$85 Cheap flights from Lambert-St. Louis Intl. to Washington Dulles Intl. (STL to IAD)

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Find The Best Dates To Fly from Lambert-St. Louis Intl. to Washington Dulles Intl.

Amazing STL to IAD Flight Deals

The cheapest flights to Washington Dulles Intl. found within the past 7 days were $169 round trip and $85 one way. Prices and availability subject to change. Additional terms may apply.

Tue, Aug 13 - Tue, Aug 20
STL
St. Louis
IAD
Washington
$169 Roundtrip, found 18 hours ago
$169
Roundtrip
found 18 hours ago
Select United flight, departing Tue, Aug 13 from St. Louis to Washington, returning Tue, Aug 20, priced at $169 found 18 hours ago
Tue, Aug 13 - Tue, Aug 20
STL
St. Louis
IAD
Washington
$179 Roundtrip, found 18 hours ago
$179
Roundtrip
found 18 hours ago
Select United flight, departing Tue, Aug 13 from St. Louis to Washington, returning Tue, Aug 20, priced at $179 found 18 hours ago
Tue, Oct 1 - Wed, Oct 16
STL
St. Louis
IAD
Washington
$182 Roundtrip, found 2 days ago
$182
Roundtrip
found 2 days ago
Select United flight, departing Tue, Oct 1 from St. Louis to Washington, returning Wed, Oct 16, priced at $182 found 2 days ago
Tue, Sep 10 - Sat, Sep 14
STL
St. Louis
IAD
Washington
$184 Roundtrip, found 1 day ago
$184
Roundtrip
found 1 day ago
Select United flight, departing Tue, Sep 10 from St. Louis to Washington, returning Sat, Sep 14, priced at $184 found 1 day ago
Tue, Jun 18 - Tue, Jul 9
STL
St. Louis
IAD
Washington
$188 Roundtrip, found 15 hours ago
$188
Roundtrip
found 15 hours ago
Select Delta flight, departing Tue, Jun 18 from St. Louis to Washington, returning Tue, Jul 9, priced at $188 found 15 hours ago
Tue, Oct 1 - Wed, Oct 16
STL
St. Louis
IAD
Washington
$191 Roundtrip, found 2 days ago
$191
Roundtrip
found 2 days ago
Select Delta flight, departing Tue, Oct 1 from St. Louis to Washington, returning Wed, Oct 16, priced at $191 found 2 days ago
Tue, Sep 10 - Sat, Sep 14
STL
St. Louis
IAD
Washington
$194 Roundtrip, found 1 day ago
$194
Roundtrip
found 1 day ago
Select United flight, departing Tue, Sep 10 from St. Louis to Washington, returning Sat, Sep 14, priced at $194 found 1 day ago
Tue, Aug 13 - Tue, Aug 20
STL
St. Louis
IAD
Washington
$198 Roundtrip, found 18 hours ago
$198
Roundtrip
found 18 hours ago
Select United flight, departing Tue, Aug 13 from St. Louis to Washington, returning Tue, Aug 20, priced at $198 found 18 hours ago
Tue, Sep 10 - Sat, Sep 14
STL
St. Louis
IAD
Washington
$203 Roundtrip, found 1 day ago
$203
Roundtrip
found 1 day ago
Select United flight, departing Tue, Sep 10 from St. Louis to Washington, returning Sat, Sep 14, priced at $203 found 1 day ago
Tue, Oct 1 - Wed, Oct 16
STL
St. Louis
IAD
Washington
$207 Roundtrip, found 2 days ago
$207
Roundtrip
found 2 days ago
Select United flight, departing Tue, Oct 1 from St. Louis to Washington, returning Wed, Oct 16, priced at $207 found 2 days ago

Flight Schedule for STL to IAD

CarrierFlightDepart STLArrive IADSat
5/25		Sun
5/26		Mon
5/27		Tue
5/28		Wed
5/29		Thu
5/30		Fri
5/31		Stops
UA450608:25 am11:35 amCheck FareCheck FareCheck FareCheck FareCheck FareCheck FareCheck Fare
0 Stops
UA445400:50 pm03:59 pmCheck FareCheck FareCheck FareCheck FareCheck FareCheck FareCheck Fare
0 Stops

Best Washington Dulles Intl. Flight and Hotel Packages

Washington Dulles Intl. flight + hotel packages - economy flights

Price found within the past 48 hours. Click for updated prices.
Hamilton Hotel Washington DC

Hamilton Hotel Washington DC

4 out of 5
per person
Jul 7 - Jul 10
found 23 hours ago
Roundtrip non-stop flight included
St. Louis (STL) to Washington (DCA)
AC Hotel by Marriott Washington DC Downtown

AC Hotel by Marriott Washington DC Downtown

4 out of 5
per person
Jul 7 - Jul 10
found 23 hours ago
Roundtrip non-stop flight included
St. Louis (STL) to Washington (DCA)
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Frequently asked questions

Are there direct flights from Lambert Field to Washington Dulles Intl. Airport (IAD)?
The only thing standing between you and your next amazing adventure is a single flight. United Airlines is the only airline that operates nonstop services between Lambert-St. Louis Intl. Airport (STL) and IAD, so it’s wise to book ahead.
How long is the flight from St. Louis Lambert International Airport to Dulles Intl. Airport?
If you were hoping to squeeze in a decent snooze during your St. Louis to Sterling flight, you may have to make other plans. The usual flight time between Lambert-St. Louis Intl. Airport (STL) and Dulles Intl. Airport is a short 1 hour and 59 minutes — just enough to relax your body and close your eyes for a little while.
What is the flight distance from Lambert Field to IAD?
With a flight distance of only 700 mi, a magazine or a podcast is all you’ll need to keep yourself amused on the journey between St. Louis Lambert International Airport and IAD. You’ll be filing off the aircraft and diving into exciting adventures in no time.
What airlines fly from STL to Dulles Intl. Airport?
If you’re on the lookout for an airline that flies direct from St. Louis to Sterling and rates highly with travelers, try United Airlines. They offer up to 95 flights each month.
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 2021. Tuesday and Wednesday prices are also good, but you may want to prepare your budget if booking during the weekend, as data shows that 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 2021, 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 2021 flight demand trends, last minute planners can still bag a bargain with some of the cheapest fares appearing 0-2 weeks prior to their travel dates.*According to flight demand on Travelocity.com from January to December 2021. Savings are subject to change based on departure location, date and destination.

 

Traveling From
Lambert-St. Louis Intl.
Traveling To
Washington Dulles Intl.
Shortest Flight Time
2 hours 9 mins
Earliest Departure Time
8:25AM CDT
Latest Departure Time
12:50PM CDT
Lowest Flight Price
$169

Route Info

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


Origin:
STL - Lambert-St. Louis International Airport
Destination:
IAD - 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

Discover our best flights from St. Louis STL to Washington IAD. 

With 20 airlines to choose from on Travelocity, you can easily find the best option for you. Use our filters to sort by price, compare airlines, and find the most convenient flight times. 

 

Find our best return flights from St. Louis STL to Washington IAD at the right price  

Airfares to Washington IAD from St. Louis STL currently cost between $169 and $207. It’s usually cheaper to book a round trip than two separate one-way flights. Prices and availability subject to change. Additional terms may apply. 

 

Book one-way flights from St. Louis STL to Washington IAD 

If you want to be flexible about when you return, or keep your travel options open ended, a one-way flight could be just the ticket! You’ll find one-way airfares from St. Louis STL to Washington IAD on Travelocity starting at $85. Prices and availability subject to change. Additional terms may apply. 

 

Get to Washington IAD from St. Louis STL quicker with direct flights. 

Get to Washington faster, without the hassle of changing planes and moving baggage, by booking a direct flight. Expect your direct flight to IAD from STL to take around 2 hour(s) 9 min(s).  

 

Find our cheapest airfares for flights from St. Louis STL to Washington IAD

Find cheap flight deals by using our search filters to sort results starting with the lowest price airfares to IAD from STL. Our Price Match Promise means if you find a lower rate on Travelocity.com or on another US-based website within 24 hours of booking, we’ll credit or refund the difference.  

 

Get our best airfare deals for your flight from St. Louis STL to Washington IAD today 

If you’re flexible about when you travel, August is usually the cheapest month to fly from St. Louis STL to Washington IAD. If you need to be more specific, search by date and arrival and departure times.Then, compare prices across different airlines, and sort results by lowest price first. 

 

Book flexible airline tickets for flights to Washington IAD from St. Louis STL 

Some airlines let you change your travel dates without charging a fee. Use our ‘no change fee’ filter to see which flights to IAD from STL have this option.  

 

Travel with confidence when you book flights to Washington IAD from St. Louis STL with Travelocity 

We’ve secured fantastic deals with all the main airline carriers and it’s easy to compare, choose, and book with Travelocity. With 24/7 customer service and our free 'App', we’ll always keep you moving. 

*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.