AirHint found the following cheapest return flights from Porto (OPO) to Istanbul (IST) in August 2026 (see full year).

Return flights

28 Aug - 11 Sep	easyJet
28 Aug - 05 Sep	easyJet
08 Aug - 12 Aug	Iberia
29 Aug - 12 Sep	easyJet
27 Aug - 11 Sep	easyJet
05 Aug - 09 Aug	TAP
14 Aug - 21 Aug	TAP
30 Aug - 12 Sep	easyJet
26 Aug - 04 Sep	easyJet
11 Aug - 18 Aug	easyJet
04 Aug - 12 Aug	Ryanair
18 Aug - 25 Aug	easyJet
06 Aug - 20 Aug	Air Europa
28 Aug - 04 Sep	easyJet
13 Aug - 18 Aug	LOT
26 Aug - 09 Sep	Vueling Airlines
26 Aug - 08 Sep	Vueling Airlines
07 Aug - 15 Aug	easyJet
26 Aug - 10 Sep	Vueling Airlines
07 Aug - 16 Aug	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 261€

Return flights