$174 Cheap American Airlines flights Denver (DEN) to St. Louis (STL)

View $174 flight on Wed, Dec 17, 2025Opens in a new window

$174 Cheap American Airlines flights Denver (DEN) to St. Louis (STL)

Prices were available within the past 7 days and start at $174 for one-way flights and $387 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Wed, Dec 17 - Wed, Dec 24
DEN
Denver
STL
St. Louis
$387 Roundtrip, found 4 days ago
$387
Roundtrip
found 4 days ago
Select American Airlines flight, departing Wed, Dec 17 from Denver to St. Louis, returning Wed, Dec 24, priced at $387 found 4 days ago

Find the cheapest month to fly from Denver (DEN) to St. Louis (STL)

February is typically the cheapest month to fly

From $53 - $212 per traveler.
Flights from Denver (DEN) to St. Louis (STL)
Origin airport
Denver Intl.
Destination airport
Lambert-St. Louis Intl.
Distance
1228 km
Average flight time
3 hours 1 min