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

Return flights

29 Oct - 11 Nov	Azul Airlines
26 Oct - 18 Nov	Azul Airlines
28 Oct - 10 Nov	LATAM Airlines Group
27 Oct - 09 Nov	LATAM Airlines Group
26 Oct - 02 Nov	Azul Airlines
26 Oct - 30 Nov	Azul Airlines
01 Oct - 03 Nov	Ryanair
16 Oct - 24 Oct	Azul Airlines
22 Oct - 19 Nov	LATAM Airlines Group
31 Oct - 08 Nov	LATAM Airlines Group
23 Oct - 30 Oct	LATAM Airlines Group
26 Oct - 08 Nov	LATAM Airlines Group
13 Oct - 19 Oct	Air Europa
01 Oct - 11 Oct	Ryanair
04 Oct - 25 Oct	LATAM Airlines Group
03 Oct - 15 Oct	Azul Airlines
19 Oct - 22 Oct	Ryanair
07 Oct - 15 Oct	Azul Airlines
19 Oct - 26 Oct	TAAG Angola Airlines
03 Oct - 13 Oct	Azul Airlines

Also check the deals for one-way flights from Lisbon to Buenos Aires in October.

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 October from $991

Return flights