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

Return flights

06 May - 11 May	easyJet
09 May - 08 Jun	easyJet
16 May - 19 May	Ryanair
09 May - 19 May	easyJet
12 May - 18 May	Vueling Airlines
23 May - 31 May	Air Europa
06 May - 13 May	easyJet
15 May - 20 May	easyJet
14 May - 20 May	Vueling Airlines
23 May - 30 May	Air Europa
07 May - 14 May	easyJet
30 May - 06 Jun	easyJet
30 May - 13 Jun	easyJet
31 May - 10 Jun	Air Serbia
13 May - 02 Jun	Vueling Airlines
31 May - 12 Jun	Air Serbia
26 May - 01 Jun	Vueling Airlines
31 May - 13 Jun	Air Serbia
31 May - 11 Jun	Air Serbia
13 May - 01 Jun	Vueling 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 174€

Return flights