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

Return flights

23 Aug - 04 Sep	Ryanair	direct
23 Aug - 11 Sep	Ryanair
25 Aug - 04 Sep	Eurowings	direct
22 Aug - 04 Sep	Ryanair	direct
22 Aug - 16 Sep	Ryanair
27 Aug - 04 Sep	Eurowings
26 Aug - 04 Sep	Eurowings
28 Aug - 04 Sep	Eurowings	direct
23 Aug - 03 Sep	Ryanair
23 Aug - 05 Sep	Ryanair	direct
21 Aug - 30 Aug	Eurowings	direct
21 Aug - 26 Aug	Eurowings
21 Aug - 27 Aug	Eurowings
22 Aug - 28 Aug	Ryanair	direct
23 Aug - 28 Aug	Ryanair	direct
23 Aug - 30 Aug	Ryanair	direct
22 Aug - 26 Aug	Ryanair
23 Aug - 31 Aug	Ryanair
21 Aug - 31 Aug	Eurowings
22 Aug - 31 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 $165

Return flights