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

Return flights

29 Sep - 30 Oct	Flybondi
26 Sep - 14 Oct	Flybondi
24 Sep - 05 Oct	GOL Linhas Aéreas
26 Sep - 12 Oct	Flybondi
29 Sep - 12 Oct	Flybondi
22 Sep - 05 Oct	Flybondi
22 Sep - 09 Oct	Flybondi
26 Sep - 08 Oct	Flybondi
21 Sep - 08 Oct	Sky Airline
23 Sep - 03 Oct	GOL Linhas Aéreas
03 Sep - 10 Sep	Sky Airline
14 Sep - 26 Sep	Avianca
06 Sep - 13 Sep	LATAM Airlines Group
05 Sep - 12 Sep	Avianca
20 Sep - 26 Sep	Aerolineas Argentinas
08 Sep - 24 Sep	JetSmart
16 Sep - 30 Sep	JetSmart
10 Sep - 17 Sep	GOL Linhas Aéreas
11 Sep - 27 Sep	GOL Linhas Aéreas
19 Sep - 29 Sep	GOL Linhas Aéreas

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 $881

Return flights