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

Return flights

24 Sep - 29 Sep	easyJet
24 Sep - 30 Sep	easyJet
17 Sep - 23 Sep	easyJet
22 Sep - 29 Sep	easyJet
18 Sep - 30 Sep	easyJet
23 Sep - 29 Sep	easyJet
18 Sep - 04 Oct	easyJet
23 Sep - 30 Sep	easyJet
18 Sep - 23 Sep	easyJet
16 Sep - 22 Sep	easyJet
15 Sep - 18 Sep	easyJet
18 Sep - 11 Oct	easyJet
30 Sep - 03 Oct	easyJet
29 Sep - 02 Oct	easyJet
15 Sep - 01 Oct	easyJet
30 Sep - 05 Oct	easyJet
29 Sep - 03 Oct	easyJet
25 Sep - 07 Oct	easyJet
22 Sep - 01 Oct	Vueling Airlines
27 Sep - 01 Oct	easyJet

Also check the deals for one-way flights from Lisbon 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 Lisbon to Athens in September from $160

Return flights