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

Return flights

15 Sep - 22 Sep	KLM
29 Sep - 08 Oct	Wizz Air Malta
26 Sep - 04 Oct	Ryanair
20 Sep - 02 Oct	KLM
30 Sep - 04 Oct	Wizz Air Malta
13 Sep - 22 Sep	KLM
17 Sep - 22 Sep	Ryanair
11 Sep - 17 Sep	Air France
20 Sep - 04 Oct	KLM
24 Sep - 04 Oct	Ryanair
25 Sep - 03 Oct	Wizz Air Malta
24 Sep - 01 Oct	easyJet
24 Sep - 06 Oct	easyJet
30 Sep - 06 Oct	easyJet
19 Sep - 24 Sep	Ryanair
15 Sep - 24 Sep	KLM
17 Sep - 27 Sep	easyJet
17 Sep - 26 Sep	easyJet
15 Sep - 29 Sep	KLM
13 Sep - 24 Sep	KLM

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 156€

Return flights