AirHint found the following cheapest return flights from Istanbul (IST) to Sofia (SOF) in May 2026 (see full year).
Return flights
| 23 May - 31 May | Air Serbia | ||
| 31 May - 08 Jun | Air Serbia | ||
| 23 May - 31 May | Turkish Airlines | direct | |
| 31 May - 08 Jun | Turkish Airlines | direct | |
| 19 May - 21 May | Aegean Airlines |
Also check the deals for one-way flights from Istanbul to Sofia in May.
The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.
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