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

Return flights

12 Aug - 19 Aug	Air Serbia
13 Aug - 19 Aug	KLM
25 Aug - 02 Sep	KLM
25 Aug - 03 Sep	KLM
22 Aug - 27 Aug	Air Serbia
04 Aug - 12 Aug	KLM
13 Aug - 21 Aug	KLM
27 Aug - 08 Sep	Wizz Air
19 Aug - 04 Sep	Air Serbia
12 Aug - 21 Aug	Air Serbia
05 Aug - 12 Aug	Air Serbia
13 Aug - 27 Aug	KLM
28 Aug - 01 Sep	Wizz Air
30 Aug - 10 Sep	TAP
24 Aug - 01 Sep	Wizz Air
19 Aug - 29 Sep	Air Serbia
25 Aug - 31 Aug	KLM
26 Aug - 04 Sep	easyJet
10 Aug - 19 Aug	TAP
27 Aug - 06 Sep	KLM

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 201€

Return flights