Need help booking?
Unpublished phone-only deals available
GAI to PRM: distance & flight time
Gaithersburg (Montgomery County Airpark) → Portimao (Portimão Airport)
3,636 mi
5,851 km · 3,159 nm
7h 36m
estimated nonstop flight time
+5h
time difference · heading east
See live GAI→PRM fares Phone-only fares on this route — call free
Flight time details
3,636 miles nonstop takes roughly 7h 36m gate to gate, flying east. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 5-hour time gain when reading arrival times on your ticket.
The two airports
- GAI — Montgomery County Airpark · Gaithersburg, United States
- PRM — Portimão Airport · Portimao, Portugal
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 GAI
Near PRM
- FAO · Faro Airport35 mi away
- BYJ · Beja Airport / Airbase73 mi away
- CAT · Cascais Airport117 mi away
- LIS · Humberto Delgado Airport (Lisbon Portela Airport)117 mi away
Frequently asked questions
How far is GAI from PRM?
The flight distance from Gaithersburg (GAI) to Portimao (PRM) is 3,636 miles (5,851 km, 3,159 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GAI to PRM?
A nonstop flight takes about 7h 36m 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 Gaithersburg and Portimao?
Portimao is 5 hours ahead of Gaithersburg.
What is the cheapest way to fly from GAI to PRM?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GAI–PRM that never appear on search engines, with no booking fees.