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

Return flights

31 Aug - 09 Sep	Air Europa
28 Aug - 11 Sep	easyJet
31 Aug - 10 Sep	Air Europa
31 Aug - 07 Sep	easyJet
29 Aug - 02 Sep	easyJet
25 Aug - 29 Sep	Ryanair
30 Aug - 03 Sep	easyJet
25 Aug - 01 Sep	Air Europa
25 Aug - 28 Aug	Air Europa
31 Aug - 04 Sep	easyJet
26 Aug - 29 Aug	Air Europa
26 Aug - 28 Aug	Air Europa
28 Aug - 30 Aug	easyJet
25 Aug - 02 Sep	Ryanair
22 Aug - 27 Aug	Ryanair
23 Aug - 27 Aug	Vueling Airlines
23 Aug - 26 Aug	Norwegian Air Sweden AOC
23 Aug - 30 Aug	Norwegian Air Sweden AOC
26 Aug - 26 Aug	easyJet
21 Aug - 29 Aug	Ryanair

Also check the deals for one-way flights from Porto to Istanbul in August.

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 August from 294€

Return flights