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

Return flights

28 Aug - 05 Sep	Lufthansa
28 Aug - 06 Sep	Lufthansa
01 Aug - 04 Aug	Lufthansa
01 Aug - 14 Aug	Lufthansa
23 Aug - 30 Aug	Lufthansa
30 Aug - 07 Sep	Lufthansa
09 Aug - 16 Aug	Lufthansa
19 Aug - 23 Aug	Eurowings

Also check the deals for one-way flights from Cologne to Ljubljana 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 Ljubljana in August from $199

Return flights