Sofia Airport — Sofia, Bulgaria

Sofia Airport, coded SOF, serves one of Europe's oldest continuously inhabited capitals from a site along the city's eastern outskirts, with Mount Vitosha's forested slopes visible on the horizon and popular with Sofia residents for weekend hiking and skiing. A modern Terminal 2, opened in 2006, substantially expanded the airport's capacity as Bulgaria's tourism and low-cost carrier traffic grew following the country's 2007 accession to the European Union. Sofia itself layers Roman ruins, an active Orthodox cathedral, Ottoman-era mosques, and Communist-era architecture within a compact walkable center, giving arriving passengers a dense historical cross-section within minutes of leaving SOF's terminal. The airport functions as Bulgaria's principal international gateway, handling both leisure travelers connecting onward to Black Sea beach resorts or Balkan ski destinations and the steady business traffic tied to Sofia's growing role as a regional outsourcing and technology hub.