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

Return flights

28 Aug - 03 Sep	SWISS
06 Aug - 27 Aug	Iberia
25 Aug - 02 Sep	Vueling Airlines
20 Aug - 09 Sep	Vueling Airlines
21 Aug - 28 Aug	SWISS
14 Aug - 10 Sep	Wizz Air
10 Aug - 16 Aug	Aegean Airlines
07 Aug - 11 Aug	KLM
18 Aug - 28 Aug	easyJet	direct
25 Aug - 27 Aug	Vueling Airlines
06 Aug - 27 Sep	Iberia
26 Aug - 16 Sep	Vueling Airlines
26 Aug - 04 Sep	SWISS
30 Aug - 08 Sep	Volotea
14 Aug - 09 Sep	Vueling Airlines
21 Aug - 26 Aug	Vueling Airlines
30 Aug - 09 Sep	Volotea
07 Aug - 10 Aug	KLM
19 Aug - 31 Aug	Aegean Airlines
19 Aug - 27 Aug	Aegean Airlines

Also check the deals for one-way flights from Athens to Lisbon 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 Athens to Lisbon in August from $299

Return flights