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

Return flights

03 Dec - 10 Dec	easyJet
08 Dec - 11 Dec	easyJet
07 Dec - 12 Dec	easyJet
01 Dec - 08 Dec	easyJet
12 Dec - 15 Dec	easyJet
06 Dec - 13 Dec	easyJet
01 Dec - 07 Dec	easyJet
09 Dec - 14 Dec	easyJet
10 Dec - 17 Dec	easyJet
05 Dec - 08 Dec	easyJet
21 Dec - 02 Jan	TAP
30 Dec - 06 Jan	easyJet
19 Dec - 04 Jan	easyJet
24 Dec - 01 Jan	Ryanair
26 Dec - 04 Jan	Ryanair
29 Dec - 05 Jan	Ryanair
27 Dec - 01 Jan	easyJet

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 157€

Return flights