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

Return flights

27 Aug - 07 Sep	Norwegian Air Sweden AOC
29 Aug - 07 Sep	easyJet
27 Aug - 03 Sep	Norwegian Air Sweden AOC
28 Aug - 08 Sep	Air Europa
28 Aug - 07 Sep	easyJet
30 Aug - 08 Sep	easyJet
31 Aug - 09 Sep	Ryanair
26 Aug - 31 Aug	Ryanair
31 Aug - 07 Sep	Ryanair
31 Aug - 05 Sep	Ryanair
24 Aug - 02 Sep	Air Europa
25 Aug - 27 Aug	Air Europa
27 Aug - 29 Aug	Norwegian Air Sweden AOC
25 Aug - 28 Aug	Air Europa
30 Aug - 31 Aug	Ryanair
26 Aug - 28 Aug	Air Europa
24 Aug - 31 Aug	Air Europa
22 Aug - 26 Aug	Air Europa
20 Aug - 25 Aug	TAP
20 Aug - 24 Aug	TAP

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 $331

Return flights