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KEF to FSI: distance & flight time
Keflavik (Keflavik International Airport) → Fort Sill (Henry Post Army Air Field (Fort Sill))
3,673 mi
5,912 km · 3,192 nm
7h 40m
estimated nonstop flight time
-5h
time difference · heading west
See live KEF→FSI fares Phone-only fares on this route — call free
Flight time details
3,673 miles nonstop takes roughly 7h 40m gate to gate, flying west. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 5-hour time set-back when reading arrival times on your ticket.
The two airports
- KEF — Keflavik International Airport · Keflavik, Iceland
- 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 KEF
- RKV · Reykjavik Airport22 mi away
- GUU · Grundarfjörður Airport72 mi away
- VEY · Vestmannaeyjar Airport81 mi away
- PFJ · Patreksfjörður Airport116 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 KEF from FSI?
The flight distance from Keflavik (KEF) to Fort Sill (FSI) is 3,673 miles (5,912 km, 3,192 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from KEF to FSI?
A nonstop flight takes about 7h 40m 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 Keflavik and Fort Sill?
Fort Sill is 5 hours behind Keflavik.
What is the cheapest way to fly from KEF to FSI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on KEF–FSI that never appear on search engines, with no booking fees.