$100 Cheap flights from Washington Dulles Intl. to Lambert-St. Louis Intl. (IAD to STL)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

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

Compare Flight Prices from Washington to St. Louis

Affordable Airfare Tickets from IAD to STL Airport

The cheapest flights to Lambert-St. Louis Intl. found within the past 7 days were $191 round trip and $100 one way. Prices and availability subject to change. Additional terms may apply.

Sat, Apr 26 - Wed, Apr 30
IAD
Washington
STL
St. Louis
$191 Roundtrip, found 4 days ago
$191
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Sat, Apr 26 from Washington to St. Louis, returning Wed, Apr 30, priced at $191 found 4 days ago
Wed, May 28 - Fri, May 30
IAD
Washington
STL
St. Louis
$192 Roundtrip, found 5 days ago
$192
Roundtrip
found 5 days ago
Select United flight, departing Wed, May 28 from Washington to St. Louis, returning Fri, May 30, priced at $192 found 5 days ago
Sun, May 4 - Wed, May 7
IAD
Washington
STL
St. Louis
$198 Roundtrip, found 6 days ago
$198
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Sun, May 4 from Washington to St. Louis, returning Wed, May 7, priced at $198 found 6 days ago
Sat, May 24 - Wed, May 28
IAD
Washington
STL
St. Louis
$199 Roundtrip, found 11 hours ago
$199
Roundtrip
found 11 hours ago
Select Delta flight, departing Sat, May 24 from Washington to St. Louis, returning Wed, May 28, priced at $199 found 11 hours ago
Sun, May 18 - Wed, May 28
IAD
Washington
STL
St. Louis
$201 Roundtrip, found 3 days ago
$201
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Sun, May 18 from Washington to St. Louis, returning Wed, May 28, priced at $201 found 3 days ago
Sun, May 25 - Wed, May 28
IAD
Washington
STL
St. Louis
$202 Roundtrip, found 11 hours ago
$202
Roundtrip
found 11 hours ago
Select Delta flight, departing Sun, May 25 from Washington to St. Louis, returning Wed, May 28, priced at $202 found 11 hours ago
Sun, May 4 - Thu, May 8
IAD
Washington
STL
St. Louis
$208 Roundtrip, found 6 days ago
$208
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Sun, May 4 from Washington to St. Louis, returning Thu, May 8, priced at $208 found 6 days ago
Thu, May 15 - Sun, May 18
IAD
Washington
STL
St. Louis
$212 Roundtrip, found 21 hours ago
$212
Roundtrip
found 21 hours ago
Select Frontier Airlines flight, departing Thu, May 15 from Washington to St. Louis, returning Sun, May 18, priced at $212 found 21 hours ago
Mon, May 19 - Wed, May 28
IAD
Washington
STL
St. Louis
$214 Roundtrip, found 11 hours ago
$214
Roundtrip
found 11 hours ago
Select Frontier Airlines flight, departing Mon, May 19 from Washington to St. Louis, returning Wed, May 28, priced at $214 found 11 hours ago
Wed, May 28 - Fri, May 30
IAD
Washington
STL
St. Louis
$220 Roundtrip, found 5 days ago
$220
Roundtrip
found 5 days ago
Select Delta flight, departing Wed, May 28 from Washington to St. Louis, returning Fri, May 30, priced at $220 found 5 days ago

Lambert-St. Louis Intl. flight + hotel packages - economy flights

Price found within the past 48 hours. Click for updated prices.
White House at Grand Central

White House at Grand Central

4 out of 5
per person
Jun 15 - Jun 21
found 1 day ago
Roundtrip non-stop flight included
Washington (IAD) to St. Louis (STL)
The Wildwood Hotel

The Wildwood Hotel

3.5 out of 5
Save 100% on your flight
per person
Jun 15 - Jun 21
found 1 day ago
Roundtrip non-stop flight included
Washington (IAD) to St. Louis (STL)

Ballpark Heights Apartments By Barsala

4 out of 5
Save 100% on your flight
per person
Jun 15 - Jun 21
found 1 day ago
Roundtrip non-stop flight included
Washington (IAD) to St. Louis (STL)
Ameristar Casino Resort and Spa

Ameristar Casino Resort and Spa

4.5 out of 5
Save 100% on your flight
per person
Jun 15 - Jun 21
found 1 day ago
Roundtrip non-stop flight included
Washington (IAD) to St. Louis (STL)
The Cheshire

The Cheshire

4 out of 5
per person
Jun 15 - Jun 21
found 1 day ago
Roundtrip non-stop flight included
Washington (IAD) to St. Louis (STL)
Don't see what you're looking for?
See all available trips from Washington Dulles Intl. to Lambert-St. Louis Intl.
View all trips

Frequently asked questions

Can I catch a flight from Dulles Intl. Airport to St. Louis Lambert International Airport right now?
Make sure you check out our Covid-19 Travel Advisor to see if there are any current quarantine requirements and travel advice reports in effect in Lambert-St. Louis Intl. Airport (STL) when jet-setting from IAD.
Are there direct flights from IAD to Lambert-St. Louis Intl. Airport (STL)?
For a no-fuss trip between Sterling and St. Louis, take a look at United Airlines. They offer direct flights from Dulles Intl. Airport to STL.
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 Lambert-St. Louis Intl. Airport (STL), please visit our Customer Service Portal.
How long is the flight from Washington Dulles Intl. Airport (IAD) to STL?
Begin your travels feeling rested and relaxed by having a snooze and a snack during your flight to STL. With a general travel time of 5 hours and 8 minutes from Dulles Intl. Airport, you’ll have ample time to enjoy both.
What is the flight distance from Dulles Intl. Airport to STL?
Don’t worry about settling in for a movie. You’ll be lucky to even manage a couple of episodes of your favorite show on the short journey between Dulles Intl. Airport and St. Louis Lambert International Airport. You’ll only be traveling 700 mi.
What airlines fly from IAD to STL?
Ready to book the ticket for your next incredible adventure? Eager to travel from IAD to Lambert Field as fast as possible? Step aboard one of the 91 nonstop flights offered by United Airlines each month, and you’ll be landing before you can ask ‘Are we there yet?’
What airlines have practices regarding COVID-19 in place and use social distancing?
From the moment you enter the departure terminal to when you leave the arrivals terminal, if you’re flying with Southwest Airlines, American Airlines or Delta you can be sure that COVID-19 measures and social distancing rules have been adhered to. Many airlines have introduced capped capacity flights and keeping the middle seat empty.
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.

Flight information from Washington to St. Louis

 

Traveling From
Washington Dulles Intl.
Traveling To
Lambert-St. Louis Intl.
Shortest Flight Time
0 hours 23 mins
Earliest Departure Time
8:35AM CDT
Latest Departure Time
5:55PM CDT
Lowest Flight Price
$191

Route Info

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


Origin:
IAD - Washington Dulles International Airport
Destination:
STL - Lambert-St. Louis International Airport
Distance:
827.00 miles


Airlines & Aircraft Used on IAD to STL Flight Routes


Airline Carrier
Aircraft
American Airlines
Embraer RJ145 Amazon
Jet Airways (India)
Boeing 737-900 pax
United Airlines
Airbus A321-100/200
United Airlines
Boeing 737-500 pax
United Airlines
Boeing 737-600 pax

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

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 Washington IAD to St. Louis STL at the right price  

Airfares to St. Louis STL from Washington IAD currently cost between $191 and $220. 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 Washington IAD to St. Louis STL 

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 Washington IAD to St. Louis STL on Travelocity starting at $100. Prices and availability subject to change. Additional terms may apply. 

 

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

Get to St. Louis faster, without the hassle of changing planes and moving baggage, by booking a direct flight. Expect your direct flight to STL from IAD to take around 0 hour(s) 23 min(s).  

 

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

Find cheap flight deals by using our search filters to sort results starting with the lowest price airfares to STL from IAD. 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 Washington IAD to St. Louis STL today 

If you’re flexible about when you travel, April is usually the cheapest month to fly from Washington IAD to St. Louis STL. 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 St. Louis STL from Washington IAD 

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

 

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