Short answer: Sofia, Bucharest, Sarajevo, Skopje, Tirana — all $2 base cost on TenDollarPick.
Eastern Europe and the Balkans deliver the best European value. Sofia (Bulgaria), Bucharest (Romania), Sarajevo (Bosnia), Skopje (North Macedonia), Tirana (Albania) all at $2 base. Western Europe minimum: Lisbon, Porto, Athens at $3. See full European cities ranked.