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

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The best prices from St Louis to Washington Dulles Intl are usually found in September or April, booked 33 days in advance, depart on a Tuesday or Thursday and return on a Tuesday

$360
$330
$300
$275
Price
$275 - $344
Temperature
46 - 88 °F
Rainfall
3 - 4 inches
Most popular in July High demand for flights, 3% potential price rise
Cheapest in September Best time to find cheap flights, 1% potential price drop
Average price $299 Price for this month
Cheapest price $275 From St Louis to Washington Dulles Intl

Cheap flights from St Louis to Washington Dulles Intl in February 2020

The best prices found for STL to IAD flights for February
29 Feb - 5 Mar
$316pp
STL
Lambert-St Louis
United Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
28 Feb - 9 Mar
$402pp
STL
Lambert-St Louis
United Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
27 Feb - 2 Mar
$491pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis

St Louis to Washington Dulles Intl 2020 flight deals

Cheap flights to Washington Dulles Intl from St Louis found for this year
15 Apr - 20 Apr
$241pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis
25 Mar - 29 Mar
$255pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis
12 May - 16 May
$275pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
Multiple Airlines
Non-Stop
STL
Lambert-St Louis

Non-stop flights to Washington Dulles Intl from St Louis

Save time with St Louis to Washington Dulles Intl direct flight deals
21 Apr - 28 Apr
$279pp
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 Mar - 9 Mar
$285pp
STL
Lambert-St Louis
United Airlines
Non-Stop
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
Non-Stop
STL
Lambert-St Louis
6 May - 10 May
$296pp
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 Washington Dulles Intl

Late deals on round-trip flights to Washington Dulles Intl from St Louis, departing today and this week
21 Feb - 23 Feb
$379pp
STL
Lambert-St Louis
Major Airline
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
Major Airline
 
1 STOP
STL
Lambert-St Louis
22 Feb - 28 Feb
$485pp
STL
Lambert-St Louis
United Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
United Airlines
   
2 STOPS
STL
Lambert-St Louis
27 Feb - 2 Mar
$491pp
STL
Lambert-St Louis
Multiple Airlines
 
1 STOP
IAD
Washington Dulles Intl
IAD
Washington Dulles Intl
Multiple Airlines
 
1 STOP
STL
Lambert-St Louis

One-way flights to Washington Dulles Intl from St Louis

The cheapest one-way flights from St Louis to Washington Dulles Intl
9:15 am - 12:20 pm
United Airlines
Nonstop
2h 05m
STL - IAD
United Airlines
$140
United
8:25 am - 11:25 am
United Airlines
Nonstop
2h 00m
STL - IAD
United Airlines
$143
United
9:15 am - 12:20 pm
United Airlines
Nonstop
2h 05m
STL - IAD
United Airlines
$157
United

Alternative routes for St Louis to Washington Dulles Intl

Destination information for Washington Dulles Intl

Things to know before you go. Useful info for your trip from St Louis to Washington Dulles Intl
Flight duration
2h 11m
Average temperature for February in Washington Dulles Intl
48.2 °F
Avg rainfall for February in Washington Dulles Intl
2.5 ″

Airports servicing St. Louis

Airports servicing Washington

Weekly flight availability
from St Louis to Washington Dulles Intl
Sunday
6 daily flights
Monday
5 daily flights
Tuesday
5 daily flights
Wednesday
8 daily flights
Thursday
8 daily flights
Friday
5 daily flights
Saturday
4 daily flights

Related info for your journey

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

Flight FAQs

From St Louis to Washington Dulles Intl

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

Nonstop flights are available for this route on the following days: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday.

How popular is this flight route?

The Lambert-St Louis to Washington Dulles Intl flight path was viewed by 22 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

What percent of flights are delayed?

When booking remember that flights St Louis to Washington Dulles Intl are typically on time.

How many passenger seats are available on a flight on this route?

Generally, 200 passengers can be accommodated when flying from Lambert-St Louis to Washington Dulles Intl on commercial airlines.

What is the cheapest airline for this route?

When searching, try setting your filters to view flights for Trans States Airlines, Inc., as currently they have the cheapest options available from St Louis to Washington Dulles Intl. On average you can find 74 flights for this flight path daily.

How long does the flight from St Louis to Washington Dulles Intl take?

A nonstop flight takes up to 2 hours, covering a distance of 434 miles.

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

On average, you can expect to see 10 flights from Lambert-St Louis to Washington Dulles Intl a day.
Morning (6am - Noon) - 20% of flight departures
Afternoon (Noon - 6pm) - 20% of flight departures
Evening (6pm - Midnight) - 60% of flight departures

Does it rain more in St Louis or Washington Dulles Intl?

When traveling, it's generally smart to pack in preparation for rain or any other conditions that may arise. The rainfall in St Louis is roughly similar to Washington Dulles Intl. You can assume this to be the case over the next 13 days.

Is St Louis weather warmer or cooler than Washington Dulles Intl?

Expect the weather to be around 90 °F on average in July. As the temperature peaks, try to get your plans done early, as flight price and availability will have an impact on your travels. The climate in Washington Dulles Intl is generally colder than in St Louis.