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

Return flights

15 Apr - 22 Apr	Vueling Airlines
24 Apr - 28 Apr	Air Europa
13 Apr - 20 Apr	Air Europa
16 Apr - 22 Apr	Vueling Airlines
17 Apr - 22 Apr	easyJet
09 Apr - 16 Apr	Ryanair
24 Apr - 27 Apr	easyJet
22 Apr - 26 Apr	easyJet
30 Apr - 06 May	easyJet
24 Apr - 08 May	easyJet
16 Apr - 26 Apr	Vueling Airlines
13 Apr - 21 Apr	Air Europa
29 Apr - 05 May	Ryanair
30 Apr - 04 May	easyJet
26 Apr - 01 May	easyJet
30 Apr - 05 May	easyJet
23 Apr - 11 May	Vueling Airlines
18 Apr - 02 May	Ryanair
30 Apr - 03 May	easyJet
27 Apr - 03 May	easyJet

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

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 April from 133€

Return flights