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

Return flights

23 Sep - 01 Oct	Ryanair
29 Sep - 15 Oct	Ryanair	direct
29 Sep - 09 Oct	Ryanair	direct
29 Sep - 17 Oct	Ryanair	direct
29 Sep - 10 Oct	Ryanair	direct
24 Sep - 01 Oct	Ryanair
29 Sep - 16 Oct	Ryanair	direct
29 Sep - 03 Oct	Ryanair
24 Sep - 09 Oct	Ryanair	direct
15 Sep - 25 Sep	Ryanair
28 Sep - 03 Oct	Ryanair
15 Sep - 23 Sep	Ryanair
15 Sep - 18 Sep	Ryanair
23 Sep - 25 Sep	Ryanair
16 Sep - 23 Sep	Ryanair
09 Sep - 16 Sep	Ryanair
11 Sep - 16 Sep	Ryanair
11 Sep - 23 Sep	Ryanair
02 Sep - 23 Sep	Ryanair
09 Sep - 25 Sep	Ryanair

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 125€

Return flights