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United States
Washington Dulles International Airport
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United States
Lambert-Saint Louis International Airport
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Scan through all non-stop flights from Washington to St. Louis. The full flight schedule below gives an overview of all non-stop flights from IAD to STL, which includes the daily timetable of every operating airline for the upcoming 12 months.
Note: for airline-specific flight schedules, please scroll further down.
St. Louis is a humid subtropical or warm-temperate destination, featuring hot, humid summers with temperatures typically around 30°C (86°F) and mild to cool winters. The region is known for consistent rainfall throughout the year, peaking in summer. The area is known for its vibrant urban energy, diverse landscapes, and numerous outdoor activities.
You can visit St. Louis any time of the year, but the best months to explore are from to and from to .
Currently, there is only one airline operating non-stop flights from Washington IAD to St. Louis STL, which is United Airlines. This section gives an overview of the flight schedules and timetables of every airline with direct flights for this route.
Click an airline below to view their IAD STL flight schedule.
Flights from IAD to STL are operated once a week. Departure times vary between 08:20 - 17:55. The earliest flight departs at 08:20, the last flight departs at 17:55. However, this depends on the date you are flying so please check with the full flight schedule above to see which departure times are available on your preferred date(s) of travel.
You can fly in Economy and Business Class. Premium Economy and First Class are not available on this route (at least not as a non-stop flight).
The fastest direct flight from Washington to St. Louis takes 2 hours and 31 minutes. The flight distance between Washington and St. Louis is 694 miles (or 1,117 km).
There is 1 airport in St. Louis: Lambert-Saint Louis International Airport (STL).
There is 1 flight per week flying from Washington to St. Louis (as of March 2026).
2 hours and 31 minutes is the average flight time from Washington to St. Louis.
The distance from Washington to St. Louis is 694 miles (1,117 kilometers).
United Airlines is the only airline flying nonstop from Washington to St. Louis.
Star Alliance is currently the only alliance flying nonstop from Washington to St. Louis.
You can fly non-stop in Economy and Business Class.
Aircraft types that fly from Washington to St. Louis:
The earliest flight departs at 08:20 from Washington and arrives at 09:48 at St. Louis.
The latest flight departs at 17:55 from Washington and arrives at 19:26 at St. Louis.
694 miles (1,117 km) · 2h 31m
09:00
10:28
United Airlines
Star Alliance
UA 4427
United Airlines
Bombardier CRJ 550
Y
W
J
F
17:45
19:22
United Airlines
Star Alliance
UA 4527
United Airlines
Bombardier CRJ 550
Y
W
J
F
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