AirHint found the following cheapest return flights from Porto (OPO) to Istanbul (IST) in October 2025 (see full year).

Return flights

09 Oct - 13 Oct	Ryanair
09 Oct - 14 Oct	easyJet
02 Oct - 06 Oct	easyJet
19 Oct - 22 Oct	Air Europa
09 Oct - 12 Oct	easyJet
08 Oct - 14 Oct	Ryanair
08 Oct - 15 Oct	easyJet
10 Oct - 14 Oct	Ryanair
08 Oct - 13 Oct	easyJet
09 Oct - 15 Oct	easyJet
31 Oct - 04 Nov	easyJet
30 Oct - 02 Nov	easyJet
29 Oct - 03 Nov	easyJet
22 Oct - 12 Nov	Vueling Airlines
22 Oct - 05 Nov	Vueling Airlines
27 Oct - 03 Nov	Air Europa
30 Oct - 03 Nov	easyJet
31 Oct - 03 Nov	Ryanair
23 Oct - 02 Nov	Ryanair
19 Oct - 06 Nov	Air Europa

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

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 October from 165€

Return flights