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GRM to OSN: distance & flight time
Grand Marais (Grand Marais Cook County Airport) → Osan (Osan Air Base)
6,132 mi
9,869 km · 5,329 nm
12h 29m
estimated nonstop flight time
+14h
time difference · heading northwest
See live GRM→OSN fares Phone-only fares on this route — call free
Flight time details
6,132 miles nonstop takes roughly 12h 29m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 14-hour time gain when reading arrival times on your ticket.
The two airports
- GRM — Grand Marais Cook County Airport · Grand Marais, United States
- OSN — Osan Air Base · Osan, South Korea
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 OSN
- ICN · Incheon International Airport41 mi away
- SWU · Suwon Airport10 mi away
- SSN · Seoul Air Base (K-16)25 mi away
- GMP · Gimpo International Airport35 mi away
Frequently asked questions
How far is GRM from OSN?
The flight distance from Grand Marais (GRM) to Osan (OSN) is 6,132 miles (9,869 km, 5,329 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GRM to OSN?
A nonstop flight takes about 12h 29m 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 GRM to OSN?
Nonstop service on GRM–OSN 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 12h 29m nonstop estimate.
What is the time difference between Grand Marais and Osan?
Osan is 14 hours ahead of Grand Marais.
What is the cheapest way to fly from GRM to OSN?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GRM–OSN that never appear on search engines, with no booking fees.
Why are some GRM to OSN fares phone-only?
Consolidator contracts let us sell certain GRM–OSN 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.