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DEC to GAI: distance & flight time
Decatur (Decatur Airport) → Gaithersburg (Montgomery County Airpark)
625 mi
1,006 km · 543 nm
1h 50m
estimated nonstop flight time
+1h
time difference · heading east
See live DEC→GAI fares Phone-only fares on this route — call free
Flight time details
625 miles nonstop takes roughly 1h 50m gate to gate, flying east. Add 45–90 minutes per connection if there's no nonstop service. Remember to factor the 1-hour time gain when reading arrival times on your ticket.
The two airports
- DEC — Decatur Airport · Decatur, United States
- 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.
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Frequently asked questions
How far is DEC from GAI?
The flight distance from Decatur (DEC) to Gaithersburg (GAI) is 625 miles (1,006 km, 543 nautical miles), measured along the great-circle route airlines actually fly.
How long is the flight from DEC to GAI?
A nonstop flight takes about 1h 50m 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 Decatur and Gaithersburg?
Gaithersburg is 1 hour ahead of Decatur.
What is the cheapest way to fly from DEC to GAI?
Compare live fares online, then call CheapoTrav — our agents have unpublished consolidator fares on DEC–GAI that never appear on search engines, with no booking fees.