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

Return flights

16 Sep - 08 Oct	Air Europa
17 Sep - 29 Sep	Air Europa
29 Sep - 07 Oct	Ryanair
25 Sep - 09 Oct	easyJet
16 Sep - 24 Sep	Air Europa
25 Sep - 30 Sep	easyJet
25 Sep - 03 Oct	easyJet
16 Sep - 19 Sep	Air Europa
17 Sep - 30 Sep	Air Europa
30 Sep - 09 Oct	easyJet
17 Sep - 20 Sep	Air Europa
29 Sep - 03 Oct	Ryanair
30 Sep - 08 Oct	easyJet
23 Sep - 08 Oct	Wizz Air Malta
24 Sep - 08 Oct	easyJet
30 Sep - 30 Sep	easyJet
16 Sep - 23 Sep	Air Europa
25 Sep - 02 Oct	easyJet
16 Sep - 18 Sep	Air Europa
22 Sep - 29 Sep	Wizz Air

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 $189

Return flights