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GAI to LIS: distance & flight time
Gaithersburg (Montgomery County Airpark) → Lisbon (Humberto Delgado Airport (Lisbon Portela Airport))
3,562 mi
5,733 km · 3,096 nm
7h 27m
estimated nonstop flight time
+5h
time difference · heading northeast
See live GAI→LIS fares Phone-only fares on this route — call free
Flight time details
3,562 miles nonstop takes roughly 7h 27m gate to gate, flying northeast. 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
- LIS — Humberto Delgado Airport (Lisbon Portela Airport) · Lisbon, 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 LIS
- AVR · Alverca Air Base9 mi away
- CAT · Cascais Airport12 mi away
- QLR · Monte Real Air Base74 mi away
- BYJ · Beja Airport / Airbase81 mi away
Frequently asked questions
How far is GAI from LIS?
The flight distance from Gaithersburg (GAI) to Lisbon (LIS) is 3,562 miles (5,733 km, 3,096 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from GAI to LIS?
A nonstop flight takes about 7h 27m 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 Lisbon?
Lisbon is 5 hours ahead of Gaithersburg.
What is the cheapest way to fly from GAI to LIS?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on GAI–LIS that never appear on search engines, with no booking fees.