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

Return flights

27 Aug - 17 Sep	KLM
26 Aug - 09 Sep	KLM
29 Aug - 09 Sep	KLM
25 Aug - 04 Sep	KLM
26 Aug - 05 Sep	KLM
25 Aug - 05 Sep	KLM
18 Aug - 05 Sep	KLM
29 Aug - 05 Sep	KLM
27 Aug - 05 Sep	KLM
22 Aug - 05 Sep	KLM
05 Aug - 13 Aug	KLM
06 Aug - 13 Aug	KLM
06 Aug - 12 Aug	KLM
07 Aug - 13 Aug	KLM
04 Aug - 13 Aug	KLM
20 Aug - 28 Aug	SWISS
05 Aug - 12 Aug	KLM
15 Aug - 20 Aug	SWISS
07 Aug - 20 Aug	SWISS
08 Aug - 13 Aug	KLM

Also check the deals for one-way flights from London to Athens in August.

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 August from $272

Return flights