AirHint found the following cheapest one-way flights from Cologne (CGN) to Porto (OPO) in September 2025 (see full year).

One-Way flights

30 Sep	Ryanair
25 Sep	Ryanair	direct
18 Sep	Eurowings	direct
09 Sep	Ryanair	direct
11 Sep	Eurowings	direct
23 Sep	Ryanair	direct
26 Sep	Ryanair	direct
02 Sep	Ryanair	direct
16 Sep	Ryanair
20 Sep	Ryanair

Also check the deals for return flights from Cologne to Porto in September.

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 one-way flights from Cologne to Porto in September from 59€

One-Way flights