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

Return flights

24 Sep - 15 Oct	Pegasus Airlines
29 Sep - 13 Oct	AJet
30 Sep - 10 Oct	AJet
23 Sep - 13 Oct	AJet
11 Sep - 04 Oct	AJet
15 Sep - 13 Oct	AJet
15 Sep - 20 Oct	AJet
03 Sep - 23 Sep	Pegasus Airlines
16 Sep - 03 Oct	Pegasus Airlines
28 Sep - 09 Oct	Pegasus Airlines
10 Sep - 08 Oct	AJet
03 Sep - 30 Sep	Ryanair
02 Sep - 30 Sep	Pegasus Airlines
03 Sep - 24 Sep	Pegasus Airlines
08 Sep - 30 Sep	Ryanair
07 Sep - 16 Sep	Ryanair
15 Sep - 22 Sep	AJet
02 Sep - 22 Sep	SunExpress
01 Sep - 30 Sep	Ryanair
01 Sep - 25 Sep	Ryanair

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 294€

Return flights