St Louis to Washington

STLIAD

Fly from St Louis to Washington starting at USD 147 with Frontier Airlines.Best fare available on Sep 18, 2026.Limited seats. Better plans. Book before it's gone.

St Louis to Washington cheapest flights this week

10 Sept
Frontier Airlines
18:39STL
09:17IAD
1 StopUSD 175VIEW DEAL
10 Sept
United Airlines
12:28STL
20:28IAD
1 StopUSD 280VIEW DEAL
12 Sept
Frontier Airlines
12:17STL
05:20IAD
1 StopUSD 176VIEW DEAL
15 Sept
Frontier Airlines
12:17STL
05:20IAD
1 StopUSD 259VIEW DEAL
18 Sept
Frontier Airlines
14:29STL
23:10IAD
1 StopUSD 147VIEW DEAL
20 Sept
Frontier Airlines
17:19STL
08:32IAD
1 StopUSD 151VIEW DEAL

St Louis to Washington monthly flight fare trend

Sep
from USD 147
Oct
No flights
Nov
No flights
Dec
No flights
Jan
No flights
Feb
No flights

Airport Details

Origin

St Louis

St. Louis Lambert International Airport (STL)

St Louis, STL
Zone

Chicago

Elev

618 ft

Destination

Washington

Washington Dulles International Airport (IAD)

Dulles, IAD
Zone

New York

Elev

312 ft

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