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

Return flights

03 Oct - 07 Oct	Vueling Airlines
07 Oct - 12 Oct	Transavia France
02 Oct - 08 Oct	Ryanair
07 Oct - 11 Oct	Ryanair
08 Oct - 11 Oct	Ryanair
06 Oct - 10 Oct	easyJet
11 Oct - 14 Oct	easyJet
10 Oct - 13 Oct	Ryanair
15 Oct - 20 Oct	Ryanair
01 Oct - 03 Oct	Ryanair
28 Oct - 01 Nov	easyJet
25 Oct - 01 Nov	easyJet
17 Oct - 05 Nov	Vueling Airlines
22 Oct - 05 Nov	Vueling Airlines
27 Oct - 05 Nov	Vueling Airlines
28 Oct - 05 Nov	Vueling Airlines
15 Oct - 05 Nov	Vueling Airlines
17 Oct - 07 Nov	Vueling Airlines
22 Oct - 12 Nov	Vueling Airlines
22 Oct - 07 Nov	Vueling Airlines

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.

Book a cheap hotel in Istanbul

Cheap car rent in Istanbul

Cheapest return flights from Porto to Istanbul in October from $220

Return flights