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

Return flights

28 Aug - 15 Sep	Ryanair
30 Aug - 04 Sep	Norwegian Air Sweden AOC
28 Aug - 04 Sep	Ryanair
27 Aug - 31 Aug	Air Europa
04 Aug - 07 Aug	Wizz Air Malta
20 Aug - 27 Aug	TAP
26 Aug - 29 Aug	Ryanair
08 Aug - 12 Sep	Ryanair
12 Aug - 19 Aug	Vueling Airlines
19 Aug - 27 Aug	Ryanair
07 Aug - 15 Aug	Ryanair
05 Aug - 12 Aug	Ryanair
30 Aug - 06 Sep	Ryanair
07 Aug - 14 Aug	Ryanair
06 Aug - 09 Aug	Ryanair
27 Aug - 05 Sep	Ryanair
26 Aug - 05 Sep	Aegean Airlines
25 Aug - 06 Sep	Ryanair
23 Aug - 06 Sep	Air Europa
28 Aug - 17 Sep	Vueling Airlines

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 262€

Return flights