$109 Cheap United flights from St. Louis to Washington (STL to IAD)

Find The Best Day To Fly from St. Louis to Washington

Amazing United STL to IAD Flight Deals

The cheapest flights to Washington Dulles Intl. found within the past 7 days were round trip and $109 one way. Prices and availability subject to change. Additional terms may apply.

Frequently asked questions

Can I catch a flight from St. Louis Lambert International Airport to Washington Dulles Intl. Airport (IAD) right now?
Make sure you visit our Covid-19 Travel Advisor to find out if there are any current travel advice reports and quarantine requirements in effect in IAD when flying from St. Louis Lambert International Airport.
What terminal is United Airlines at St. Louis Lambert International Airport?
Flights normally leave from terminal 1 at St. Louis Lambert International Airport if you’ve booked a ticket with United Airlines. Landing at Washington Dulles Intl. Airport (IAD)? Contact your airline (or do some online research) to find out exactly which terminal you’ll be pulling into.
Are there United Airlines non-stop flights from STL to IAD?
Yes. Book a nonstop flight with United Airlines from St. Louis Lambert International Airport to Washington Dulles Intl. Airport (IAD), and you won’t have to worry about stopovers or trying to run for your connecting flight.
How long is a United Airlines flight from STL to IAD?
Bad weather, tailwinds, headwinds … They’re just a few factors that can influence how long your time in the air will last. However, a flight from St. Louis Lambert International Airport to Dulles Intl. Airport with United Airlines takes roughly 2 hours and 45 minutes, so you’ll have landed and be in getaway mode in next to no time.
What type of aircraft does United Airlines fly from STL to IAD?
Booked a flight with United Airlines between STL and IAD? The Embraer ERJ and the Canadair (Bombardier) Regional Jet 550 are the two types of aircraft that normally operate on this route.
How many direct and indirect flights does United Airlines fly from STL to IAD?
You can take your pick of about 3 flights every day with United Airlines from St. Louis Lambert International Airport to Washington Dulles Intl. Airport (IAD).
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 IAD, please visit our Customer Service Portal.
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.
CarrierFlightDepart STLArrive IADFri
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4/25		Stops
UA450608:27 am11:37 amCheck FareCheck FareCheck FareCheck FareCheck FareCheck FareCheck Fare
0 Stops
UA445401:00 pm04:10 pmCheck FareCheck FareCheck FareCheck FareCheck FareCheck FareCheck Fare
0 Stops

Discover our best United flight from St. Louis STL to Washington IAD 

To find the best deals on flights to St. Louis from Washington with United, just enter your travel dates, filter by United, and hit search. You’ll find 2 flights to choose from and can sort by price, flight duration, and arrival or departure time.  

 

Return flights from St. Louis STL to Washington IAD with United 

If you’re planning a round trip, booking return flights with United is usually the most cost-effective option. With airfares ranging from to , it’s easy to find a flight that suits your budget. Prices and availability subject to change. Additional terms may apply. 

 

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

A one-way ticket gives you much greater flexibility—allowing you to choose your return date, destination, and time whenever you’re ready. By booking in advance you can find great deals on one-way tickets too. Right now, a one-way United flight from St. Louis to Washington costs from $109. Prices and availability subject to change. Additional terms may apply. 

 

The easy way to find cheap flights to Washington IAD from  St. Louis STL with United 

To find a cheap United flight from St. Louis STL to Washington IAD, sort your search results by price or filter by budget. Thanks to Travelocity’s Price Match Promise, if you find a better airfare deal anywhere else within 24 hours, we’ll credit or refund the difference. 

 

How to find our best airfare deals on United flights from St. Louis STL to Washington IAD 

If you’re looking for cheap flights, it helps to be flexible when it comes to your travel dates. You’ll usually find lower cost tickets when you travel during quieter months such as , or if you book a flight with a stopover. 

 

Find nonstop flights from St. Louis STL to Washington IAD with United 

If you’re keen to be on Washington soil fast, don’t waste time with a stopover—filter your search results to show direct United flights only. The journey takes around 2 hour(s) 10 min(s) – so you’ll be there before you know it. 

 

Flexible airline tickets for United flights from St. Louis STL to Washington IAD 

Make sure you’re not out of pocket if plans change by choosing a flexible ticket with penalty-free amendment and cancellation options. Use our ‘no change fee’ filter to see which flights have this option.  

 

There are a lot of reasons to book your flights to Washington IAD from  St. Louis STL with United on Travelocity 

At Travelocity our vast and up-to-the-minute inventory puts all of our best flight deals in one place. So, whether you’re traveling on business or jetting off with friends and family, you can trust Travelocity to get you there.

United Airports
Hop on a(n) United flight today by flying to many destinations out of these domestic and international airports:
Airport code
Country
Airport name
Number of flights
ORDUSAO'Hare Intl.227
DENUSADenver Intl.226
IAHUSAGeorge Bush Intercontinental136
IADUSAWashington Dulles Intl.100
SFOUSASan Francisco Intl.64
LAXUSALos Angeles Intl.23
EWRUSALiberty Intl.20
FRADEUFrankfurt Intl.19
NRTJPNNarita Intl.19
PEKCHNCapital Intl.16

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