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Flights Fare Calendar Find minimum fare between Lambert-St. Louis Intl. and Washington Dulles Intl. Click this button to get previous days data Click this button to get next days data $433 $371 $309 $247 $186 $124 $62 $0 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 1 2 3 4 5 6 7 8 9 10 11 12 T F S S M T W T F S S M T W T F S S M T W T F S S M T W T F S Price is $299 on American Airlines Price is $294 on United Price is $284 on United Price is $284 on United Price is $284 on United Price is $284 on United Price is $299 on American Airlines Price is $398 on American Airlines Price is $302 on Delta Price is $306 on Southwest Airlines Price is $255 on United Price is $239 on United Price is $297 on American Airlines Price is $358 on United Price is $433 on Delta Price is $289 on Delta Price is $290 on Southwest Airlines Price is $301 on Southwest Airlines Price is $290 on Southwest Airlines Price is $271 on United Price is $280 on United Price is $341 on Southwest Airlines Price is $280 on United Price is $348 on United Price is $271 on United Price is $271 on United Price is $280 on United Price is $280 on United Price is $280 on United Price is $271 on United

Amazing STL to IAD Flight Deals

The cheapest flights to Washington Dulles Intl. found within the past 7 days were $157 round trip and $79 one way. Prices and availability subject to change. Additional terms may apply.

Flight Schedule for STL to IAD

Carrier Flight Depart STL Arrive IAD Fri
5/14
Sat
5/15
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5/16
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5/17
Tue
5/18
Wed
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Thu
5/20
Stops
UA 4834 06:15 am 09:21 am Check fare Check fare Check fare Check fare Check fare Check fare Check fare 0 stop(s)
UA 4363 12:45 pm 03:50 pm Check fare Check fare Check fare Check fare Check fare Check fare Check fare 0 stop(s)
UA 2546 06:35 pm 09:30 pm - - - Check fare - - - 0 stop(s)

Best Washington Dulles Intl. Flight and Hotel Packages

Washington Dulles Intl. flight + hotel packages - economy flights

FAQs about flights from Lambert-St. Louis Intl. Airport (STL) to Washington Dulles Intl. Airport (IAD)

Can I catch a flight from St. Louis, MO Airport (STL-Lambert-St. Louis Intl.) to Washington, DC Airport (IAD-Washington Dulles Intl.) right now?

For information on any current Washington, DC Airport (IAD-Washington Dulles Intl.) travel advice and quarantine requirements, visit the Covid-19 Travel Advisor. Look before you arrange your flight, so you don't get caught out en route.

Are there direct flights from St. Louis Lambert International Airport to IAD?

If you'd rather avoid layovers, it's wise to organize your flight from Lambert-St. Louis Intl. Airport (STL) to IAD as early as possible. United Airlines is the only airline that offers direct flights to Washington from St. Louis.

If I am not able to travel due to COVID-19, can I change my booking to a later date?

For more info about changing your flight to Dulles Intl. Airport, please visit our Customer Service Portal.

How long is the flight from St. Louis, MO Airport (STL-Lambert-St. Louis Intl.) to IAD?

Flights between St. Louis and Washington take approximately 4 hours and 34 minutes all up. Make the most of that time in the air by reading, napping, exploring the in-flight entertainment or doing all three.

What is the flight distance from Lambert Field to IAD?

There's a flight distance of 1,616 mi separating STL and IAD. This is classified as a medium-haul flight. There'll be lots of time to get engrossed in the in-flight entertainment and fit in a little sleep if you're feeling tired.

What airlines fly from Lambert Field to Washington Dulles Intl. Airport (IAD)?

Looking to fly nonstop from Lambert Field to IAD? You're in luck. United Airlines offers as many as 136 flights per month and is a popular option with many worldly wanderers.

What is the best day to buy a plane ticket?

This just in! Airfares offered on Thursdays tend to be the cheapest, according to flight demand on Travelocity in 2020. Wednesday and Friday prices are also good, but you may want to prepare your budget if booking on a Sunday, as data shows the end of the week is when prices are generally at their highest.

What are the cheapest days to fly?

Frequent travelers may already know this, but earlier in the week can be the cheapest time to fly. In 2020, flights departing on a Monday were generally the cheapest of the week, whereas you may pay a premium for weekend flights when demand is usually high. On average, tickets were most expensive for Saturday departures, so if you need to fly out on a weekend, you might look for deals ahead of time.

How far in advance can you book a flight?

Trying to figure out how early you should book your flight? It's possible to start comparing international airfares on Travelocity up to 12 months in advance. However, it does depend on the carrier as not all airlines release their prices that far out. According to our 2020 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 2 weeks to 2 months prior to their travel dates.

How can I save money on airline tickets?

We'll let you in on a secret...You can save big on flights if you mix and match your airlines and fare types. In fact, travelers who booked flights on Travelocity in 2020 saved nearly 40% when their return flights consisted of two different airlines or fare types.

*According to flight demand on Travelocity.com from January to December 2020. Savings are subject to change based on departure location, date and destination.

Lambert-St. Louis Intl. to Washington Dulles Intl. Flight FAQ

Traveling FromLambert-St. Louis Intl.
Traveling ToWashington Dulles Intl.
Shortest Flight Time2 hours 5 mins
Earliest Departure Time5:35AM CDT
Latest Departure Time12:45PM CDT
Lowest Flight Price$157

Route Info

Flight path for flights from Lambert-St. Louis International Airport to Washington Dulles International Airport.


Distance:
698.00 miles

Airline carriers and aircraft used on flights from STL to IAD


Airline Carrier
Aircraft
United Airlines
Fokker 100

Popular Flight Routes from St. Louis (STL)

Travelers at STL love to visit these top cities. Roam to the top destinations from St. Louis (STL) today with the cheap prices from Travelocity!

Popular Flight Routes from Washington (IAD)

Travelers at IAD love to visit these top cities. Roam to the top destinations from Washington(IAD) today with the cheap prices from Travelocity!

*Price based on the lowest price found within past 24 hours and based upon one night stay for two adults over the next thirty days. Prices and availability subject to change. Additional terms may apply.