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

Return flights

01 Dec - 10 Dec	Air Europa
10 Dec - 14 Dec	Air Europa
12 Dec - 15 Dec	Air Europa
01 Dec - 11 Dec	Air Europa
12 Dec - 14 Dec	Air Europa
12 Dec - 16 Dec	Air Europa
11 Dec - 16 Dec	Air Europa
01 Dec - 04 Dec	Air Europa
09 Dec - 10 Dec	easyJet
11 Dec - 14 Dec	Air Europa
31 Dec - 08 Jan	Vueling Airlines
23 Dec - 08 Jan	Vueling Airlines
22 Dec - 08 Jan	Vueling Airlines
31 Dec - 04 Jan	SunExpress
21 Dec - 08 Jan	Vueling Airlines
30 Dec - 03 Jan	easyJet
29 Dec - 02 Jan	Ryanair
26 Dec - 04 Jan	Ryanair
17 Dec - 05 Jan	Vueling Airlines
25 Dec - 14 Jan	Vueling Airlines

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

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 December from 96€

Return flights