Alton/St Louis to Denver (ALN–DEN) — Airlines, Schedules & Connections

ALN Airport Page →
783 mi airlines 0/wk
On-time Some delays Frequent delays
Flight Schedule 0 flights Verified 2w ago
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  Flight Airline AC Dep Arr Dur OTP Sched  

No flights match your filters.

No nonstop flights on this route. connecting options below.

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Alton/St Louis to Denver
Connecting service available through multiple hubs.
783 mi 3h 7m nonstop -2h behind 5 1-stop hubs

While no nonstop service exists between ALN and DEN, connecting options are available through 5 hubs.

Also explore ALN Routes DEN Routes ALN Live Flights DEN Live Flights DEN Delays
Connections

Connection Landscape

Beyond nonstop. 1-stop and 2-stop options for ALN to DEN.
1-STOP
One-Stop Connections
5
Hubs
~5h
Fastest
~9h
Longest
BNA ~5h 14m MSY ~6h 4m SRQ ~8h 46m EWR ~8h 58m LAX ~9h 19m
Verified with published schedule alignment and minimum connection time.
Connections computed from published schedules with minimum connection time verification. Use the interactive explorer above the fold to filter by airline, tier, and layover time.
Reliability

On-Time Performance

What to expect at each end of your journey.
Outbound
ALN → DEN
82%
Generally reliable. Most flights run on time.
Arriving
82%
Return
DEN → ALN
74%
Moderate delays possible. Allow buffer time.
Departing
74%
OTP = percentage of flights arriving within 15 min of schedule. Based on airport-level delay snapshots. DEN delays →
Alternatives

Other ways to reach Denver from Alton/St Louis

Nearby airports with service to Denver International Airport.
Metric ALN→DEN STL→DEN COU→DEN
Distance from ALN – 20 mi 117 mi
Nonstop airlines 0 5 1
Weekly flights 0 149 7
Flight time 3h 7m 2h 20m 2h 25m
St Louis (STL) to Denver flights · Columbia (COU) to Denver flights · Peoria (PIA) to Denver flights
Airports within 200 miles of ALN with service to Denver International Airport.
Know before you go

Travel Essentials

Practical planning for this route.
Time Difference
-2h
Denver is 2 hours behind Alton/St Louis.
ALN: EDT · DEN: MDT

When it's 6:00 PM in Alton/St Louis, it's 4:00 PM in Denver.
Distance & Flight Time
783 mi / 1,261 km
Nonstop flight time is approximately 3h 7m.
Getting from DEN

RTD A Line runs to Denver Union Station (37 min, $10.50) with connections to light rail and bus routes. Taxis have meters; expect $55–65 to downtown.DEN's tent-roof Jeppesen Terminal is a single building; all three concourses connect via the underground automated train. Rental cars are on level 5. For ski resorts, shuttle services depart from Ground Transportation.

Denver Climate

Semi-arid with 300+ days of sunshine. Summers are dry and warm (27–34°C) with afternoon thunderstorms that produce dramatic but brief delays. Winters bring cold temperatures (−8 to 5°C) and heavy blizzards that can shut down ground operations.

Spring snowstorms can be heavier than midwinter ones. Altitude (5,430 ft) means low humidity year-round; stay hydrated.

Check current weather forecasts before travel.
Facts

ALN–DEN Quick Facts

Key statistics for the Alton/St Louis to Denver route.
Route details
Distance783 mi / 1,261 km
Flight time3h 7m
Time difference-2 hours
Airlines (nonstop)0
1-stop connections5 hubs
Origin: ALN
Full nameSt Louis Regional Airport
IATA / ICAOALN / KALN
TimezoneAmerica/Indiana/Vincennes
Elevation544 ft / 166 m
Destination: DEN
Full nameDenver International Airport
IATA / ICAODEN / KDEN
TimezoneAmerica/Denver
Passengers/yr82.4M
Elevation5,431 ft / 1,655 m
FAQ

Frequently Asked Questions

Common questions about ALN to DEN flights.
Nonstop flights from St Louis Regional Airport to Denver International Airport take approximately 3h 7m. The route covers 783 miles.
Yes, 1-stop connections are available through BNA, MSY, SRQ, EWR and LAX. These options provide additional schedule flexibility.
Denver is 2 hours behind Alton/St Louis.
Nearby alternatives include STL, COU and PIA. See the Alternatives section for a full comparison.
Click the 'Search Flights' button to check availability and prices on Google Flights. You can also compare airlines and schedules on this page to find the best option.
See the On-Time Performance section for the latest delay data at both airports. This shows departure and arrival reliability to help you plan.
Route data is updated regularly from official airline schedules. On-time performance data comes from recent airport delay snapshots.

Flights from ALN to DEN

St Louis Regional Airport (ALN) and Denver International Airport (DEN) are connected through multiple connecting hub airports.

ALN to DEN Flight Duration and Schedule

Nonstop flight time from ALN to DEN ranges from 3 hours 7 minutes. The route covers a distance of 783 miles (1,261 km).

Connecting Options and Alternatives

5 one-stop connections are available, with the fastest taking approximately 5 hours via BNA. Nearby alternative airports include St Louis (STL), Columbia (COU) and Peoria (PIA).