$111 Cheap Frontier Airlines flights St. Louis (STL) to Washington (IAD)

View $111 flight on Thu, Dec 25, 2025Opens in a new window

$111 Cheap Frontier Airlines flights St. Louis (STL) to Washington (IAD)

Prices were available within the past 7 days and start at $111 for one-way flights and $198 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Frontier Airlines
Thu, Dec 25 - Thu, Jan 1
STL
St. Louis
IAD
Washington
$198 Roundtrip, found 2 days ago
$198
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Thu, Dec 25 from St. Louis to Washington, returning Thu, Jan 1, priced at $198 found 2 days ago
Frontier Airlines
Tue, Dec 30 - Thu, Jan 1
STL
St. Louis
IAD
Washington
$224 Roundtrip, found 2 days ago
$224
Roundtrip
found 2 days ago
Select Frontier Airlines flight, departing Tue, Dec 30 from St. Louis to Washington, returning Thu, Jan 1, priced at $224 found 2 days 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. Cheapest and Closest option available. Average driving time to city center is 8 minutes. Flights from $247
DCA
Ronald Reagan Washington National
CheapestClosest
Average driving time to city center8 min
Flights from $247
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 7 mins