AirHint found the following cheapest return flights from Karlsruhe/Baden-Baden (FKB) to Porto (OPO) in September 2025 (see full year).

Return flights

28 Sep - 07 Oct	Ryanair
27 Sep - 30 Sep	Ryanair
30 Sep - 07 Oct	Ryanair
28 Sep - 07 Oct	Ryanair	direct
24 Sep - 30 Sep	Ryanair
29 Sep - 08 Oct	Ryanair
28 Sep - 06 Oct	Ryanair
30 Sep - 06 Oct	Ryanair
29 Sep - 06 Oct	Ryanair
28 Sep - 06 Oct	Ryanair	direct
28 Sep - 30 Sep	Ryanair
26 Sep - 06 Oct	Ryanair
28 Sep - 14 Oct	Ryanair	direct
22 Sep - 23 Sep	Ryanair
23 Sep - 26 Sep	Ryanair
20 Sep - 26 Sep	Ryanair
19 Sep - 24 Sep	Ryanair
22 Sep - 29 Sep	Ryanair
22 Sep - 26 Sep	Ryanair
19 Sep - 23 Sep	Ryanair

Also check the deals for one-way flights from Karlsruhe/Baden-Baden 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 return flights from Karlsruhe/Baden-Baden to Porto in September from 124€

Return flights