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

Return flights

17 Sep - 08 Oct	easyJet
29 Sep - 01 Oct	Ryanair
29 Sep - 02 Oct	Ryanair
29 Sep - 05 Oct	Ryanair
29 Sep - 06 Oct	Ryanair
29 Sep - 07 Oct	Ryanair
29 Sep - 30 Sep	Ryanair
25 Sep - 23 Oct	easyJet	direct
18 Sep - 08 Oct	easyJet
30 Sep - 01 Oct	Ryanair
25 Sep - 20 Oct	easyJet	direct
21 Sep - 24 Sep	Iberia
17 Sep - 25 Sep	easyJet
15 Sep - 23 Sep	Volotea
23 Sep - 30 Sep	easyJet
17 Sep - 24 Sep	easyJet
15 Sep - 25 Sep	Volotea
17 Sep - 20 Sep	easyJet
26 Sep - 29 Sep	Pegasus Airlines
21 Sep - 26 Sep	Aegean Airlines

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 179€

Return flights