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

Return flights

02 Dec - 06 Dec	easyJet
05 Dec - 09 Dec	easyJet
06 Dec - 08 Dec	easyJet
06 Dec - 09 Dec	easyJet
05 Dec - 07 Dec	easyJet
13 Dec - 15 Dec	Ryanair
06 Dec - 16 Dec	easyJet
15 Dec - 18 Dec	Wizz Air Malta
14 Dec - 18 Dec	Ryanair
28 Dec - 04 Jan	Ryanair
26 Dec - 30 Dec	Ryanair
30 Dec - 03 Jan	Transavia France
20 Dec - 04 Jan	Ryanair

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 $210

Return flights