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

Return flights

25 Aug - 18 Sep	Ryanair
28 Aug - 18 Sep	Ryanair
26 Aug - 09 Sep	Ryanair	direct
25 Aug - 18 Sep	Eurowings	direct
25 Aug - 19 Sep	Ryanair
29 Aug - 09 Sep	Ryanair	direct
25 Aug - 04 Sep	Ryanair
29 Aug - 18 Sep	Ryanair	direct
28 Aug - 04 Sep	Ryanair
21 Aug - 09 Sep	Ryanair	direct
14 Aug - 30 Aug	Ryanair	direct
19 Aug - 28 Aug	Ryanair
03 Aug - 06 Aug	Ryanair
21 Aug - 30 Aug	Eurowings
26 Aug - 30 Aug	Ryanair	direct
16 Aug - 30 Aug	Eurowings
23 Aug - 30 Aug	Ryanair
14 Aug - 28 Aug	Ryanair	direct
25 Aug - 29 Aug	Ryanair
11 Aug - 30 Aug	Ryanair

Also check the deals for one-way flights from Cologne to Porto 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 Porto in August from $164

Return flights