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

Return flights

17 Sep - 24 Sep	easyJet
29 Sep - 16 Oct	easyJet
03 Sep - 10 Sep	easyJet
01 Sep - 10 Sep	easyJet
30 Sep - 07 Oct	easyJet
01 Sep - 11 Sep	easyJet
02 Sep - 30 Sep	easyJet
02 Sep - 09 Sep	easyJet
12 Sep - 17 Sep	easyJet
04 Sep - 09 Sep	easyJet
09 Sep - 23 Sep	Transavia France
20 Sep - 01 Oct	Transavia France
27 Sep - 01 Oct	Transavia France
08 Sep - 16 Sep	easyJet
27 Sep - 11 Oct	easyJet
27 Sep - 08 Oct	easyJet
25 Sep - 01 Oct	Transavia France
20 Sep - 11 Oct	Transavia France
27 Sep - 03 Oct	Transavia France
29 Sep - 09 Oct	Ryanair	direct

Also check the deals for one-way flights from Berlin 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 Berlin to Porto in September from $166

Return flights