From Shumen bus to Istanbul. 9 h 58. From Shumen bus to Otogar then Metro to Aksaray. 10 h 44 min 38. From Shumen drive to Istanbul. 5 h 57 min 127. From Shumen bus to Bucharest Otopeni airport, fly to Istanbul airport, then Metro to Istanbul. 7 h 55 min 208.
Bus from Shumen to Istanbul
Metro Plus operates a bus from Shumen to Istanbul once daily. Tickets cost $30 - $55 and the journey takes 9 h.