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132 € Cheap Flights from Washington Dulles to St Louis

Compare Washington Dulles to St Louis flight deals

Find the cheapest month or even day of the year to fly to St Louis

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Flight deals from Washington Dulles to St Louis

Looking for a cheap last-minute deal or the best return flight from Washington Dulles Airport to St Louis Airport? If you want to travel next month, return fares start from 132 €. Find the lowest prices on one-way and return tickets right here.
St Louis.132 € per passenger.Departing Fri, 21 Aug, returning Sun, 23 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Fri, 21 Aug, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 23 Aug, arriving in Washington Dulles.Price includes taxes and charges.From 132 €, select.
St Louis.137 € per passenger.Departing Wed, 9 Sep, returning Fri, 11 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Wed, 9 Sep, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 11 Sep, arriving in Washington Dulles.Price includes taxes and charges.From 137 €, select.
St Louis.143 € per passenger.Departing Tue, 6 Oct, returning Tue, 27 Oct.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Tue, 6 Oct, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Tue, 27 Oct, arriving in Washington Dulles.Price includes taxes and charges.From 143 €, select.
St Louis.145 € per passenger.Departing Fri, 24 Jul, returning Mon, 27 Jul.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Fri, 24 Jul, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Mon, 27 Jul, arriving in Washington Dulles.Price includes taxes and charges.From 145 €, select.
St Louis.157 € per passenger.Departing Thu, 23 Jul, returning Sun, 9 Aug.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Thu, 23 Jul, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Sun, 9 Aug, arriving in Washington Dulles.Price includes taxes and charges.From 157 €, select.
St Louis.207 € per passenger.Departing Thu, 27 Aug, returning Wed, 2 Sep.Return flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from Washington Dulles on Thu, 27 Aug, arriving in St Louis.Inbound indirect flight with Frontier Airlines, departs from St Louis on Wed, 2 Sep, arriving in Washington Dulles.Price includes taxes and charges.From 207 €, select.
St Louis.258 € per passenger.Departing Thu, 10 Dec, returning Wed, 16 Dec.Return flight with Delta.Outbound indirect flight with Delta, departs from Washington Dulles on Thu, 10 Dec, arriving in St Louis.Inbound indirect flight with Delta, departs from St Louis on Wed, 16 Dec, arriving in Washington Dulles.Price includes taxes and charges.From 258 €, select.
St Louis.259 € per passenger.Departing Tue, 24 Nov, returning Tue, 1 Dec.Return flight with Delta.Outbound indirect flight with Delta, departs from Washington Dulles on Tue, 24 Nov, arriving in St Louis.Inbound indirect flight with Delta, departs from St Louis on Tue, 1 Dec, arriving in Washington Dulles.Price includes taxes and charges.From 259 €, select.
St Louis.284 € per passenger.Departing Thu, 31 Dec, returning Thu, 14 Jan.Return flight with United.Outbound indirect flight with United, departs from Washington Dulles on Thu, 31 Dec, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Thu, 14 Jan, arriving in Washington Dulles.Price includes taxes and charges.From 284 €, select.
St Louis.287 € per passenger.Departing Sat, 22 Aug, returning Sun, 23 Aug.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Sat, 22 Aug, arriving in St Louis.Inbound direct flight with United departs from St Louis on Sun, 23 Aug, arriving in Washington Dulles.Price includes taxes and charges.From 287 €, select.
St Louis.293 € per passenger.Departing Tue, 24 Nov, returning Sat, 28 Nov.Return flight with Delta.Outbound indirect flight with Delta, departs from Washington Dulles on Tue, 24 Nov, arriving in St Louis.Inbound indirect flight with Delta, departs from St Louis on Sat, 28 Nov, arriving in Washington Dulles.Price includes taxes and charges.From 293 €, select.
St Louis.293 € per passenger.Departing Thu, 14 Jan, returning Mon, 18 Jan.Return flight with Delta.Outbound indirect flight with Delta, departs from Washington Dulles on Thu, 14 Jan, arriving in St Louis.Inbound indirect flight with Delta, departs from St Louis on Mon, 18 Jan, arriving in Washington Dulles.Price includes taxes and charges.From 293 €, select.
St Louis.303 € per passenger.Departing Sat, 30 Jan, returning Fri, 12 Feb.Return flight with Delta.Outbound indirect flight with Delta, departs from Washington Dulles on Sat, 30 Jan, arriving in St Louis.Inbound indirect flight with Delta, departs from St Louis on Fri, 12 Feb, arriving in Washington Dulles.Price includes taxes and charges.From 303 €, select.
St Louis.319 € per passenger.Departing Wed, 22 Jul, returning Sat, 25 Jul.Return flight with United.Outbound direct flight with United departs from Washington Dulles on Wed, 22 Jul, arriving in St Louis.Inbound direct flight with United departs from St Louis on Sat, 25 Jul, arriving in Washington Dulles.Price includes taxes and charges.From 319 €, select.
St Louis.324 € per passenger.Departing Fri, 30 Oct, returning Sun, 1 Nov.Return flight with United.Outbound indirect flight with United, departs from Washington Dulles on Fri, 30 Oct, arriving in St Louis.Inbound indirect flight with United, departs from St Louis on Sun, 1 Nov, arriving in Washington Dulles.Price includes taxes and charges.From 324 €, select.
St Louis.337 € per passenger.Departing Sat, 25 Jul, returning Tue, 15 Dec.Return flight with Delta.Outbound indirect flight with Delta, departs from Washington Dulles on Sat, 25 Jul, arriving in St Louis.Inbound indirect flight with Delta, departs from St Louis on Tue, 15 Dec, arriving in Washington Dulles.Price includes taxes and charges.From 337 €, select.

Find the cheapest month to fly from Washington Dulles to St Louis

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Washington Dulles to St Louis flights are currently cheapest in August.
Jul
from 145 €
Aug
from 132 €
Sep
from 137 €
Oct
from 143 €
Nov
from 293 €
Dec
from 258 €
Jan
from 293 €
Feb
Find prices
Mar
from 349 €
Apr
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May
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Jun
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Direct flights from Washington Dulles to St Louis

Washington Dulles to St Louis: Alternative routes

Compare routes from Washington Dulles to St Louis below. You may find an airport to fly into that's cheaper, faster, or easier than St Louis.

St Louis

20km from central St Louis
ClosestCheapest
from 132 €
Search flights

Belleville

32km from central St Louis
from 269 €
Search flights

Washington D.C. to St Louis: Flight information

The things to know before you go.
Cheapest flight found132 €
Cheapest month to flyAugust
Average flight time2 hrs, 26 mins
Most popular airlineUnited
Average flights per week73

Finding cheap flights from Washington Dulles to St Louis: Frequently asked questions

The best price we found for a return flight from Washington Dulles to St Louis is 132 €. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
2 hours and 26 minutes is the average flight time from Washington Dulles to St Louis.
United, GoJet Airlines and Lufthansa fly direct from Washington Dulles to St Louis.
As of July 2026, there are 73 flights per week flying from Washington Dulles to St Louis.
The cheapest month to fly from Washington Dulles to St Louis is usually August.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Washington Dulles Airport to St Louis Airport on Friday, 21 August 2026.
Yes – the average flight time is 2 hours and 26 minutes.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to St Louis but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.

We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to St Louis is around 40 days in advance, so don’t leave your flight to the last minute.

Currently, Frontier Airlines and United offer the cheapest flight tickets to St Louis.

Travelling from Washington Dulles Airport (IAD) to St Louis Airport (STL): what you need to know

  • Take a direct flight from Washington Dulles Airport to St Louis Airport and you'll be travelling for an average of 2 hours 25 minutes.

  • St Louis's timezone is UTC-6, which makes St Louis one hour behind Washington DC.

  • Every week, there are 14 Washington Dulles Airport to St Louis Airport flights. If you'd like to get going early, jump on the 08:20 United Airlines flight. If you're eager to make the most of your day before you fly, the last departure is at 17:55 with United Airlines.

  • Give yourself enough time to make your IAD to STL flight. As a rule of thumb, arrive two hours before international departures and an hour ahead for domestic flights.

  • During popular months like July, it's best to get to the airport earlier than normal. Plan to arrive two hours before domestic departures and four hours ahead of an international flight whenever you're flying during peak periods in general.

  • Travelling to St Louis (and then discovering more of the United States!) is a snap with United. This popular carrier offers direct flights from Washington Dulles Airport to St Louis Airport.

  • United is the airline with the highest passenger demand for this route.

  • With 71.79% of its services arriving as planned, United is the most punctual carrier offering IAD to STL flights.

  • We make it easy to book a flight with a stopover. To see all your options for tickets from Washington Dulles Airport to St Louis Airport, uncheck 'Direct flights only.' Then, choose a flight that has a stop long enough to visit your chosen city. Top stopovers between IAD and STL include:

    • Detroit Wayne County Airport

    • Pittsburgh International Airport

    • Cleveland Hopkins International Airport

How to find the cheapest flights from Washington Dulles Airport (IAD) to St Louis Airport (STL)

  • 60 € is the lowest price for a one-way Washington Dulles Airport to St Louis Airport flight. A return flight starts at 132 €. These prices may change based on availability.

  • It's a good idea to book in advance if you're looking for cheap tickets from IAD to STL. That's because airlines adjust prices based on demand, which tends to increase closer to the date of departure.

  • The cheapest month for flights from Washington Dulles Airport to St Louis Airport is May. Use the 'Whole month' tool to find the lowest airfares if you have a flexible travel schedule.

  • Finding cheap flights from IAD to STL couldn't be easier with Price Alerts. All you need to do is set up one of these automatic alerts and we'll let you know as soon as a new deal comes up.

  • Lock in the perfect flight for you by using the filters. To see the 'Fastest,' 'Cheapest' or 'Best' flights from Washington Dulles Airport to St Louis Airport, use the 'Sort by' tool. You can also filter results by departure and arrival times, airline, and journey duration.

Handy information about Washington Dulles Airport (IAD)

Arriving at St Louis Airport (STL)

Getting from St Louis Airport (STL) to central St Louis

  • STL is located at 10701 Lambert International Blvd..

  • St Louis Airport is roughly 24 kilometres from the centre of St Louis. Driving there takes about 25 minutes.

  • If you're taking public transport, expect a journey time of about 30 minutes.

When to fly to St Louis Airport (STL)

  • July is the busiest month for flights from Washington Dulles Airport to St Louis Airport. To escape the crowds, travel to St Louis in March.

  • When reserving your flight from Washington Dulles Airport to St Louis Airport, consider the type of weather you like. July is the warmest month in St Louis, with temperatures ranging from 17ºC (63ºF) to 33ºC (91ºF).

  • January has average temperatures of between -7ºC (19ºF) and 8ºC (46ºF). Search for cheap tickets from IAD to STL around that time if you want to travel in cooler conditions.

Explore more of the United States

  • Chicago is just one of the many places in the United States waiting to be explored once you've taken in the sights of St Louis. Around 418 kilometres away to the north-east, its best attractions include Millennium Park, Art Institute of Chicago and Willis Tower.

  • If you're looking to explore another great destination in the United States, consider Indianapolis, roughly 370 kilometres east of St Louis. Lucas Oil Stadium, Eiteljorg Museum and The Children's Museum of Indianapolis are among the biggest draws.

Plan the rest of your trip from Washington D.C. to St Louis

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.