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

STL — IAD
Aug 15 — Aug 221

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 2022: compare St. Louis to Dulles Intl flight prices with the expected peak season, weather and rainfall in Dulles Intl.

STL - IAD

Price

$187 - $511

IAD

Temperature

35.6 - 80.6 °F

IAD

Rainfall

2.6 - 4 inches

Popular inJuneHigh demand for flights, 37% potential price rise
Cheapest inFebruaryBest time to find cheap flights, 42% potential price drop
Round-trip from$187From Lambert-St Louis to Washington, D.C. Dulles Intl
One-way from$93One-way flight from Lambert-St Louis to Washington, D.C. Dulles Intl

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

To save on the cost of your flight from St. Louis to Washington, D.C. Dulles Intl Airport, book at least 42 days before your planned departure. Booking around this time can save you about 27% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $325 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $392.

What is the cheapest month to fly from St. Louis to Washington, D.C. Dulles Intl Airport?

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, October can be a great choice for travel to Washington, D.C. Dulles Intl Airport. Flights to Washington, D.C. Dulles Intl Airport from St. Louis in October are about $286 on average during October, but can be found for as low as $157.

When is the cheapest time to fly from St. Louis to Washington, D.C. 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, D.C. Dulles Intl Airport as you normally would.

Cheap flights from St. Louis to Dulles Intl in August, September 2022

The best prices found for STL to IAD flights for August, September
Sep 4 - Sep 13
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

Nonstop

2h 10m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

Nonstop

2h 19m
$225

United Airlines

Pick Dates

Deal found 8/8/22

Sep 4 - Sep 8
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

Nonstop

2h 10m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

1 stop

6h 50m
$234

United Airlines

Pick Dates

Deal found 8/8/22

Sep 1 - Sep 4
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

1 stop

4h 16m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

1 stop

6h 59m
$241

Multiple Airlines

Pick Dates

Deal found 8/9/22

St. Louis to Dulles Intl 2022 flight deals

Cheap flights to Dulles Intl from St. Louis found for this year
Sep 4 - Sep 13
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

Nonstop

2h 10m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

Nonstop

2h 19m
$225

United Airlines

Pick Dates

Deal found 8/8/22

Sep 4 - Sep 8
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

Nonstop

2h 10m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

1 stop

6h 50m
$234

United Airlines

Pick Dates

Deal found 8/8/22

Sep 1 - Sep 4
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

1 stop

4h 16m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

1 stop

6h 59m
$241

Multiple Airlines

Pick Dates

Deal found 8/9/22

Cheap United Airlines flights from St. Louis to Dulles Intl

Sep 4 - Sep 13
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

Nonstop

2h 10m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

Nonstop

2h 19m
$225

United Airlines

Pick Dates

Deal found 8/8/22

Sep 4 - Sep 8
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

Nonstop

2h 10m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

1 stop

6h 50m
$234

United Airlines

Pick Dates

Deal found 8/8/22

Aug 31 - Sep 6
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

Nonstop

2h 10m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

Nonstop

2h 19m
$260

United Airlines

Pick Dates

Deal found 8/9/22

Cheap Delta flights from St. Louis to Dulles Intl

Aug 30 - Sep 5
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

1 stop

4h 40m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

1 stop

3h 57m
$278

Delta

Pick Dates

Deal found 8/9/22

Aug 25 - Aug 29
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

1 stop

4h 01m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

1 stop

7h 09m
$310

Delta

Pick Dates

Deal found 8/8/22

Aug 28 - Sep 1
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

1 stop

3h 33m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

1 stop

3h 57m
$311

Delta

Pick Dates

Deal found 8/9/22

Non-stop flights to Dulles Intl from St. Louis

Save time with St. Louis to Dulles Intl direct flight deals
Sep 4 - Sep 13
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

Nonstop

2h 10m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

Nonstop

2h 19m
$225

United Airlines

Pick Dates

Deal found 8/8/22

Aug 31 - Sep 6
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

Nonstop

2h 10m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

Nonstop

2h 19m
$260

United Airlines

Pick Dates

Deal found 8/9/22

Sep 4 - Sep 11
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

Nonstop

2h 10m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

Nonstop

2h 19m
$276

United Airlines

Pick Dates

Deal found 8/7/22

Last minute flights from St. Louis to Dulles Intl

Late deals on return flights to Dulles Intl from St. Louis, departing today and this week
Aug 15 - Sep 7
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

Nonstop

2h 10m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

1 stop

5h 33m
$340

Multiple Airlines

Pick Dates

Deal found 8/8/22

Aug 15 - Sep 7
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

1 stop

4h 19m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

1 stop

5h 33m
$348

American Airlines

Pick Dates

Deal found 8/8/22

Aug 17 - Aug 23
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

1 stop

5h 06m
IAD

Washington, D.C. Dulles Intl

STL

Lambert-St Louis

1 stop

4h 02m
$362

Delta

Pick Dates

Deal found 8/9/22

One-way flights to Dulles Intl from St. Louis

The cheapest one-way flights from St. Louis to Dulles Intl
Sep 3
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

1 stop

6h 50m
$93

Delta

Pick Dates

Deal found 8/10/22

Sep 3
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

Nonstop

2h 10m
$98

United Airlines

Pick Dates

Deal found 8/10/22

Sep 6
STL

Lambert-St Louis

IAD

Washington, D.C. Dulles Intl

2 stops

42h 36m
$113

Multiple Airlines

Pick Dates

Deal found 8/9/22

Related info for your journey

Useful info, stats and facts about St. Louis to Dulles Intl flights.

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

Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Washington, D.C. Dulles Intl. On average, Lambert-St Louis has 3 outbound flights to Washington, D.C. Dulles Intl per day from 4 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, D.C. Dulles Intl have flexible cancellations due to COVID-19?

Due to the rapidly changing circumstances due to COVID-19, airlines like United Airlines, American Airlines, and Delta flying from Lambert-St Louis to Washington, D.C. Dulles Intl have implemented new flexible cancellation policies.

Can I find flights from St. Louis to Washington, D.C. Dulles Intl Airport for under $300 on Cheapflights?

Yes, there are multiple flights from St. Louis to Washington, D.C. Dulles Intl Airport for under $300. The cheapest flight booked recently is on United Airlines for just $225, but on average you can expect to pay $277.

Are there nonstop flights from St. Louis to Washington, D.C. Dulles Intl Airport for under $300 on Cheapflights?

Cheapflights has at least 20 direct flights from St. Louis to Washington, D.C. Dulles Intl Airport under $300. A good price for a nonstop flight from St. Louis to Washington, D.C. Dulles Intl Airport is less than $352.

Are there last-minute flights available from St. Louis to Washington, D.C. Dulles Intl Airport for under $400?

There are currently 20+ open flights from St. Louis to Washington, D.C. Dulles Intl Airport within the next 7 days for less than $400.

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

Currently priced at $225, United Airlines will fly you from St. Louis to Washington, D.C. Dulles Intl Airport and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from American Airlines and Delta - these airlines can fly you to your destination from $253 and $278, respectively. United Airlines is 30% cheaper than the average price of flights available within the next 90 days to this destination.

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

To fly one-way, consider booking your trip with Delta, which is currently one of the cheapest options available, starting at $93. United Airlines flights start at $98 while deals on American Airlines start at $127 one-way.

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

Undisclosed Carrier, American Airlines and Delta are the most popular airlines when flying from St. Louis to Washington, D.C. Dulles Intl Airport.

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

No one likes to see their flight delayed. When booking a flight from St. Louis to Washington, D.C. Dulles Intl Airport consider choosing GoJet (92%), Copa Airlines (91%) or Avianca (84%) as they are the most reliable in getting you off to your destination on time.

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

On average you can expect to pay $300 for a flight from St. Louis to Washington, D.C. Dulles Intl Airport. The cheapest flight overall is $162 while the most popular route, (Lambert-St Louis - Washington, D.C. Dulles Intl) is currently priced at $234.

Alternative routes for St. Louis to Dulles Intl

See prices for flight routes from nearby airports that may be better suited for you.

Top 3 airlines flying from St. Louis to 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.
AirlineCheapestAverageFlexibilityOn-timeCOVID-19 safety
American AirlinesCheapest$141Average$331FlexibilityNo cancel feeOn-time71%COVID-19 safety
Search American Airlines flights
DeltaCheapest$155Average$389FlexibilityNo cancel feeOn-timeN/ACOVID-19 safety
Search Delta flights
United AirlinesCheapest$157Average$315FlexibilityNo cancel feeOn-time69%COVID-19 safety
Search United Airlines flights

Hourly flight availability from St. Louis to Dulles Intl

See what time of day planes typically take off from St. Louis to Dulles Intl
0%of flight departuresEarly morningMidnight to 6 am
100%of flight departuresMorning6 am to noon
0%of flight departuresAfternoonNoon to 6 pm
0%of flight departuresEvening6 pm to midnight
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
Sunday4daily flights
Monday4daily flights
Tuesday2daily flights
Wednesday4daily flights
Thursday2daily flights
Friday4daily flights
Saturday3daily flights