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

Return flights

24 Sep - 09 Oct	LATAM Airlines Group
21 Sep - 21 Oct	LATAM Airlines Group
22 Sep - 21 Oct	LATAM Airlines Group
24 Sep - 01 Oct	Air Canada
29 Sep - 10 Oct	Avianca
24 Sep - 08 Oct	LATAM Airlines Group
29 Sep - 09 Oct	Avianca
29 Sep - 20 Oct	Turkish Airlines
18 Sep - 07 Oct	Arajet
23 Sep - 03 Oct	Ethiopian Airlines
08 Sep - 15 Sep	GOL Linhas Aéreas
10 Sep - 17 Sep	Avianca
13 Sep - 23 Sep	Avianca
10 Sep - 24 Sep	ITA Airways
15 Sep - 19 Sep	Arajet
16 Sep - 30 Sep	Avianca
09 Sep - 30 Sep	Avianca
06 Sep - 25 Sep	Copa
14 Sep - 30 Sep	Avianca
10 Sep - 30 Sep	LATAM Airlines Group

Also check the deals for one-way flights from Buenos Aires 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 Buenos Aires to Lisbon in September from $1130

Return flights