Cheap Flight Tickets from St Louis (STL) to Washington (IAD), Starting at $499

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

$509

UA United Airlines • nonstop • 3h 26m

Sep 01 – Sep 06

The cheapest round trip flight from St Louis to Washington (STL-IAD-STL) is currently $509

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Cheapest Direct Flight

$499

UA United Airlines • nonstop • 3h 34m

Sep 01

The cheapest nonstop flight from St Louis to Washington (STL-IAD) is currently $499

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Fastest Flight

3h 26m

The fastest nonstop flight from St Louis to Washington (STL-IAD) takes 3h 26m

Top Airlines Flying from St Louis to Washington

Delta Airline, DL

Delta Airlines

United Airlines, UA

United Airlines

American Airlines, AA

American Airlines

Alaska Airlines -AS

Alaska Airlines

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.

Sep 01 - Sep 06, Economy
UA
St Louis → Washington
3h 26m
1:00 PM - 4:06 PM • nonstop
UA
St Louis → Washington
10h 1m
6:15 AM - 11:16 AM • 1 stop
$509
United Airlines
Sep 01 - Sep 06, Economy
UA
St Louis → Washington
7h 5m
8:30 AM - 1:55 PM • 1 stop
UA
St Louis → Washington
8h 42m
10:35 AM - 2:57 PM • 1 stop
$518
United Airlines
Sep 01 - Sep 06, Economy
AA
St Louis → Washington
15h 34m
10:22 AM - 8:56 PM • 1 stop
AA
St Louis → Washington
10h 23m
6:33 AM - 11:56 AM • 1 stop
$524
American Airlines
Sep 01 - Sep 06, Economy
DL
St Louis → Washington
11h 45m
6:00 AM - 2:05 PM • 1 stop
DL
St Louis → Washington
7h
6:00 AM - 9:20 AM • 1 stop
$588
Delta Airlines
Sep 01 - Sep 06, Economy
AS
St Louis → Washington
27h 3m
6:36 AM - 11:59 PM • 2 stops
AS
St Louis → Washington
20h 38m
7:00 AM - 6:38 PM • 1 stop
$1530
Alaska Airlines
Sep 01 - Sep 06, Economy
AS
St Louis → Washington
33h 24m
8:36 AM - 5:40 AM • 2 stops
AS
St Louis → Washington
20h 38m
7:00 AM - 6:38 PM • 1 stop
$1530
Alaska Airlines

Fly from St Louis to Washington with the Best Airfare Deals on FareLeaders

Looking for a cheap last-minute deal or the best round-trip flight from St Louis to Washington? Find the biggest savings on one-way and round-trip tickets right here.

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 6:00 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 AA : USD 524
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 1:00 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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