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

Return flights

24 Sep - 14 Oct	ITA Airways
30 Sep - 09 Oct	KLM
17 Sep - 14 Oct	ITA Airways
17 Sep - 08 Oct	ITA Airways
23 Sep - 15 Oct	ITA Airways
24 Sep - 29 Sep	KLM
23 Sep - 29 Sep	KLM
15 Sep - 24 Sep	KLM
29 Sep - 09 Oct	KLM
20 Sep - 24 Sep	KLM
25 Sep - 30 Sep	KLM
25 Sep - 29 Sep	KLM
20 Sep - 29 Sep	SWISS
17 Sep - 24 Sep	KLM
19 Sep - 26 Sep	KLM
18 Sep - 30 Sep	KLM
23 Sep - 09 Oct	KLM
18 Sep - 03 Oct	KLM
30 Sep - 08 Oct	KLM
15 Sep - 06 Oct	KLM

Also check the deals for one-way flights from London to Tehran in September.

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 September from 516€

Return flights