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

Return flights

04 Dec - 07 Dec	KLM
02 Dec - 08 Dec	KLM
02 Dec - 14 Dec	KLM
04 Dec - 14 Dec	KLM
09 Dec - 16 Dec	Lufthansa
11 Dec - 15 Dec	KLM
17 Dec - 24 Dec	Lufthansa
16 Dec - 13 Jan	Lufthansa
11 Dec - 14 Dec	KLM
10 Dec - 11 Dec	Lufthansa
16 Dec - 19 Dec	Lufthansa
15 Dec - 07 Jan	Lufthansa
11 Dec - 11 Jan	KLM
30 Dec - 06 Jan	Lufthansa
16 Dec - 06 Jan	Lufthansa
23 Dec - 08 Jan	Lufthansa
05 Dec - 07 Jan	Lufthansa
17 Dec - 05 Jan	Lufthansa
23 Dec - 12 Jan	Lufthansa
15 Dec - 05 Jan	Lufthansa

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 $262

Return flights