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

Return flights

26 Sep - 28 Sep	easyJet
11 Sep - 22 Sep	easyJet
19 Sep - 23 Sep	easyJet
18 Sep - 22 Sep	easyJet
24 Sep - 28 Sep	easyJet
26 Sep - 30 Sep	easyJet
25 Sep - 28 Sep	easyJet
19 Sep - 24 Sep	easyJet
19 Sep - 22 Sep	easyJet
27 Sep - 29 Sep	easyJet
30 Sep - 13 Oct	easyJet
25 Sep - 02 Oct	easyJet
27 Sep - 04 Oct	easyJet
26 Sep - 05 Oct	easyJet
25 Sep - 05 Oct	easyJet
27 Sep - 01 Oct	easyJet

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 156€

Return flights