Distance calculator

Great-circle distance. Enter an airport ICAO / IATA code or coordinates (for example 52.1657, 20.9671).

KNHK · Patuxent River Naval Air Station (Trapnell Field) → KBOS · Boston Logan International Airport

Distance
347.8 nm
644.2 km · 400.3 mi
Course (true)
044°
Reverse course
227°
Flight time
0:47

Straight great-circle distance, not a route. Course is true, not magnetic.