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

Return flights

27 Aug - 29 Aug	Eurowings
24 Aug - 29 Aug	Turkish Airlines
28 Aug - 29 Aug	Ryanair
23 Aug - 29 Aug	Turkish Airlines
26 Aug - 29 Aug	Turkish Airlines
25 Aug - 29 Aug	Turkish Airlines
21 Aug - 24 Aug	Lufthansa
22 Aug - 24 Aug	Eurowings
22 Aug - 29 Aug	Lufthansa

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 $393

Return flights