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

Return flights

02 Dec - 09 Dec	KLM
16 Dec - 22 Dec	KLM
01 Dec - 03 Dec	SWISS
04 Dec - 08 Dec	SWISS
04 Dec - 07 Dec	SWISS
03 Dec - 10 Dec	KLM
04 Dec - 09 Dec	KLM
06 Dec - 07 Dec	SWISS
01 Dec - 08 Dec	British Airways
05 Dec - 07 Dec	SWISS
15 Dec - 05 Jan	KLM
30 Dec - 04 Jan	KLM
10 Dec - 18 Jan	KLM
09 Dec - 13 Jan	KLM
13 Dec - 04 Jan	KLM
11 Dec - 07 Jan	ITA Airways
11 Dec - 19 Jan	ITA Airways
01 Dec - 01 Jan	ITA Airways
31 Dec - 25 Jan	KLM
10 Dec - 13 Jan	KLM

Also check the deals for one-way flights from London 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 London to Istanbul in December from 180€

Return flights