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GRM to FSI: distance & flight time
Grand Marais (Grand Marais Cook County Airport) → Fort Sill (Henry Post Army Air Field (Fort Sill))
1,001 mi
1,610 km · 870 nm
2h 39m
estimated nonstop flight time
Same time
time difference · heading southwest
See live GRM→FSI fares Phone-only fares on this route — call free
Flight time details
1,001 miles nonstop takes roughly 2h 39m gate to gate, flying southwest. Add 45–90 minutes per connection if there's no nonstop service. Both airports share the same local time, so schedules read exactly as flown.
The two airports
- GRM — Grand Marais Cook County Airport · Grand Marais, United States
- FSI — Henry Post Army Air Field (Fort Sill) · Fort Sill, United States
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 FSI
- LAW · Lawton Fort Sill Regional Airport6 mi away
- DUC · Halliburton Field28 mi away
- HBR · Hobart Regional Airport44 mi away
- SPS · Sheppard Air Force Base-Wichita Falls Municipal Airport46 mi away
Frequently asked questions
How far is GRM from FSI?
The flight distance from Grand Marais (GRM) to Fort Sill (FSI) is 1,001 miles (1,610 km, 870 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GRM to FSI?
A nonstop flight takes about 2h 39m 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 cheapest way to fly from GRM to FSI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GRM–FSI that never appear on search engines, with no booking fees.