Need help booking?
Unpublished phone-only deals available
OPO to GRM: distance & flight time
Porto (Francisco de Sá Carneiro Airport) → Grand Marais (Grand Marais Cook County Airport)
3,858 mi
6,209 km · 3,352 nm
8h 2m
estimated nonstop flight time
-6h
time difference · heading northwest
See live OPO→GRM fares Phone-only fares on this route — call free
Flight time details
3,858 miles nonstop takes roughly 8h 2m gate to gate, flying northwest. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 6-hour time set-back when reading arrival times on your ticket.
The two airports
- OPO — Francisco de Sá Carneiro Airport · Porto, Portugal
- GRM — Grand Marais Cook County Airport · Grand Marais, 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 OPO
- BGZ · Braga Municipal Aerodrome26 mi away
- VRL · Vila Real Airport50 mi away
- VSE · Aerodromo Goncalves Lobato (Viseu Airport)55 mi away
- VGO · Vigo Airport68 mi away
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
Frequently asked questions
How far is OPO from GRM?
The flight distance from Porto (OPO) to Grand Marais (GRM) is 3,858 miles (6,209 km, 3,352 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from OPO to GRM?
A nonstop flight takes about 8h 2m 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 Porto and Grand Marais?
Grand Marais is 6 hours behind Porto.
What is the cheapest way to fly from OPO to GRM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on OPO–GRM that never appear on search engines, with no booking fees.