Baikal International Airport — Ulan Ude, Russia

Baikal International Airport, coded UUD, serves Ulan-Ude, the capital of the Buryatia republic in Russia's Siberian southeast, near Lake Baikal, the world's deepest freshwater lake. Ulan-Ude sits along the Trans-Siberian Railway and has long served as a crossroads between Russia, Mongolia, and China, a role the airport extends into the air travel era with flights to Moscow, Irkutsk, and other Russian cities. The city carries a distinct Buryat Mongol cultural identity, visible in its Buddhist temples and datsans, and UUD has occasionally handled seasonal or charter connections tied to tourism around Lake Baikal's eastern shore, a quieter counterpart to the more heavily visited western side near Irkutsk. Cold winters shape travel patterns, and the airport remains primarily a domestic gateway supporting Buryatia's administrative and cultural life.