Need help booking?
Unpublished phone-only deals available
FNL to SIR: distance & flight time
Fort Collins (Northern Colorado Regional Airport) → Sion (Sion Airport)
5,143 mi
8,277 km · 4,469 nm
10h 33m
estimated nonstop flight time
+8h
time difference · heading northeast
See live FNL→SIR fares Phone-only fares on this route — call free
Flight time details
5,143 miles nonstop takes roughly 10h 33m gate to gate, flying northeast. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 8-hour time gain when reading arrival times on your ticket.
The two airports
- FNL — Northern Colorado Regional Airport · Fort Collins, United States
- SIR — Sion Airport · Sion, Switzerland
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 FNL
- DEN · Denver International Airport45 mi away
- GXY · Greeley–Weld County Airport20 mi away
- WBU · Boulder Municipal Airport31 mi away
- BJC · Rocky Mountain Metropolitan Airport38 mi away
Near SIR
- AOT · Aosta Airport33 mi away
- QLS · Lausanne-Blécherette Airport41 mi away
- ZIN · Interlaken Air Base41 mi away
- MVV · Megève Airport43 mi away
Frequently asked questions
How far is FNL from SIR?
The flight distance from Fort Collins (FNL) to Sion (SIR) is 5,143 miles (8,277 km, 4,469 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from FNL to SIR?
A nonstop flight takes about 10h 33m 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 time difference between Fort Collins and Sion?
Sion is 8 hours ahead of Fort Collins.
What is the cheapest way to fly from FNL to SIR?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on FNL–SIR that never appear on search engines, with no booking fees.