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

Return flights

31 Aug - 09 Sep	Ryanair
31 Aug - 11 Sep	TAP
27 Aug - 03 Sep	Air Europa
30 Aug - 01 Sep	Ryanair
31 Aug - 12 Sep	TAP
07 Aug - 12 Aug	Eurowings
27 Aug - 01 Sep	Air Europa
31 Aug - 07 Sep	Ryanair
07 Aug - 14 Aug	Eurowings
22 Aug - 26 Aug	Ryanair
20 Aug - 27 Aug	Norwegian
22 Aug - 27 Aug	Ryanair
24 Aug - 27 Aug	Air Europa
28 Aug - 04 Sep	Eurowings
06 Aug - 13 Aug	TAP
26 Aug - 30 Aug	Vueling Airlines
18 Aug - 23 Aug	Air Europa
27 Aug - 05 Sep	Wizz Air Malta
18 Aug - 22 Aug	TAP
28 Aug - 01 Sep	easyJet

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 272€

Return flights