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

Return flights

19 May - 21 May	Air Europa
09 May - 16 May	easyJet
06 May - 20 May	Lufthansa
09 May - 20 May	Lufthansa
16 May - 21 May	easyJet
17 May - 21 May	easyJet
11 May - 19 May	Lufthansa
08 May - 15 May	Lufthansa
16 May - 30 May	Lufthansa
06 May - 13 May	Turkish Airlines

Also check the deals for one-way flights from Porto to Istanbul in May.

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 May from $277

Return flights