$406 Cheap American Airlines flights St. Louis (STL) to Washington (IAD)

View $406 flight on Sat, Dec 27, 2025Opens in a new window

$406 Cheap American Airlines flights St. Louis (STL) to Washington (IAD)

Prices were available within the past 7 days and start at $406 for one-way flights and $682 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sat, Dec 27 - Tue, Dec 30
STL
St. Louis
IAD
Washington
$682 Roundtrip, found 1 day ago
$682
Roundtrip
found 1 day ago
Select American Airlines flight, departing Sat, Dec 27 from St. Louis to Washington, returning Tue, Dec 30, priced at $682 found 1 day ago

Find the cheapest month to fly from St. Louis (STL) to Washington (IAD)

December is typically the cheapest month to fly

From $134 - $704 per traveler.

Alternative airports near Washington

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Ronald Reagan Washington National DCA. Closest option available. Average driving time to city center is 8 minutes. Flights from $348
DCA
Ronald Reagan Washington National
Closest
Average driving time to city center8 min
Flights from $348
Flights from St. Louis (STL) to Washington (IAD)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Washington Dulles Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines, United
Popular airline
United
Distance
1111 km
Average flight time
3 hours 10 mins