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

Return flights

23 May - 28 May	Air Europa
19 May - 22 May	Air Europa
19 May - 28 May	Vueling Airlines
17 May - 28 May	Vueling Airlines
24 May - 28 May	Vueling Airlines
17 May - 19 May	Vueling Airlines
21 May - 28 May	Vueling Airlines
17 May - 22 May	Vueling Airlines
19 May - 23 May	Vueling Airlines
23 May - 28 May	Turkish Airlines	direct

Also check the deals for one-way flights from Istanbul to Porto 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 Istanbul to Porto in May from 259€

Return flights