Re: イスタンブールからブルガリアのセネバルに行くバスを教えてください。

メトロ社のバスが午前9時半に近隣のブルガスには向っているようです。

Metro (International Routes: No. 107)
Daily buses from Istanbul to Sofia via Svilengrad, Haskovo and Plovdiv, depart at 09:00 am, 12:00 noon, 17:30 (5:30 pm), 20:30 (8:30 pm), 21:30 (9:30 pm) and 23:00 (11 pm).

From Sofia to Istanbul, departures are at 07:15 and 09:00 am, 12:00 noon, 17:00 (5 pm), 20:30 (8:30 pm) and 23:00 (11 pm).

Daily buses from Istanbul to Silistra via Svilengrad, Topolovgrad, Elhovo, Yanbol, Peteloçka, Kotel, Omurtak, Targoviste, Sumen, Razgrad, Isperih, Duolvo and Alfatar departing at 09:00 am.

Another daily bus goes from Istanbul to Silistra via Dereköy, Malko Tarnovo, Burgaz, Aytos, Lülekovo, Sumen, Venetz, Kliment, Isperih and Dulovo, departing at 20:00 (8 pm).

ここに記載されています。
Daily buses from Istanbul to Dobriç via Burgaz and Varna departing at 09:30 am.
Tel +90 (212) 658 1050, -1051
In Sofia: Tel +359 (2) 325131, 333281; in Plovdiv, (32) 620063