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Uncover the best deals on Washington to St Louis flights by comparing fares from hundreds of airlines and agencies.
Good to Know: Cheapest and Fastest IAD - STL Flights
Useful information for finding best airline tickets from Washington Dulles International to Lambert St Louis International on your next trip.
Cheapest Round Trip Flight
$384
Delta Airlines
• 1 stop
• 7h 17m
Apr 15 – Apr 22
The cheapest round trip flight from Washington to St Louis (IAD-STL-IAD) is currently $384
Cheapest Direct Flight
$248
Southwest Airlines
• nonstop
• 3h 45m
Apr 15
The cheapest nonstop flight from Washington to St Louis (IAD-STL) is currently $248
Fastest Flight
3h 40m
The fastest nonstop flight from Washington to St Louis (IAD-STL) takes 3h 40m
Latest Flight Deals from Washington (IAD) to St Louis (STL)
Compare and book low fare round-trip air tickets from Washington to St Louis. Ideal for travelers with confirmed return itineraries.
Apr 15 - Apr 22, Economy
Washington → St Louis
7h 17m
5:00 PM - 8:37 PM • 1 stop
Washington → St Louis
8h 55m
11:51 AM - 6:26 PM • 1 stop
Delta Airlines
Apr 15 - Apr 16, Economy
Washington → St Louis
12h 20m
6:00 AM - 12:40 PM • 1 stop
Washington → St Louis
7h 20m
5:20 PM - 11:00 PM • 1 stop
United Airlines
Apr 15 - Apr 15, Economy
Washington → St Louis
12h 38m
6:00 AM - 12:58 PM • 1 stop
Washington → St Louis
10h 5m
5:15 PM - 12:20 AM • 1 stop
Delta Airlines
Apr 15 - Apr 22, Economy
Washington → St Louis
8h 37m
6:10 AM - 10:27 AM • 1 stop
Washington → St Louis
3h 26m
8:25 AM - 11:31 AM • nonstop
United Airlines
Apr 15 - Apr 15, Economy
Washington → St Louis
13h 30m
6:10 AM - 1:20 PM • 1 stop
Washington → St Louis
6h 55m
7:05 PM - 12:20 AM • 1 stop
Delta Airlines
Looking for the fastest way to St Louis? These direct flight options from IAD to STL offer both convenience and value—no layovers, just straight to your destination.
Apr 15 - Apr 22, Economy
Washington → St Louis
3h 45m
2:40 PM - 4:05 PM • nonstop
Washington → St Louis
2h 35m
7:40 PM - 10:35 PM • nonstop
Southwest Airlines
Apr 15 - Apr 22, Economy
Washington → St Louis
3h 45m
8:20 AM - 9:45 AM • nonstop
Washington → St Louis
2h 35m
7:40 PM - 10:35 PM • nonstop
Southwest Airlines
Apr 15 - Apr 22, Economy
Washington → St Louis
3h 40m
12:30 PM - 1:50 PM • nonstop
Washington → St Louis
2h 35m
7:40 PM - 10:35 PM • nonstop
Southwest Airlines
Apr 15 - Apr 22, Economy
Washington → St Louis
3h 40m
9:50 PM - 11:10 PM • nonstop
Washington → St Louis
2h 35m
7:40 PM - 10:35 PM • nonstop
Southwest Airlines
Apr 15 - Apr 22, Economy
Washington → St Louis
3h 43m
5:15 PM - 6:38 PM • nonstop
Washington → St Louis
3h 26m
8:25 AM - 11:31 AM • nonstop
United Airlines
FAQs on Washington to St Louis Flights
What are the airports in Washington?
IAD,BWI,DCA
What’s the most popular airline flying from IAD to STL?
The most popular airline flying from Washington to St Louis are
Can I fly from IAD to STL non-stop?
Yes, you can fly IAD to STL non-stop on
Which airlines fly nonstop between Washington and St Louis?
The non-stop flights between Washington and St Louis are .
What’s the earliest departure time from IAD to STL Airport?
The earliest flight leaves IAD at 6:00 am and lands in STL - Lambert St Louis International
What are the airports in St Louis?
STL
Can I make changes to my Washington to St Louis 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 IAD to STL?
Read the fare rules of the Washington to St Louis 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 Washington and St Louis?
operate flights between Washington and St Louis
How long does a flight from Washington to St Louis take?
It takes approximately 2 hour to fly non-stop from IAD to STL, which is 696.18 miles by air.
Which airlines provide the cheapest flights from Washington (IAD) to St Louis (STL) ?
In the past couple of days, the cheapest tickets to STL from IAD were found on DL : USD 714
Do I need a passport to fly between IAD and STL?
No
What’s the latest departure time from IAD to STL ?
The last flight leaves IAD at 9:50 pm
Washington (IAD) to St Louis (STL): Airport Information
| Origin Airport | Washington Dulles International , Washington, US |
| Destination Airport | Lambert St Louis International , St Louis, US |
| Distance | 696 miles |
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