$125 Cheap United flights St. Louis (STL) to Washington (IAD)

View $125 flight on Mon, Jul 7, 2025Opens in a new window

$125 Cheap United flights St. Louis (STL) to Washington (IAD)

Prices were available within the past 7 days and start at $125 for one-way flights and $279 for roundtrip, for the period specified. Prices and availability are subject to change. Additional terms apply.
United
Mon, Aug 4 - Tue, Aug 12
STL
St. Louis
IAD
Washington
$279
Roundtrip
Found 3 days ago
Select United flight, departing Mon, Aug 4 from St. Louis to Washington, returning Tue, Aug 12, priced at $279 Found 3 days ago
United
Mon, Aug 4 - Tue, Aug 12
STL
St. Louis
IAD
Washington
$309
Roundtrip
Found 3 days ago
Select United flight, departing Mon, Aug 4 from St. Louis to Washington, returning Tue, Aug 12, priced at $309 Found 3 days ago
United
Mon, Aug 4 - Tue, Aug 12
STL
St. Louis
IAD
Washington
$328
Roundtrip
Found 3 days ago
Select United flight, departing Mon, Aug 4 from St. Louis to Washington, returning Tue, Aug 12, priced at $328 Found 3 days ago
United
Mon, Aug 4 - Tue, Aug 12
STL
St. Louis
IAD
Washington
$333
Roundtrip
Found 3 days ago
Select United flight, departing Mon, Aug 4 from St. Louis to Washington, returning Tue, Aug 12, priced at $333 Found 3 days ago
United
Mon, Aug 4 - Tue, Aug 12
STL
St. Louis
IAD
Washington
$336
Roundtrip
Found 3 days ago
Select United flight, departing Mon, Aug 4 from St. Louis to Washington, returning Tue, Aug 12, priced at $336 Found 3 days ago
United
Mon, Aug 4 - Tue, Aug 12
STL
St. Louis
IAD
Washington
$349
Roundtrip
Found 3 days ago
Select United flight, departing Mon, Aug 4 from St. Louis to Washington, returning Tue, Aug 12, priced at $349 Found 3 days ago
Flights from St. Louis (STL) to Washington (IAD)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Washington Dulles Intl.
Distance
1111 km
Average flight time
3 hours 8 mins