AirHint found the following cheapest return flights from Cologne (CGN) to Sofia (SOF) in May 2026 (see full year).
Return flights
| 29 May - 05 Jun | Ryanair | direct | |
| 24 May - 05 Jun | Ryanair | direct | |
| 19 May - 22 May | Eurowings | ||
| 29 May - 31 May | Ryanair | direct | |
| 11 May - 16 May | Ryanair | ||
| 28 May - 31 May | Eurowings |
Also check the deals for one-way flights from Cologne to Sofia in May.
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