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

Return flights

27 Aug - 03 Sep	Lufthansa
18 Aug - 27 Aug	Lufthansa
21 Aug - 28 Aug	Lufthansa
19 Aug - 28 Aug	Lufthansa
21 Aug - 26 Aug	Ryanair
17 Aug - 22 Aug	Lufthansa
16 Aug - 23 Aug	Lufthansa
14 Aug - 23 Aug	Lufthansa
13 Aug - 21 Aug	Lufthansa
15 Aug - 22 Aug	Lufthansa
20 Aug - 24 Aug	Ryanair

Also check the deals for one-way flights from Cologne to Helsinki 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 Helsinki in August from $216

Return flights