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CAT to USM: distance & flight time
Cascais (Cascais Airport) → Ko Samui (Samui Airport)
6,822 mi
10,980 km · 5,929 nm
13h 51m
estimated nonstop flight time
+6h
time difference · heading east
See live CAT→USM fares Phone-only fares on this route — call free
Flight time details
6,822 miles nonstop takes roughly 13h 51m gate to gate, flying east. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 6-hour time gain when reading arrival times on your ticket.
The two airports
- CAT — Cascais Airport · Cascais, Portugal
- 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 CAT
- LIS · Humberto Delgado Airport (Lisbon Portela Airport)12 mi away
- AVR · Alverca Air Base21 mi away
- QLR · Monte Real Air Base80 mi away
- BYJ · Beja Airport / Airbase89 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 CAT from USM?
The flight distance from Cascais (CAT) to Ko Samui (USM) is 6,822 miles (10,980 km, 5,929 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from CAT to USM?
A nonstop flight takes about 13h 51m 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 Cascais and Ko Samui?
Ko Samui is 6 hours ahead of Cascais.
What is the cheapest way to fly from CAT to USM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on CAT–USM that never appear on search engines, with no booking fees.