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

Return flights

29 Aug - 05 Sep	easyJet
28 Aug - 31 Aug	Air Europa
24 Aug - 03 Sep	Ryanair
22 Aug - 02 Sep	easyJet
25 Aug - 01 Sep	Vueling Airlines
30 Aug - 13 Sep	Norwegian Air Sweden AOC
31 Aug - 05 Sep	easyJet
20 Aug - 25 Aug	Air Europa
19 Aug - 27 Aug	Vueling Airlines
04 Aug - 28 Aug	easyJet
05 Aug - 12 Aug	easyJet
19 Aug - 26 Aug	Vueling Airlines
01 Aug - 07 Aug	easyJet
01 Aug - 31 Aug	easyJet
01 Aug - 30 Aug	easyJet
21 Aug - 28 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 $355

Return flights