Need help booking?
Unpublished phone-only deals available
FSI to CNX: distance & flight time
Fort Sill (Henry Post Army Air Field (Fort Sill)) → Chiang Mai (Chiang Mai International Airport)
8,574 mi
13,798 km · 7,450 nm
17h 17m
estimated nonstop flight time
+12h
time difference · heading north
See live FSI→CNX fares Phone-only fares on this route — call free
Flight time details
8,574 miles nonstop takes roughly 17h 17m gate to gate, flying north. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 12-hour time gain when reading arrival times on your ticket.
The two airports
- FSI — Henry Post Army Air Field (Fort Sill) · Fort Sill, United States
- CNX — Chiang Mai International Airport · Chiang Mai, Thailand
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 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
Near CNX
- LPT · Lampang Airport49 mi away
- PYY · Mae Hong Son Airport54 mi away
- HGN · Mae Hong Son Airport74 mi away
- PRH · Phrae Airport90 mi away
Frequently asked questions
How far is FSI from CNX?
The flight distance from Fort Sill (FSI) to Chiang Mai (CNX) is 8,574 miles (13,798 km, 7,450 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from FSI to CNX?
A nonstop flight takes about 17h 17m 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 Sill and Chiang Mai?
Chiang Mai is 12 hours ahead of Fort Sill.
What is the cheapest way to fly from FSI to CNX?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on FSI–CNX that never appear on search engines, with no booking fees.