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

Return flights

19 Aug - 26 Aug	Aegean Airlines
25 Aug - 31 Aug	Lufthansa
19 Aug - 28 Aug	Aegean Airlines
10 Aug - 17 Aug	Lufthansa
10 Aug - 17 Aug	Turkish Airlines	direct
19 Aug - 26 Aug	Turkish Airlines	direct
25 Aug - 31 Aug	Turkish Airlines	direct

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 299€

Return flights