IAD to STL (Washington to St. Louis) Flights

Last Minute Flights from IAD to STL

Best airfare and ticket deals for IAD to STL flights are based on recent deals found by Expedia.com customers within the past 7 days.

OriginDestinationTravel DatesFlights From*
IADSt. LouisApril 20 to April 30$457
*Prices include taxes and fees

Cheapest IAD to STL Flights

Best airfare and ticket deals for IAD to STL flights are based on recent deals found by Expedia.com customers within the past 7 days.

OriginDestinationTravel DatesFlights From*
IADSt. LouisMay 26 to June 4$177
IADSt. LouisFebruary 9 to February 11$209
IADSt. LouisAugust 31 to September 1$225
IADSt. LouisJune 7 to June 9$343
*Prices include taxes and fees
IAD to STL Flight Details
Origin airport
Washington Dulles Intl.
Origin airport IATA code
IAD
Destination airport
Lambert-St. Louis Intl.
Destination airport IATA code
STL
Distance
694 mi

Frequently asked questions

Which airlines with flights from IAD to Lambert-St. Louis International Airport allow free cancellation due to COVID-19?
Most reputable airlines are now offering airfares with more flexibility so you can plan your journey to STL with confidence. To see which carriers have these kinds of tickets, use our convenient filter tool. Simply check the “No change fee” box directly underneath the “Flexible change policies” heading. Also read the ticket’s terms and conditions so you understand what COVID-19 related changes are allowed.
What airlines fly direct from Washington, DC Airport (IAD-Washington Dulles Intl.) to St. Louis, MO Airport (STL-Lambert-St. Louis Intl.)?
Enjoy a worry-free travel experience from takeoff to landing on board United Airlines (UA). This reputable carrier offers 91 nonstop flights on the route from IAD to St. Louis, MO Airport (STL-Lambert-St. Louis Intl.) every month.
How many flights are there from IAD to STL?
Approximately 49 per day. If you’re in a rush to reach St. Louis, see if you can nab a good last-minute deal from Washington, DC Airport (IAD-Washington Dulles Intl.) to St. Louis, MO Airport (STL-Lambert-St. Louis Intl.) and then reserve it straight away!
How long does it take to fly from Washington, DC Airport (IAD-Washington Dulles Intl.) to St. Louis, MO Airport (STL-Lambert-St. Louis Intl.)?
While you won’t be buckled in your seat for too long from Washington, DC Airport (IAD-Washington Dulles Intl.) to St. Louis, MO Airport (STL-Lambert-St. Louis Intl.), 5 hours and 8 minutes isn’t exactly a short ride either. Contemplate upgrading your ticket if you’d like the comfort of extra legroom.
What is the flight distance from Washington, DC Airport (IAD-Washington Dulles Intl.) to St. Louis, MO Airport (STL-Lambert-St. Louis Intl.)?
The short-haul flight from Loudoun County to St. Louis is a swift 700 miles (1100 km). Don’t get too relaxed though — you’ll be touching down at St. Louis, MO Airport (STL-Lambert-St. Louis Intl.) not long after taking off!
How many morning flights are there from IAD to STL?
With about 137 morning flights a week from IAD to STL to take your pick of, you’ll be hopping out of bed and jetting off in no time at all.
  • If you’d like to travel with United Airlines (UA), it operates 49 weekly services that set off before noon. The 6:30AM flight is the first one of the day.
  • 6:10AM is the earliest time you can jet from IAD to STL with Delta (DL). This company has 48 early flights per week.
  • Secure a seat with American Airlines (AA) and you’ll have 24 morning flights to choose between. The earliest departure time is 5:00AM.
How many afternoon flights are there from IAD to STL?
If the words “crack of dawn” just aren’t part of your daily vocab, jump aboard one of the 207 weekly afternoon and evening flights from IAD to STL.
  • Grab a fare with United Airlines (UA), which has 95 flights every week that jet off after midday. 12:30PM is the earliest of those departures.
  • You can also pick from the 46 afternoon and evening flights with Delta (DL) every week. 12:25PM is the first scheduled departure from IAD.
  • Or else fly out from 12:19PM onward with American Airlines (AA). This airline has 34 afternoon and evening flights a week.
What is the earliest departure time out of Loudoun County to St. Louis?
The earliest flight sets off from IAD at 5:00AM and touches down at 6:22PM at STL. Be sure to allow yourself adequate time in the morning to easily get to the check-in counter.
What is the latest departure time out of Loudoun County to St. Louis?
The last flight departs IAD at 10:30PM and lands at STL at 7:26PM. You’ll have more than enough time to prepare for this flight.
What is the average price from Loudoun County to St. Louis?
Flights from IAD to STL can be found for around $177. You’ll want to get a move on, because fares this hot wait for no one! This price was available on Flights.com within the past 7 days, for flights departing within the next year. Prices and availability are subject to change. Additional terms apply.

Washington to St. Louis Flight Schedule

CarrierFlightDepart IADArrive STLWed
4/17
Thu
4/18
Fri
4/19
Sat
4/20
Sun
4/21
Mon
4/22
Tue
4/23
Stops
UA442708:32 am09:59 amCheck FareCheck FareCheck FareCheck FareCheck FareCheck FareCheck Fare
0 Stops
UA452705:50 pm07:19 pmCheck FareCheck FareCheck FareCheck FareCheck FareCheck FareCheck Fare
0 Stops

Washington to St. Louis Flights

Whether it’s for an obligation or the sake of your sanity, sometimes you need to get away. Maybe you need flights from Washington to St. Louis to attend your cousin’s wedding, to pitch a business idea to your boss, or perhaps simply to treat yourself to a mini vacation. Regardless of the reasons behind packing your bags and needing to find the cheapest flights from IAD to STL, we’ve got you covered here at Flights.com.

We present you with some of the hottest deals on airfare so stop that Google flights search. We want you to spend less on your flight from Washington to St. Louis, so you can spend more during your getaway. With Flights.com, you’ll find it simple to land airline tickets with itineraries matching your travel schedule. What’s more, we provide you with all the information you need to confidently make reservations on your family, business, or personal trip.