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

Return flights

24 Sep - 10 Oct	Ryanair	direct
29 Sep - 09 Oct	Ryanair	direct
28 Sep - 09 Oct	Ryanair	direct
30 Sep - 15 Oct	Ryanair
27 Sep - 15 Oct	Ryanair
27 Sep - 16 Oct	Ryanair
30 Sep - 17 Oct	Ryanair
24 Sep - 09 Oct	Ryanair	direct
27 Sep - 09 Oct	Ryanair
26 Sep - 15 Oct	Ryanair
18 Sep - 25 Sep	Jet2
18 Sep - 23 Sep	Jet2
22 Sep - 30 Sep	Ryanair
28 Sep - 30 Sep	Ryanair
22 Sep - 26 Sep	Ryanair
25 Sep - 30 Sep	Ryanair
18 Sep - 24 Sep	Jet2
18 Sep - 26 Sep	Jet2
22 Sep - 23 Sep	Ryanair
18 Sep - 25 Sep	Jet2	direct

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 $109

Return flights