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

Return flights

30 Sep - 07 Oct	Pegasus Airlines
23 Sep - 26 Sep	Pegasus Airlines
22 Sep - 25 Sep	Pegasus Airlines
23 Sep - 27 Sep	Pegasus Airlines
30 Sep - 30 Oct	Pegasus Airlines
15 Sep - 18 Sep	Pegasus Airlines
28 Sep - 01 Oct	Pegasus Airlines
09 Sep - 18 Sep	Pegasus Airlines
15 Sep - 19 Sep	Pegasus Airlines
28 Sep - 04 Oct	Pegasus Airlines
24 Sep - 28 Sep	Pegasus Airlines
21 Sep - 27 Sep	Pegasus Airlines
08 Sep - 20 Sep	Pegasus Airlines
08 Sep - 12 Sep	Pegasus Airlines
05 Sep - 05 Oct	Pegasus Airlines

Also check the deals for one-way flights from Istanbul 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 Istanbul to Porto in September from 161€

Return flights