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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
$271
Delta Airlines
• 1 stop
• 6h 51m
Oct 21 – Oct 23
The cheapest round trip flight from St Louis to Washington (STL-IAD-STL) is currently $271
Cheapest One way Flight
$291
Delta Airlines
• 1 stop
• 10h 8m
Oct 08
The cheapest one way flight from St Louis to Washington (STL-IAD) is currently $291
Cheapest Direct Flight
$305
United Airlines
• nonstop
• 3h 36m
Oct 21
The cheapest nonstop flight from St Louis to Washington (STL-IAD) is currently $305
Fastest Flight
3h 20m
The fastest nonstop flight from St Louis to Washington (STL-IAD) takes 3h 20m
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.
Oct 21 - Oct 23, Economy
St Louis → Washington
6h 51m
6:05 PM - 11:16 PM • 1 stop
St Louis → Washington
5h 56m
10:57 AM - 1:53 PM • 1 stop
Delta Airlines
Oct 17 - Oct 19, Economy
St Louis → Washington
6h 50m
12:00 PM - 5:10 PM • 1 stop
St Louis → Washington
6h 56m
5:35 PM - 8:51 PM • 1 stop
Delta Airlines
Oct 18 - Oct 18, Economy
St Louis → Washington
7h 15m
7:16 AM - 12:51 PM • 1 stop
St Louis → Washington
3h 57m
6:55 PM - 8:32 PM • nonstop
American Airlines
Oct 17 - Oct 19, Economy
St Louis → Washington
3h 36m
1:09 PM - 4:25 PM • nonstop
St Louis → Washington
3h 41m
8:20 AM - 9:41 AM • nonstop
United Airlines
Oct 18 - Oct 18, Economy
St Louis → Washington
9h 13m
9:30 AM - 4:23 PM • 1 stop
St Louis → Washington
7h 10m
7:29 PM - 10:59 PM • 1 stop
United Airlines
Explore competitive one-way airfare options for STL - IAD flights. Best suited for flexible or open-ended travel plans.
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.
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.
Oct 21 - Oct 23, Economy
St Louis → Washington
3h 36m
8:30 AM - 11:46 AM • nonstop
St Louis → Washington
3h 41m
8:20 AM - 9:41 AM • nonstop
United Airlines
Oct 17 - Oct 19, Economy
St Louis → Washington
3h 36m
1:09 PM - 4:25 PM • nonstop
St Louis → Washington
3h 41m
8:20 AM - 9:41 AM • nonstop
United Airlines
Oct 22 - Oct 25, Economy
St Louis → Washington
3h 36m
8:30 AM - 11:46 AM • nonstop
St Louis → Washington
3h 55m
8:40 AM - 10:15 AM • nonstop
United Airlines
Oct 18 - Oct 18, Economy
St Louis → Washington
3h 36m
8:30 AM - 11:46 AM • nonstop
St Louis → Washington
3h 46m
5:55 PM - 7:21 PM • nonstop
United Airlines
Oct 13 - Oct 16, Economy
St Louis → Washington
3h 20m
11:25 AM - 2:25 PM • nonstop
St Louis → Washington
3h 45m
8:00 AM - 9:25 AM • nonstop
Southwest 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 7:00 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 AS : USD 1127
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 6:30 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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