AirHint found the following cheapest return flights from Cologne (CGN) to Thessaloniki (SKG) in September 2025 (see full year).

Return flights

26 Sep - 12 Oct	Eurowings
27 Sep - 10 Oct	Eurowings
26 Sep - 01 Oct	Eurowings
29 Sep - 08 Oct	Aegean Airlines
29 Sep - 06 Oct	Aegean Airlines
26 Sep - 09 Oct	Eurowings
27 Sep - 01 Oct	Eurowings
26 Sep - 07 Oct	Eurowings
26 Sep - 06 Oct	Eurowings
29 Sep - 09 Oct	Aegean Airlines
26 Sep - 30 Sep	Eurowings
27 Sep - 30 Sep	Eurowings
16 Sep - 18 Sep	Eurowings
16 Sep - 17 Sep	Eurowings
22 Sep - 24 Sep	Eurowings
20 Sep - 27 Sep	Eurowings
22 Sep - 30 Sep	Aegean Airlines
25 Sep - 27 Sep	Aegean Airlines
19 Sep - 23 Sep	Eurowings
16 Sep - 24 Sep	Eurowings

Also check the deals for one-way flights from Cologne to Thessaloniki in September.

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 Thessaloniki in September from 131€

Return flights