International Vlak (международни влак) (IV)

International express trains connect Bulgaria with its neighbouring countries. Currently there are the following international trains to/from Bulgaria:

- Sofia to Belgrade: day train; 2nd class only; no seat reservation required
- Sofia to Thessaloniki: day train; 2nd class only; seat reservation compulsory
- Sofia to Bucharest: day train; 2nd class only; no seat reservation required
- Sofia to Istanbul (Halkali): night train, couchette and sleeper carriages only
- Bucharest to Istanbul (Halkali) via Ruse - Veliko Tarnovo: night train, couchette and sleeper carriages only
- Vidin to Craiova: regional train; 2nd class only; no seat reservation required; connecting train from Sofia to Vidin available

Sofia - Belgrade | Sofia - Thessaloniki | Sofia - Bucharest | Sofia - Istanbul