Washington to St Louis
IADSTL
Fly from Washington to St Louis starting at USD 118 with Frontier Airlines.
Best fare available on Aug 21, 2026.
Limited seats. Better plans. Book before it's gone.
Washington to St Louis cheapest flights this week
Washington to St Louis monthly flight fare trend
Aug
from USD 118
Sep
No flights
Oct
No flights
Nov
No flights
Dec
No flights
Jan
No flights
Airport Details
Origin
Washington
Washington Dulles International Airport (IAD)
Dulles, IAD
Zone
New York
Elev
312 ft
Destination
St Louis
St. Louis Lambert International Airport (STL)
St Louis, STL
Zone
Chicago
Elev
618 ft
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