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SIR to FSI: distance & flight time
Sion (Sion Airport) → Fort Sill (Henry Post Army Air Field (Fort Sill))
5,193 mi
8,357 km · 4,512 nm
10h 39m
estimated nonstop flight time
-7h
time difference · heading northwest
See live SIR→FSI fares Phone-only fares on this route — call free
Flight time details
5,193 miles nonstop takes roughly 10h 39m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 7-hour time set-back when reading arrival times on your ticket.
The two airports
- SIR — Sion Airport · Sion, Switzerland
- FSI — Henry Post Army Air Field (Fort Sill) · Fort Sill, 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 SIR
- AOT · Aosta Airport33 mi away
- QLS · Lausanne-Blécherette Airport41 mi away
- ZIN · Interlaken Air Base41 mi away
- MVV · Megève Airport43 mi away
Near FSI
- LAW · Lawton Fort Sill Regional Airport6 mi away
- DUC · Halliburton Field28 mi away
- HBR · Hobart Regional Airport44 mi away
- SPS · Sheppard Air Force Base-Wichita Falls Municipal Airport46 mi away
Frequently asked questions
How far is SIR from FSI?
The flight distance from Sion (SIR) to Fort Sill (FSI) is 5,193 miles (8,357 km, 4,512 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SIR to FSI?
A nonstop flight takes about 10h 39m 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 Sion and Fort Sill?
Fort Sill is 7 hours behind Sion.
What is the cheapest way to fly from SIR to FSI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SIR–FSI that never appear on search engines, with no booking fees.