Need help booking?
Unpublished phone-only deals available
DCM to GAI: distance & flight time
Castres (Castres-Mazamet Airport) → Gaithersburg (Montgomery County Airpark)
3,969 mi
6,388 km · 3,449 nm
8h 15m
estimated nonstop flight time
-6h
time difference · heading northwest
See live DCM→GAI fares Phone-only fares on this route — call free
Flight time details
3,969 miles nonstop takes roughly 8h 15m 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
- DCM — Castres-Mazamet Airport · Castres, France
- GAI — Montgomery County Airpark · Gaithersburg, 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 DCM
- CCF · Carcassonne Airport24 mi away
- LBI · Albi-Le Séquestre Airport26 mi away
- TLS · Toulouse-Blagnac Airport47 mi away
- XMW · Montauban Airport56 mi away
Near GAI
Frequently asked questions
How far is DCM from GAI?
The flight distance from Castres (DCM) to Gaithersburg (GAI) is 3,969 miles (6,388 km, 3,449 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from DCM to GAI?
A nonstop flight takes about 8h 15m 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 Castres and Gaithersburg?
Gaithersburg is 6 hours behind Castres.
What is the cheapest way to fly from DCM to GAI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on DCM–GAI that never appear on search engines, with no booking fees.