Cheap flights from St. Louis to Dulles Intl (STL - IAD)

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Home North America USA Washington Dulles Intl Cheap flights from St. Louis to Dulles Intl

How to find the cheapest flight from
St. Louis (STL) to Dulles Intl (IAD)

All the information you need to plan the best STL to IAD flight in 2021: compare St. Louis to Dulles Intl flight prices with the expected peak season, weather and rainfall in Dulles Intl.
STL - IAD
Price
$175 - $350
IAD
Temperature
35.6 - 80.6 °F
IAD
Precipitation
2.6 - 4 inches

Popular in

February

High demand for flights, 14% potential price rise

Cheapest in

August

Best time to find cheap flights, 42% potential price drop

Round-trip from

$175

From Lambert-St Louis to Washington Dulles Intl

One-way from

$126

One-way flight from Lambert-St Louis to Washington Dulles Intl

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest month to fly from St. Louis to Washington Dulles Intl Airport?

Due to multiple factors, expect to potentially pay more when booking in March. For low rates, August can be a great choice for travel to Washington Dulles Intl Airport. Flights to Washington Dulles Intl Airport from St. Louis in August are about $290 on average during August, but can be found for as low as $148.

How far in advance should I book a flight from St. Louis to Washington Dulles Intl Airport?

To save on the cost of your flight from St. Louis to Washington Dulles Intl Airport, book at least 28 days before your planned departure. Booking around this time can save you about 45% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $355 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $447.

When is the cheapest time to fly from St. Louis to Washington Dulles Intl Airport (STL - IAD)?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to Washington Dulles Intl Airport as you normally would.

Cheap flights from St. Louis to Dulles Intl in October, November 2021

The best prices found for STL to IAD flights for October, November
8 Nov - 11 Nov
$157pp
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
18 Nov - 21 Nov
$162pp
STL
Lambert-St Louis
Major Airline
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
Major Airline
 
1 STOP
STL
Lambert-St Louis
4 Nov - 11 Nov
$165pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis

Lambert-St Louis to Dulles Intl 2021 flight deals

Cheap flights to Dulles Intl from St. Louis found for this year
4 Dec - 7 Dec
$157pp
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
18 Nov - 21 Nov
$162pp
STL
Lambert-St Louis
Major Airline
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
Major Airline
 
1 STOP
STL
Lambert-St Louis
4 Nov - 11 Nov
$165pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis

Non-stop flights to Dulles Intl from St. Louis

Save time with St. Louis to Dulles Intl direct flight deals
4 Dec - 7 Dec
$157pp
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
3 Nov - 7 Nov
$167pp
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
5 Nov - 7 Nov
$177pp
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis

Last minute flights from St. Louis to Dulles Intl

Late deals on round-trip flights to Dulles Intl from St. Louis, departing today and this week
29 Oct - 2 Nov
$246pp
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
29 Oct - 2 Nov
$255pp
STL
Lambert-St Louis
United Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
25 Oct - 1 Nov
$257pp
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis

One-way flights to Dulles Intl from St. Louis

The cheapest one-way flights from St. Louis to Dulles Intl
12:22 am - 5:33 am
American Airlines
1 Stop
4h 11m
STL - IAD
American Airlines
$126
8:08 am - 1:36 pm
Delta
1 Stop
4h 28m
STL - IAD
Delta
$145
Delta
12:08 pm - 6:48 am
United Airlines
2 Stops
17h 40m
STL - IAD
United Airlines
$150
United

Related info for your journey

Useful info, stats and facts about <span class="emphasized">St. Louis</span> to <span class="emphasized">Dulles Intl</span> flights.

Flight FAQs

From St. Louis to Dulles Intl

What airport do you fly from for flights from St. Louis to Washington Dulles Intl?

Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Washington Dulles Intl. On average, Lambert-St Louis has 7 outbound flights to Washington Dulles Intl per day from 5 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

Which airlines flying from Lambert-St Louis to Washington Dulles Intl have flexible cancellations due to COVID-19?

Some of the carriers operating flights from Lambert-St Louis to Washington Dulles Intl that may be offering flexible cancellation policies are United Airlines, American Airlines, and Frontier. Our site will let you filter for all airlines offering greater flexibility due to COVID-19.

Can I find flights from St. Louis to Washington Dulles Intl Airport for under $200 on Cheapflights?

Yes, there are multiple flights from St. Louis to Washington Dulles Intl Airport for under $200. The cheapest flight booked recently is on United Airlines for just $157, but on average you can expect to pay $179.

Are there nonstop flights from St. Louis to Washington Dulles Intl Airport for under $200 on Cheapflights?

Cheapflights has at least 20 direct flights from St. Louis to Washington Dulles Intl Airport under $200. A good price for a nonstop flight from St. Louis to Washington Dulles Intl Airport is less than $248.

Are there last-minute flights available from St. Louis to Washington Dulles Intl Airport for under $300?

There are currently 20+ open flights from St. Louis to Washington Dulles Intl Airport within the next 7 days for less than $300.

What days are nonstop flights available from St. Louis to Washington Dulles Intl Airport?

Days when nonstop flights are available for this flight are: Tuesday, Thursday, Friday.

How many flights depart from St. Louis to Washington Dulles Intl Airport on average per day?

3 flight departures from St. Louis to Washington Dulles Intl Airport per day on average.
Afternoon (Noon - 6pm) - 100% of flight departures

How long is the flight from St. Louis to Washington Dulles Intl Airport?

For as low as $157, United Airlines can have you in Washington Dulles Intl Airport from St. Louis in 2h 06m. St. Louis and Washington Dulles Intl Airport are separated by a distance of 698 mi. Both multi-stop and nonstop flights can be found to your destination and back.

What are the cheapest airlines flying from St. Louis to Washington Dulles Intl Airport round-trip?

According to our current data, United Airlines ($157), Major Airline ($162), and American Airlines ($172) offers the cheapest pricing from St. Louis to Washington Dulles Intl Airport. Users have found that United Airlines is 47% cheaper than the other options available to this destination.

What are the cheapest airlines to fly from St. Louis to Washington Dulles Intl Airport one-way?

The cheapest airlines for a one-way flight from St. Louis to Washington Dulles Intl Airport are United Airlines ($79), American Airlines ($86), and Frontier ($134).

What are the most popular airlines that fly from St. Louis to Washington Dulles Intl Airport?

Major Airline, American Airlines and Delta are the most popular airlines when flying from St. Louis to Washington Dulles Intl Airport.

What are the cheapest flights from St. Louis to Washington Dulles Intl Airport?

On average you can expect to pay $292 for a flight from St. Louis to Washington Dulles Intl Airport. The cheapest flight overall is $111 while the most popular route, (Lambert-St Louis - Washington Dulles Intl) is currently priced at $173.

What are the most reliable airlines from St. Louis to Washington Dulles Intl Airport?

No one likes to see their flight delayed. When booking a flight from St. Louis to Washington Dulles Intl Airport consider choosing Copa Airlines (83%), Brussels Airlines (82%) or United Airlines (81%) as they are the most reliable in getting you off to your destination on time.

Related searches

Flights to Dulles Intl from St. Louis (STL)
Flights to St. Louis Flights to Dulles Intl Flights from Dulles Intl

Rent a Car

Car Rentals at Dulles Intl

COVID Restrictions

View COVID Travel Restrictions for Dulles Intl (IAD)

Do I need a COVID test to fly to Dulles Intl from St. Louis?

Information is based on travel restrictions for travel to Washington Dulles Intl within the United States

Most visitors from Lambert-St Louis need to provide a negative COVID-19 test result and/or quarantine to enter Washington Dulles Intl.

COVID-19 testing requirements
Visitors from Lambert-St Louis must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Washington Dulles Intl.

Quarantine requirements
Visitors from Lambert-St Louis are not required to quarantine after entering Washington Dulles Intl.

Do I need a test to fly back to St. Louis from Dulles Intl?

Returning to Lambert-St Louis from Washington Dulles Intl

COVID-19 testing requirements
Visitors from Washington Dulles Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Lambert-St Louis.

Quarantine requirements
Visitors from Washington Dulles Intl are not required to quarantine after entering Lambert-St Louis.

Hide COVID Travel Restrictions for Dulles Intl (IAD)

Alternative routes for St. Louis to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.
Lambert-St Louis to Washington from $149 pp
Kansas City to Washington from $172 pp
Springfield Springfield-Branson to Washington from $301 pp

Destination information for Dulles Intl

Things to know before you go - useful duration and weather info for your trip from St. Louis to Dulles Intl.
Flight duration from STL to Washington Dulles Intl
2h 17m
Average temperature for October in Dulles Intl
69.8 °F
Avg rainfall for October in Dulles Intl
3.8 ″

Airports servicing St. Louis

St. Louis (STL)

Airports servicing Washington

Dulles Intl (IAD)

Top 4 airlines flying from Lambert-St Louis to Washington Dulles Intl

The chart below displays the airlines Cheapflights users traveling from St. Louis to Dulles Intl choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
Frontier 		$112 $230 No cancel fee 62%
American Airlines 		$123 $283 No cancel fee 71%
Delta 		$134 $286 No cancel fee N/A
United Airlines 		$211 $377 No cancel fee 69%

Popular flight searches

Check out other popular destinations found by fellow travelers in 2021.

Hourly flight availability from St. Louis to Dulles Intl

See what time of day planes typically take off from St. Louis towards Dulles Intl.
Afternoon Noon to 6 PM 67% of STL to IAD departures
Morning 6 AM to noon 32% of STL to IAD departures
Early morning Midnight to 6 AM 1% of STL to IAD departures
Evening 6 PM to midnight 0% of STL to IAD departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from St. Louis to Dulles Intl
See how many times per day planes take to the skies headed from St. Louis to Dulles Intl.
Sunday
6 daily flights
Monday
7 daily flights
Tuesday
8 daily flights
Wednesday
9 daily flights
Thursday
8 daily flights
Friday
6 daily flights
Saturday
6 daily flights
Home North America USA Washington Dulles Intl Cheap flights from St. Louis to Dulles Intl