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GRM to KOS: distance & flight time
Grand Marais (Grand Marais Cook County Airport) → Sihanoukville (Sihanoukville International Airport)
8,310 mi
13,373 km · 7,221 nm
16h 46m
estimated nonstop flight time
+12h
time difference · heading north
See live GRM→KOS fares Phone-only fares on this route — call free
Flight time details
8,310 miles nonstop takes roughly 16h 46m 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
- GRM — Grand Marais Cook County Airport · Grand Marais, United States
- KOS — Sihanoukville International Airport · Sihanoukville, Cambodia
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 GRM
- YQT · Thunder Bay Airport61 mi away
- LYU · Ely Municipal Airport67 mi away
- YIB · Atikokan Municipal Airport87 mi away
- CMX · Houghton County Memorial Airport100 mi away
Near KOS
- PQC · Phu Quoc International Airport37 mi away
- PNH · Phnom Penh International Airport106 mi away
- VKG · Rach Gia Airport110 mi away
- KZC · Kampong Chhnang Airport132 mi away
Frequently asked questions
How far is GRM from KOS?
The flight distance from Grand Marais (GRM) to Sihanoukville (KOS) is 8,310 miles (13,373 km, 7,221 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GRM to KOS?
A nonstop flight takes about 16h 46m 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 Grand Marais and Sihanoukville?
Sihanoukville is 12 hours ahead of Grand Marais.
What is the cheapest way to fly from GRM to KOS?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GRM–KOS that never appear on search engines, with no booking fees.