AirHint found the following cheapest return flights from Cologne (CGN) to Sofia (SOF) in December 2025 (see full year).

Return flights

08 Dec - 21 Dec	Ryanair	direct
08 Dec - 28 Dec	Ryanair	direct
22 Dec - 28 Dec	Ryanair	direct
29 Dec - 03 Jan	Ryanair
29 Dec - 04 Jan	Ryanair
29 Dec - 04 Jan	Ryanair	direct
29 Dec - 03 Jan	Ryanair	direct
30 Dec - 04 Jan	Austrian Airlines
22 Dec - 07 Jan	Ryanair
22 Dec - 04 Jan	Ryanair	direct
22 Dec - 03 Jan	Ryanair	direct

Also check the deals for one-way flights from Cologne to Sofia in December.

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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Cheapest return flights from Cologne to Sofia in December from $155

Return flights