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

Return flights

25 Sep - 30 Sep	Ryanair
24 Sep - 15 Oct	easyJet
16 Sep - 24 Sep	easyJet
24 Sep - 14 Oct	easyJet
23 Sep - 07 Oct	easyJet
30 Sep - 07 Oct	easyJet
16 Sep - 18 Sep	easyJet
23 Sep - 06 Oct	easyJet
30 Sep - 14 Oct	easyJet
30 Sep - 06 Oct	easyJet
22 Sep - 08 Oct	easyJet
25 Sep - 29 Sep	Ryanair
17 Sep - 22 Sep	Vueling Airlines
16 Sep - 23 Sep	easyJet
20 Sep - 24 Sep	easyJet
24 Sep - 30 Sep	easyJet
20 Sep - 13 Oct	easyJet
08 Sep - 15 Sep	Wizz Air Malta
22 Sep - 13 Oct	easyJet
16 Sep - 20 Sep	easyJet

Also check the deals for one-way flights from Athens to Lisbon 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 Athens to Lisbon in September from 139€

Return flights