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CEI to FSI: distance & flight time
Chiang Rai (Chiang Rai International Airport) → Fort Sill (Henry Post Army Air Field (Fort Sill))
8,478 mi
13,643 km · 7,367 nm
17h 5m
estimated nonstop flight time
-12h
time difference · heading north
See live CEI→FSI fares Phone-only fares on this route — call free
Flight time details
8,478 miles nonstop takes roughly 17h 5m gate to gate, flying north. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 12-hour time set-back when reading arrival times on your ticket.
The two airports
- CEI — Chiang Rai International Airport · Chiang Rai, Thailand
- 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 CEI
- THL · Tachileik Airport37 mi away
- HOE · Ban Huoeisay Airport42 mi away
- MOG · Mong Hsat Airport56 mi away
- KET · Kengtung Airport95 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 CEI from FSI?
The flight distance from Chiang Rai (CEI) to Fort Sill (FSI) is 8,478 miles (13,643 km, 7,367 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from CEI to FSI?
A nonstop flight takes about 17h 5m 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 Chiang Rai and Fort Sill?
Fort Sill is 12 hours behind Chiang Rai.
What is the cheapest way to fly from CEI to FSI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on CEI–FSI that never appear on search engines, with no booking fees.