Cheap Flights from St Louis to Washington Dulles

Compare St Louis to Washington Dulles flight deals

Find the cheapest month or even day of the year to fly to Washington Dulles

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Flight deals from St Louis to Washington Dulles

Looking for a cheap last-minute deal or the best return flight from St Louis Airport to Washington Dulles Airport? If you want to travel next month, return fares start from Rs41,975. Find the lowest prices on one-way and return tickets right here.

Washington D.C..Rs18,598 per passenger.Departing Fri, 21 Aug.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Fri, 21 Aug, arriving in Washington Dulles.Price includes taxes and charges.From Rs18,598, select.

Washington D.C..Rs18,617 per passenger.Departing Thu, 17 Sep.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Thu, 17 Sep, arriving in Washington Dulles.Price includes taxes and charges.From Rs18,617, select.

Washington D.C..Rs19,042 per passenger.Departing Thu, 8 Oct.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Thu, 8 Oct, arriving in Washington Dulles.Price includes taxes and charges.From Rs19,042, select.

Washington D.C..Rs20,369 per passenger.Departing Tue, 10 Nov.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Tue, 10 Nov, arriving in Washington Dulles.Price includes taxes and charges.From Rs20,369, select.

Washington D.C..Rs30,619 per passenger.Departing Thu, 3 Dec.One-way flight with Delta.Outbound indirect flight with Delta, departs from St Louis on Thu, 3 Dec, arriving in Washington Dulles.Price includes taxes and charges.From Rs30,619, select.

Washington D.C..Rs32,914 per passenger.Departing Tue, 11 Aug.One-way flight with United.Outbound direct flight with United departs from St Louis on Tue, 11 Aug, arriving in Washington Dulles.Price includes taxes and charges.From Rs32,914, select.

Washington D.C..Rs33,587 per passenger.Departing Tue, 28 Jul.One-way flight with Frontier Airlines.Outbound indirect flight with Frontier Airlines, departs from St Louis on Tue, 28 Jul, arriving in Washington Dulles.Price includes taxes and charges.From Rs33,587, select.

Washington D.C..Rs38,852 per passenger.Departing Tue, 15 Dec.One-way flight with United.Outbound direct flight with United departs from St Louis on Tue, 15 Dec, arriving in Washington Dulles.Price includes taxes and charges.From Rs38,852, select.

Washington D.C..Rs43,197 per passenger.Departing Wed, 14 Oct.One-way flight with United.Outbound direct flight with United departs from St Louis on Wed, 14 Oct, arriving in Washington Dulles.Price includes taxes and charges.From Rs43,197, select.

Washington D.C..Rs51,740 per passenger.Departing Fri, 4 Sep.One-way flight with United.Outbound direct flight with United departs from St Louis on Fri, 4 Sep, arriving in Washington Dulles.Price includes taxes and charges.From Rs51,740, select.

Washington D.C..Rs53,679 per passenger.Departing Tue, 10 Nov.One-way flight with United.Outbound direct flight with United departs from St Louis on Tue, 10 Nov, arriving in Washington Dulles.Price includes taxes and charges.From Rs53,679, select.

Washington D.C..Rs63,118 per passenger.Departing Sat, 25 Jul.One-way flight with United.Outbound direct flight with United departs from St Louis on Sat, 25 Jul, arriving in Washington Dulles.Price includes taxes and charges.From Rs63,118, select.

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

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like St Louis to Washington Dulles flights are currently cheapest in August.

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Direct flights from St Louis to Washington Dulles

St Louis to Washington Dulles: Alternative routes

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

St Louis to Washington D.C.: Flight information

The things to know before you go.

Cheapest flight found	Rs18,598
Cheapest month to fly	August
Average flight time	2 hrs, 10 mins
Most popular airline	Lufthansa
Average flights per week	65

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

How much are return flights from St Louis to Washington Dulles?

The best price we found for a return flight from St Louis to Washington Dulles is Rs37,916. 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.

How long does it take to fly from St Louis to Washington Dulles?

2 hours and 10 minutes is the average flight time from St Louis to Washington Dulles.

Which airlines fly direct from St Louis to Washington Dulles?

Lufthansa, United and GoJet Airlines fly direct from St Louis to Washington Dulles.

How many flights are there a week from St Louis to Washington Dulles?

As of July 2026, there are 65 flights per week flying from St Louis to Washington Dulles.

When is the cheapest time to fly from St Louis to Washington Dulles?

The cheapest month to fly from St Louis to Washington Dulles is usually September.

Which upcoming date is cheapest to fly from St Louis Airport to Washington Dulles Airport on?

After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from St Louis Airport to Washington Dulles Airport on Monday, 28 September 2026.

Can I get a direct flight from St Louis Airport to Washington Dulles Airport?

Yes – the average flight time is 2 hours and 11 minutes.

How can I find the best flight deal to Washington Dulles?

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 Washington Dulles 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.

When is the best time to book flights to Washington D.C.?

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

Which is the cheapest airline to fly from St Louis Airport to Washington Dulles with?

Currently, Frontier Airlines and United offer the cheapest flight tickets to Washington Dulles.

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

Around 2 hours 10 minutes is how long you can expect to be in the air on a direct flight from St Louis Airport to Washington Dulles Airport.
The timezone in Washington DC is UTC-5, which is one hour ahead of St Louis.
Each week, there are 14 St Louis Airport to Washington Dulles Airport flights. If you prefer to take off as early as possible, opt for the 08:15 United Airlines flight. If you'd rather make the most of your time before you fly, the last flight is at 13:00 with United Airlines.
For a smooth journey, turn up at the airport two hours ahead of international flights and an hour before domestic departures. This will give you plenty of time to catch your STL to IAD flight.
Flying during a peak month like July? Major public holidays and other popular seasons can lead to longer lines and delays at security. Play it safe and arrive up to four hours ahead of an international flight and two hours before a domestic departure.
United is your gateway to discovering Washington DC (and perhaps some other great corners of the United States!). Check out the direct flights from St Louis Airport to Washington Dulles Airport offered by this popular airline.
Most travellers choose to travel with United on this route.
United is the most punctual carrier that operates STL to IAD flights, with 70.43% of its services landing on time.
Consider adding a stopover when booking your ticket from St Louis Airport to Washington Dulles Airport. Simply uncheck 'Direct flights only' to break up your journey, or maybe even explore a new city along the way. Check out these options between STL and IAD:
- Atlanta Hartsfield-Jackson Airport
- Detroit Wayne County Airport
- Nashville Airport

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

Rs18,598 is currently the best price for a one-way St Louis Airport to Washington Dulles Airport flight. Return flights start at Rs37,916. These prices may change depending on demand.
To score cheap tickets from STL to IAD, reserve your journey one month ahead of your planned departure.
The cheapest month for flights from St Louis Airport to Washington Dulles Airport is June. Use the 'Whole month' tool to find the lowest prices if you have flexible dates.
Picking up cheap flights from STL to IAD is a piece of cake with Price Alerts. All you need to do is set up one of these automatic alerts and we'll get in touch as soon as a lower fare pops up.
Lock in the ideal flight for you by using the filters. To see the 'Fastest,' 'Cheapest' or 'Best' flights from St Louis Airport to Washington Dulles Airport, use the 'Sort by' function. You can also filter results by departure and arrival times, airline, and number of stops.

Handy information about St Louis Airport (STL)

You'll find STL at 10701 Lambert International Blvd..
When it comes to St Louis Airport's on-time performance, 76% of flights complete their journey on time.
St Louis Airport is around 24 kilometres from central St Louis. If you're driving, ride-sharing or catching a taxi from the centre, it'll take 25 minutes or so to get there, depending on the traffic.
You can expect a trip time of roughly 30 minutes on public transport.
Need a handy hotel close to STL? If you're boarding an early flight from St Louis Airport to Washington Dulles Airport, these stays will have you sleeping moments from your departure gate:

Arriving at Washington Dulles Airport (IAD)

If you're arriving on a late St Louis Airport to Washington Dulles Airport flight, few things beat the convenience of staying near the terminal. Collect your bags from the carousel and then be showered and snoozing soon after at one of these options near IAD:
Travel at your own pace with a Washington Dulles Airport rental car. Book your wheels from Dollar, Thrifty or Sixt and see more of Washington DC and beyond.
To lock in the lowest price, book your vehicle from Washington Dulles Airport around one week before you set off.

When to fly to Washington Dulles Airport (IAD)

It's time to work out your travel dates for your flight from St Louis Airport to Washington Dulles Airport. July is the most popular month to head to Washington DC. If you prefer a more low-key vibe, go in February.
Book your flight from St Louis Airport to Washington Dulles Airport for July if you'd like to go to Washington DC during its warmest month. Expect temperatures of between 19ºC and 33ºC.
If you want cooler conditions, look for a cheap ticket from STL to IAD in January. Average temperatures are between -6ºC and 10ºC then.

Explore more of the United States

Washington DC is always a good idea, but there are so many other parts of the United States you should also see. Around 322 kilometres north-east of Washington DC, a visit to New York will keep you on the go. Start with leading attractions like Central Park, Statue of Liberty and Metropolitan Museum of Art.
Philadelphia is another well-known destination in the United States and is around 193 kilometres north-east of Washington DC. No trip is complete without seeing Independence Hall, Liberty Bell and Philadelphia Museum of Art.