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

Return flights

21 Aug - 09 Sep	Ryanair	direct
28 Aug - 18 Sep	Ryanair
19 Aug - 18 Sep	Ryanair	direct
22 Aug - 09 Sep	Ryanair	direct
19 Aug - 09 Sep	Ryanair	direct
25 Aug - 09 Sep	Eurowings
28 Aug - 22 Sep	Ryanair
26 Aug - 16 Sep	Ryanair	direct
21 Aug - 28 Aug	Ryanair	direct
21 Aug - 06 Sep	Ryanair	direct
13 Aug - 13 Sep	Eurowings
21 Aug - 26 Aug	Ryanair
22 Aug - 29 Aug	Ryanair	direct
19 Aug - 29 Aug	Ryanair	direct
21 Aug - 31 Aug	Ryanair
19 Aug - 26 Aug	Ryanair
19 Aug - 28 Aug	Ryanair
26 Aug - 30 Aug	Ryanair
25 Aug - 30 Aug	Ryanair
19 Aug - 28 Aug	Ryanair	direct

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 147€

Return flights