Washington to St Louis
IADSTL
Fly from Washington to St Louis starting at USD 62 with F9.
Best fare available on Jun 23, 2026.
Limited seats. Better plans. Book before it's gone.
Washington to St Louis cheapest flights this week
5 May
F9
11:07IAD
--:--STL
1 Stop$97VIEW DEAL
6 May
F9
18:27IAD
--:--STL
1 Stop$69VIEW DEAL
20 May
F9
18:27IAD
--:--STL
1 Stop$69VIEW DEAL
6 Jun
F9
13:26IAD
--:--STL
1 Stop$90VIEW DEAL
19 Jun
F9
07:30IAD
--:--STL
1 Stop$132VIEW DEAL
20 Jun
UA
08:15IAD
--:--STL
1 Stop$147VIEW DEAL
23 Jun
F9
20:57IAD
--:--STL
1 Stop$62VIEW DEAL
24 Jun
F9
20:57IAD
--:--STL
1 Stop$114VIEW DEAL
25 Jun
UA
06:10IAD
--:--STL
1 Stop$167VIEW DEAL
Washington to St Louis monthly flight fare trend
Apr
No flights
May
from USD 69
Jun
from USD 62
Jul
No flights
Aug
No flights
Sep
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
