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

Return flights

17 Sep - 22 Sep	Ryanair
22 Sep - 26 Sep	Wizz Air Malta
11 Sep - 16 Sep	easyJet
18 Sep - 23 Sep	Ryanair
20 Sep - 26 Sep	Wizz Air Malta
16 Sep - 26 Sep	Ryanair
20 Sep - 24 Sep	Wizz Air Malta
05 Sep - 09 Sep	Volotea
19 Sep - 24 Sep	Ryanair
15 Sep - 20 Sep	Wizz Air Malta
26 Sep - 08 Oct	Ryanair
25 Sep - 02 Oct	Ryanair
17 Sep - 06 Oct	Vueling Airlines
26 Sep - 06 Oct	Vueling Airlines
24 Sep - 14 Oct	Vueling Airlines
24 Sep - 12 Oct	Vueling Airlines
24 Sep - 09 Oct	Vueling Airlines
24 Sep - 01 Oct	Vueling Airlines
24 Sep - 08 Oct	Vueling Airlines
24 Sep - 11 Oct	Vueling Airlines

Also check the deals for one-way flights from Porto to Istanbul 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 Porto to Istanbul in September from 179€

Return flights