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

Return flights

29 Aug - 19 Sep	Ryanair	direct
29 Aug - 12 Sep	Ryanair	direct
29 Aug - 15 Sep	Ryanair	direct
25 Aug - 12 Sep	Ryanair	direct
25 Aug - 15 Sep	Ryanair	direct
29 Aug - 03 Sep	Ryanair
22 Aug - 12 Sep	Ryanair	direct
29 Aug - 05 Sep	Ryanair
29 Aug - 08 Sep	Ryanair	direct
29 Aug - 31 Aug	Ryanair
28 Aug - 30 Aug	Eurowings
29 Aug - 01 Sep	Ryanair	direct
27 Aug - 30 Aug	Ryanair
26 Aug - 30 Aug	Eurowings
21 Aug - 29 Aug	Ryanair
26 Aug - 31 Aug	Eurowings
26 Aug - 28 Aug	Eurowings
21 Aug - 28 Aug	Ryanair
25 Aug - 29 Aug	Ryanair
21 Aug - 25 Aug	Eurowings

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

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 August from $164

Return flights