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

Return flights

30 Sep - 21 Oct	Pegasus Airlines
30 Sep - 18 Oct	AJet
29 Sep - 07 Oct	AJet
30 Sep - 04 Oct	AJet
30 Sep - 03 Oct	AJet
25 Sep - 25 Oct	Pegasus Airlines
01 Sep - 05 Oct	AJet
20 Sep - 11 Oct	AJet
16 Sep - 08 Oct	Pegasus Airlines
16 Sep - 16 Oct	AJet
01 Sep - 21 Sep	Pegasus Airlines
02 Sep - 21 Sep	Pegasus Airlines
06 Sep - 22 Sep	AJet
06 Sep - 21 Sep	AJet
16 Sep - 24 Sep	AJet
13 Sep - 20 Sep	Pegasus Airlines
02 Sep - 16 Sep	Pegasus Airlines
03 Sep - 21 Sep	Pegasus Airlines
01 Sep - 20 Sep	Pegasus Airlines
14 Sep - 27 Sep	Pegasus Airlines

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 250€

Return flights