AirHint found the following cheapest return flights from Frankfurt (FRA) to Sofia (SOF) in May 2026 (see full year).
Return flights
| 28 May - 31 May | Lufthansa | direct | |
| 16 May - 05 Jun | Lufthansa | direct | |
| 14 May - 17 May | Air Serbia | ||
| 14 May - 19 May | Air Serbia | ||
| 03 May - 07 May | Lufthansa | ||
| 14 May - 19 May | Lufthansa | direct |
Also check the deals for one-way flights from Frankfurt to Sofia in May.
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