Lowest Prices
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
$247
Delta Airlines
• 1 stop
• 7h
Sep 04 – Sep 07
The cheapest round trip flight from Washington to St Louis (IAD-STL-IAD) is currently $247
Cheapest Direct Flight
$321
United Airlines
• nonstop
• 3h 34m
Sep 04
The cheapest nonstop flight from Washington to St Louis (IAD-STL) is currently $321
Fastest Flight
3h 34m
The fastest nonstop flight from Washington to St Louis (IAD-STL) takes 3h 34m
Top Airlines Flying from Washington to St Louis
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.
Sep 04 - Sep 07, Economy
Washington → St Louis
7h
6:00 AM - 9:20 AM • 1 stop
Washington → St Louis
6h 52m
6:30 AM - 11:42 AM • 1 stop
Delta Airlines
Sep 04 - Sep 07, Economy
Washington → St Louis
6h 57m
5:25 PM - 8:42 PM • 1 stop
Washington → St Louis
6h 52m
6:30 AM - 11:42 AM • 1 stop
Delta Airlines
Sep 04 - Sep 07, Economy
Washington → St Louis
6h 58m
8:28 AM - 11:46 AM • 1 stop
Washington → St Louis
7h 23m
5:30 PM - 11:13 PM • 1 stop
Delta Airlines
Sep 04 - Sep 07, Economy
Washington → St Louis
7h 7m
6:10 AM - 9:37 AM • 1 stop
Washington → St Louis
7h 23m
5:30 PM - 11:13 PM • 1 stop
Delta Airlines
Sep 04 - Sep 07, Economy
Washington → St Louis
8h 37m
10:16 AM - 2:33 PM • 1 stop
Washington → St Louis
7h 23m
5:30 PM - 11:13 PM • 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.
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 247
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 5:25 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 |
More Flight Options for Washington (IAD) and St Louis (STL)
Flights from Baltimore (BWI)
to Orlando (MCO)
Flights from Baltimore (BWI)
to Orlando (MCO)
Flights from Baltimore (BWI)
to Los Angeles (LAX)
Flights from Baltimore (BWI)
to Los Angeles (LAX)
Flights from Baltimore (BWI)
to Indianapolis (IND)
Flights from Baltimore (BWI)
to Indianapolis (IND)
Flights from Washington (DCA)
to Orlando (MCO)
Flights from Washington (DCA)
to Dallas (DFW)
Flights from Baltimore (BWI)
to Miami (MIA)
Flights from Baltimore (BWI)
to Miami (MIA)
Flights from Baltimore (BWI)
to Atlanta (ATL)
Flights from Baltimore (BWI)
to Atlanta (ATL)
Flights from Washington (IAD)
to Minneapolis (MSP)
Flights from Washington (IAD)
to Minneapolis (MSP)
Flights from Baltimore (BWI)
to San Juan (SJU)
Flights from Baltimore (BWI)
to San Juan (SJU)
Flights from Baltimore (BWI)
to Fort Lauderdale (FLL)
Flights from Baltimore (BWI)
to Fort Lauderdale (FLL)
Flights from Baltimore (BWI)
to Ontario (ONT)
Flights from Baltimore (BWI)
to Ontario (ONT)
Flights from Boston (BOS)
to St Louis (STL)
Flights from Fort Lauderdale (FLL)
to St Louis (STL)
Flights from Houston (HOU)
to St Louis (STL)
Flights from Charlotte (CLT)
to St Louis (STL)
Flights from Orlando (MCO)
to St Louis (STL)
Flights from Denver (DEN)
to St Louis (STL)
Flights from Oklahoma City (OKC)
to St Louis (STL)
Flights from Atlanta (ATL)
to St Louis (STL)
Flights from Washington (DCA)
to St Louis (STL)
Flights from Austin (AUS)
to St Louis (STL)
Flights from Dallas (DFW)
to St Louis (STL)
Flights from Phoenix (PHX)
to St Louis (STL)
Flights from Fort Myers (RSW)
to St Louis (STL)
Flights from New Orleans (MSY)
to St Louis (STL)
Flights from New York (LGA)
to St Louis (STL)
Flights from Houston (IAH)
to St Louis (STL)
Flights from Sacramento (SMF)
to St Louis (STL)
Flights from Detroit (DTW)
to St Louis (STL)
Flights from Knoxville (TYS)
to St Louis (STL)
Flights from Los Angeles (LAX)
to St Louis (STL)
Cheap flights to North America (NA)
Cheap flights to United States (US)
Cheap flights to Virginia (US-VA)
Cheap flights to Missouri (US-MO)
Cheap flights from North America (NA)
Cheap flights from United States (US)
Cheap flights from Missouri (US-MO)
Cheap flights from Virginia (US-VA)
Flights to Baltimore (BWI)
Flights to Baltimore (BWI)
Flights to Washington (DCA)
Flights to Washington (IAD)
Flights to St Louis (STL)
Flights from Baltimore (BWI)
Flights from Washington (DCA)
Flights from Washington (IAD)
Flights from St Louis (STL)
Flights from St Louis (STL)
to Baltimore (BWI)
Flights from St Louis (STL)
to Baltimore (BWI)
Flights from St Louis (STL)
to Washington (DCA)
Flights from St Louis (STL)
to Washington (IAD)
Why Fareleaders for IAD to STL Plane Tickets
New Deals Everyday
Get the best prices on IAD to STL flights—we update our fares daily so you never miss a saving.
No Service Fees
Compare hundreds of Washington to St Louis flights and secure the best deals—we never add any service fees.