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

Return flights

27 Aug - 03 Sep	Ryanair	direct
27 Aug - 05 Sep	Ryanair	direct
27 Aug - 10 Sep	Ryanair	direct
26 Aug - 03 Sep	Eurowings	direct
28 Aug - 11 Sep	Eurowings
28 Aug - 09 Sep	Eurowings	direct
25 Aug - 03 Sep	Eurowings	direct
27 Aug - 06 Sep	Ryanair	direct
28 Aug - 05 Sep	Eurowings	direct
28 Aug - 04 Sep	Eurowings
27 Aug - 28 Aug	Ryanair
27 Aug - 29 Aug	Ryanair
27 Aug - 31 Aug	Ryanair
26 Aug - 26 Aug	Eurowings
21 Aug - 26 Aug	Eurowings
28 Aug - 28 Aug	Eurowings
21 Aug - 28 Aug	Eurowings
21 Aug - 27 Aug	Eurowings	direct
28 Aug - 30 Aug	Eurowings	direct
19 Aug - 28 Aug	Eurowings

Also check the deals for one-way flights from Cologne to Lisbon 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 Lisbon in August from $134

Return flights