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

Return flights

28 Aug - 15 Sep	easyJet
28 Aug - 08 Sep	easyJet
26 Aug - 08 Sep	Air Serbia
29 Aug - 09 Sep	Air Serbia
28 Aug - 10 Sep	easyJet
28 Aug - 17 Sep	Volotea
27 Aug - 17 Sep	Volotea
28 Aug - 02 Sep	easyJet
31 Aug - 15 Sep	Wizz Air
26 Aug - 03 Sep	Air Serbia
26 Aug - 28 Aug	Air Serbia
25 Aug - 28 Aug	Wizz Air
20 Aug - 28 Aug	Wizz Air
24 Aug - 28 Aug	Wizz Air
24 Aug - 29 Aug	Iberia
28 Aug - 29 Aug	Volotea
27 Aug - 29 Aug	Volotea
27 Aug - 28 Aug	Volotea
19 Aug - 21 Aug	Lufthansa
26 Aug - 30 Aug	Air Serbia

Also check the deals for one-way flights from Lisbon 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 Lisbon to Athens in August from 267€

Return flights