Most accurate provider | FlightHub 3 stars |
---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $229 (United Airlines) |
One-way from | $115 (United Airlines) |
Popular in | July |
Cheapest in | November |
Average price | $356 |
Fly from
Fly to
Route
Depart
Return
Price
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Fri 2/7
12:55 pm-4:03 pm
Nonstop2h 08m
Washington, D.C. Dulles Intl
Wed 2/12
5:35 pm-7:09 pm
Nonstop2h 34m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Wed 1/29
6:00 am-12:46 pm
1 stop5h 46m
Washington, D.C. Dulles Intl
Sat 2/1
12:31 pm-4:37 pm
1 stop5h 06m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Sat 1/11
5:05 pm-4:56 pm
1 stop22h 51m
Washington, D.C. Dulles Intl
Mon 1/13
6:03 pm-11:27 pm
1 stop6h 24m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Mon 1/6
5:58 pm-12:02 am
1 stop5h 04m
Washington, D.C. Dulles Intl
Tue 1/7
1:52 pm-7:23 pm
1 stop6h 31m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Wed 1/22
12:55 pm-4:03 pm
Nonstop2h 08m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Tue 1/7
6:30 am-11:51 am
1 stop4h 21m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Tue 2/4
5:40 am-7:35 pm
2 stops12h 55m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Sun 3/9
5:24 pm-5:13 pm
1 stop22h 49m
St. LouisWashington, D.C.
STL - IAD
STLIAD
Lambert-St Louis
Tue 2/11
3:48 pm-4:15 pm
3 stops23h 27m
Provider | Price Accuracy | Trust Score* |
---|---|---|
Expedia | Price Accuracy1 star | Trust Score*3 stars |
FlightHub | Price Accuracy3 stars | Trust Score*3 stars |
eDreams | Price Accuracy3 stars | Trust Score*3 stars |
Priceline | Price Accuracy2 stars | Trust Score*3 stars |
The best time to book flights from St. Louis to Washington, D.C. Dulles Intl Airport is 75 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.
Currently, August is the cheapest month in which you can book a flight from St. Louis to Washington, D.C. Dulles Intl Airport (average of $309). Flying from St. Louis to Washington, D.C. Dulles Intl Airport in June is currently the most expensive (average of $389). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
It’s optimal to fly from St. Louis to Washington, D.C. Dulles Intl Airport in the evening. By choosing this option you can save up to 47% on the cost of your flight, compared to a flight at noon.
The most flights from STL to IAD are scheduled on a Monday (6 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (3 on average).
In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.
If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).
Comfort
Entertainment
Crew
Boarding
Overall
Food
Reviews
Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Comfort
Entertainment
Crew
Boarding
Overall
Food
Reviews
Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Comfort
Entertainment
Crew
Boarding
Overall
Food
Reviews
Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Comfort
Entertainment
Crew
Boarding
Overall
Food
Reviews
Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Airline | Cheapest | Average | Flexibility | On-time |
---|---|---|---|---|
American Airlines | Cheapest$129 | Average$296 | FlexibilityNo cancel fee | On-time71% |
Delta | Cheapest$177 | Average$270 | FlexibilityNo cancel fee | On-timeN/A |
United Airlines | Cheapest$211 | Average$458 | FlexibilityNo cancel fee | On-time69% |