AirHint found the following cheapest return flights from Bremen (BRE) to Porto (OPO) in September 2025 (see full year).

Return flights

30 Sep - 14 Oct	Ryanair
23 Sep - 09 Oct	Ryanair
29 Sep - 03 Oct	Ryanair
22 Sep - 26 Sep	Ryanair
30 Sep - 15 Oct	Ryanair
27 Sep - 30 Sep	Ryanair
20 Sep - 24 Sep	Ryanair
29 Sep - 01 Oct	Ryanair
23 Sep - 30 Sep	Ryanair
15 Sep - 18 Sep	Ryanair
30 Sep - 02 Oct	Ryanair
26 Sep - 03 Oct	Ryanair
23 Sep - 25 Sep	Ryanair
20 Sep - 30 Sep	Ryanair
15 Sep - 24 Sep	Ryanair
22 Sep - 02 Oct	Ryanair
20 Sep - 25 Sep	Ryanair
20 Sep - 23 Sep	Ryanair
20 Sep - 04 Oct	Ryanair
28 Sep - 04 Oct	KLM

Also check the deals for one-way flights from Bremen 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 Bremen to Porto in September from 145€

Return flights