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

Return flights

02 Sep - 21 Oct	SWISS
12 Sep - 27 Sep	LATAM Airlines Group
19 Sep - 16 Oct	SWISS
14 Sep - 21 Sep	LATAM Airlines Group
02 Sep - 28 Sep	SWISS
01 Sep - 29 Sep	LATAM Airlines Group
04 Sep - 18 Sep	TAP
01 Sep - 30 Sep	Air France
15 Sep - 22 Sep	LATAM Airlines Group
16 Sep - 30 Sep	Azul Airlines
30 Sep - 14 Oct	SWISS
07 Sep - 20 Sep	LATAM Airlines Group
18 Sep - 17 Oct	Lufthansa
27 Sep - 11 Oct	LATAM Airlines Group
13 Sep - 06 Oct	TAP
01 Sep - 15 Sep	LATAM Airlines Group
12 Sep - 17 Oct	Iberia For Level

Also check the deals for one-way flights from Lisbon to Buenos Aires 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 Buenos Aires in September from 855€

Return flights