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

Return flights

02 Sep - 09 Sep	KLM
03 Sep - 09 Sep	KLM
08 Sep - 18 Sep	KLM
09 Sep - 17 Sep	KLM
09 Sep - 18 Sep	KLM
29 Sep - 09 Oct	KLM
23 Sep - 09 Oct	KLM
23 Sep - 29 Sep	ITA Airways
23 Sep - 30 Sep	ITA Airways
02 Sep - 30 Sep	ITA Airways
01 Sep - 30 Sep	ITA Airways
08 Sep - 16 Sep	KLM
29 Sep - 10 Oct	KLM
22 Sep - 02 Oct	ITA Airways
29 Sep - 02 Oct	ITA Airways
24 Sep - 01 Oct	ITA Airways
15 Sep - 02 Oct	ITA Airways
16 Sep - 02 Oct	ITA Airways
18 Sep - 02 Oct	ITA Airways
15 Sep - 05 Oct	ITA Airways

Also check the deals for one-way flights from London to Athens 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 Athens in September from $272

Return flights