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

Return flights

05 Dec - 12 Dec	Lufthansa
08 Dec - 14 Dec	Lufthansa
01 Dec - 22 Dec	Lufthansa
04 Dec - 11 Dec	Lufthansa
08 Dec - 22 Dec	Lufthansa
04 Dec - 15 Jan	Lufthansa
08 Dec - 15 Dec	Lufthansa
15 Dec - 30 Dec	Lufthansa
15 Dec - 09 Jan	Lufthansa
02 Dec - 13 Dec	Lufthansa
30 Dec - 18 Jan	Lufthansa
26 Dec - 18 Jan	Lufthansa
30 Dec - 09 Jan	Lufthansa
09 Dec - 02 Jan	Lufthansa
05 Dec - 10 Jan	Lufthansa
08 Dec - 10 Jan	Lufthansa
12 Dec - 30 Dec	SWISS
17 Dec - 09 Jan	Lufthansa
18 Dec - 05 Jan	KLM

Also check the deals for one-way flights from London to Tehran 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 Tehran in December from 541€

Return flights