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SDF to USM: distance & flight time
Louisville (Louisville International Standiford Field) → Ko Samui (Samui Airport)
9,118 mi
14,675 km · 7,924 nm
18h 21m
estimated nonstop flight time
+11h
time difference · heading north
See live SDF→USM fares Phone-only fares on this route — call free
Flight time details
9,118 miles nonstop takes roughly 18h 21m gate to gate, flying north. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 11-hour time gain when reading arrival times on your ticket.
The two airports
- SDF — Louisville International Standiford Field · Louisville, 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 SDF
- LOU · Bowman Field5 mi away
- FTK · Godman Army Air Field22 mi away
- FFT · Capital City Airport45 mi away
- LEX · Blue Grass Airport62 mi away
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 SDF from USM?
The flight distance from Louisville (SDF) to Ko Samui (USM) is 9,118 miles (14,675 km, 7,924 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from SDF to USM?
A nonstop flight takes about 18h 21m 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 Louisville and Ko Samui?
Ko Samui is 11 hours ahead of Louisville.
What is the cheapest way to fly from SDF to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on SDF–USM that never appear on search engines, with no booking fees.