$249 Cheap Delta flights St. Louis (STL) to Denver (DEN)

View $249 flight on Tue, Dec 23, 2025Opens in a new window

$249 Cheap Delta flights St. Louis (STL) to Denver (DEN)

Prices were available within the past 7 days and start at $249 for one-way flights and $427 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Delta
Thu, Dec 25 - Tue, Dec 30
STL
St. Louis
DEN
Denver
$427 Roundtrip, found 1 day ago
$427
Roundtrip
found 1 day ago
Select Delta flight, departing Thu, Dec 25 from St. Louis to Denver, returning Tue, Dec 30, priced at $427 found 1 day ago

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

February is typically the cheapest month to fly

From $54 - $214 per traveler.

Alternative airports near Denver

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Denver Intl. DEN. Cheapest option available. Average driving time to city center is 32 minutes. Flights from $417
DEN
Denver Intl.
Cheapest
Average driving time to city center32 min
Flights from $417
Flights from St. Louis (STL) to Denver (DEN)
Origin airport
Lambert-St. Louis Intl.
Destination airport
Denver Intl.
Airlines serving
American Airlines, Delta, Frontier Airlines
Popular airline
Frontier Airlines
Distance
1228 km
Average flight time
1 hour 20 mins