Airlines
Aug 08 - Aug 16, Economy
St Louis → Washington
7h 27m
5:34 PM - 11:21 PM • 1 stop
St Louis → Washington
6h 57m
5:25 PM - 8:42 PM • 1 stop
Delta Airlines
Flying to Washington soon? We've surfaced some of the most affordable last-minute flights from St Louis to Washington, ideal for urgent plans or spontaneous trips.
Aug 08 - Aug 16, Economy
St Louis → Washington
15h 10m
6:54 AM - 5:04 PM • 1 stop
St Louis → Washington
10h 23m
6:33 AM - 11:56 AM • 1 stop
American Airlines
Aug 08 - Aug 16, Economy
St Louis → Washington
15h 34m
10:22 AM - 8:56 PM • 1 stop
St Louis → Washington
10h 16m
6:38 PM - 11:54 PM • 1 stop
American Airlines
Aug 08 - Aug 16, Economy
St Louis → Washington
12h 10m
8:34 AM - 5:04 PM • 1 stop
St Louis → Washington
7h 3m
5:08 AM - 8:31 AM • 1 stop
American Airlines
Aug 08 - Aug 16, Economy
St Louis → Washington
3h 32m
8:43 AM - 11:55 AM • nonstop
St Louis → Washington
3h 34m
8:25 AM - 9:39 AM • nonstop
United Airlines
Aug 08 - Aug 16, Economy
St Louis → Washington
7h 27m
5:34 PM - 11:21 PM • 1 stop
St Louis → Washington
6h 57m
5:25 PM - 8:42 PM • 1 stop
Delta Airlines
Looking for the fastest way to Washington? These direct flight options from STL to IAD offer both convenience and value—no layovers, just straight to your destination.
Aug 08 - Aug 16, Economy
St Louis → Washington
3h 32m
8:43 AM - 11:55 AM • nonstop
St Louis → Washington
3h 34m
8:25 AM - 9:39 AM • nonstop
United Airlines
FAQs on St Louis to Washington Flights
What are the airports in St Louis?
STL
What’s the most popular airline flying from STL to IAD?
The most popular airline flying from St Louis to Washington are
Can I fly from STL to IAD non-stop?
Yes, you can fly STL to IAD non-stop on
Which airlines fly nonstop between St Louis and Washington?
The non-stop flights between St Louis and Washington are .
What’s the earliest departure time from STL to IAD Airport?
The earliest flight leaves STL at 6:54 am and lands in IAD - Washington Dulles International
What are the airports in Washington?
IAD,BWI,DCA
Can I make changes to my St Louis to Washington flight tickets or cancel them on FareLeaders.com?
No. We are an airfare comparison site. All the tickets are booked by the travel agent offering the flight deal and any changes or cancellations to be made are directly done directly by them or the airlines.
Can I cancel my flight tickets from STL to IAD?
Read the fare rules of the St Louis to Washington air tickets booked. Some airlines allow you to cancel the tickets within a stipulated time period with a cancellation fee.
Which airline alliances offer flights from St Louis and Washington?
operate flights between St Louis and Washington
How long does a flight from St Louis to Washington take?
It takes approximately 2 hour to fly non-stop from STL to IAD, which is 696.18 miles by air.
Which airlines provide the cheapest flights from St Louis (STL) to Washington (IAD) ?
In the past couple of days, the cheapest tickets to IAD from STL were found on AA : USD 411
Do I need a passport to fly between STL and IAD?
No
What’s the latest departure time from STL to IAD ?
The last flight leaves STL at 7:05 pm
St Louis (STL) to Washington (IAD): Airport Information
| Origin Airport | Lambert St Louis International , St Louis, US |
| Destination Airport | Washington Dulles International , Washington, US |
| Distance | 696 miles |
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