Denver to St Louis
DENSTL
Fly from Denver to St Louis starting at USD 42 with Frontier Airlines.
Best fare available on Sep 30, 2026.
Limited seats. Better plans. Book before it's gone.
Denver to St Louis cheapest flights this week
Denver to St Louis monthly flight fare trend
Aug
from USD 62
Sep
from USD 42
Oct
from USD 61
Nov
No flights
Dec
No flights
Jan
No flights
Airport Details
Origin
Denver
Denver International Airport (DEN)
Denver, DEN
Zone
Denver
Elev
5431 ft
Destination
St Louis
St. Louis Lambert International Airport (STL)
St Louis, STL
Zone
Chicago
Elev
618 ft
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