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APA to ALN: distance & flight time
Denver (Centennial Airport) → Alton/St Louis (St Louis Regional Airport)
793 mi
1,276 km · 689 nm
2h 11m
estimated nonstop flight time
—
time difference · heading east
See live APA→ALN fares Phone-only fares on this route — call free
Flight time details
793 miles nonstop takes roughly 2h 11m gate to gate, flying east. Add 45–90 minutes per connection if there's no nonstop service. Both airports share the same local time, so schedules read exactly as flown.
The two airports
- APA — Centennial Airport · Denver, United States
- ALN — St Louis Regional Airport · Alton/St Louis, United States
Distances are great-circle ("as the crow flies") — the same basis airlines use for frequent-flyer miles.
Alternate airports can cut this fare
Flying from or into a nearby airport is the #1 trick our agents use to beat online prices. Call and we'll compare every combination on one call.
Near APA
- DEN · Denver International Airport22 mi away
- BFK · Buckley Air Force Base10 mi away
- BJC · Rocky Mountain Metropolitan Airport27 mi away
- WBU · Boulder Municipal Airport38 mi away
Near ALN
- STL · St Louis Lambert International Airport20 mi away
- BLV · Scott AFB/Midamerica Airport26 mi away
- SUS · Spirit of St Louis Airport36 mi away
- SPI · Abraham Lincoln Capital Airport69 mi away
Frequently asked questions
How far is APA from ALN?
The flight distance from Denver (APA) to Alton/St Louis (ALN) is 793 miles (1,276 km, 689 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from APA to ALN?
A nonstop flight takes about 2h 11m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
What is the cheapest way to fly from APA to ALN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on APA–ALN that never appear on search engines, with no booking fees.