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

Return flights

17 Jul - 20 Jul	Lufthansa
13 Jul - 03 Aug	Lufthansa
21 Jul - 28 Jul	Lufthansa
12 Jul - 22 Jul	Lufthansa
21 Jul - 26 Jul	Lufthansa
10 Jul - 17 Jul	Lufthansa
11 Jul - 13 Jul	Lufthansa
06 Jul - 24 Jul	Lufthansa
06 Jul - 13 Jul	Lufthansa
04 Jul - 06 Jul	Eurowings
04 Jul - 11 Jul	Lufthansa

Also check the deals for one-way flights from Cologne to Ljubljana in July.

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 July from 241€

Return flights