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DEC to USM: distance & flight time
Decatur (Decatur Airport) → Ko Samui (Samui Airport)
8,977 mi
14,447 km · 7,801 nm
18h 4m
estimated nonstop flight time
+12h
time difference · heading north
See live DEC→USM fares Phone-only fares on this route — call free
Flight time details
8,977 miles nonstop takes roughly 18h 4m 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
- DEC — Decatur Airport · Decatur, United States
- USM — Samui Airport · Ko Samui, 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 DEC
Near USM
- URT · Surat Thani Airport69 mi away
- NST · Nakhon Si Thammarat Airport70 mi away
- CJM · Chumphon Airport93 mi away
- UNN · Ranong Airport102 mi away
Frequently asked questions
How far is DEC from USM?
The flight distance from Decatur (DEC) to Ko Samui (USM) is 8,977 miles (14,447 km, 7,801 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from DEC to USM?
A nonstop flight takes about 18h 4m gate to gate. Actual time varies with winds, routing and season — eastbound transatlantic flights, for example, are usually faster than the return.
Are there nonstop flights from DEC to USM?
Nonstop service on DEC–USM depends on the season and the day of week. Run the fare search on this page with the nonstop filter applied to see current direct options; when there is no nonstop, a single connection through a carrier hub adds roughly 2–4 hours to the 18h 4m nonstop estimate.
What is the time difference between Decatur and Ko Samui?
Ko Samui is 12 hours ahead of Decatur.
What is the cheapest way to fly from DEC to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on DEC–USM that never appear on search engines, with no booking fees.
Why are some DEC to USM fares phone-only?
Consolidator contracts let us sell certain DEC–USM tickets below the price airlines permit us to publish online, so those fares can only be quoted over the phone. Call the travel desk and an agent will check phone-only inventory for your dates.