Grabtsevo Airport — Kaluga, Russia

Grabtsevo Airport serves Kaluga, a city southwest of Moscow known for its aerospace and space-exploration heritage, notably its connection to rocket scientist Konstantin Tsiolkovsky. KLF functions as a regional airport handling limited domestic flights and general aviation activity, reflecting Kaluga's status as a mid-sized industrial and administrative center rather than a major air travel hub. The city has grown as a manufacturing base for automotive and electronics industries in recent decades, which has occasionally spurred discussion of expanding air links at Grabtsevo. Passenger traffic at KLF has historically been modest, with service levels shaped by Russia's broader domestic aviation network and demand between Kaluga and Moscow.