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

Return flights

28 Aug - 20 Sep	LATAM Airlines Group
19 Aug - 26 Aug	TAP
19 Aug - 31 Aug	LATAM Airlines Group
24 Aug - 08 Sep	LATAM Airlines Group
26 Aug - 31 Aug	Azul Airlines
25 Aug - 09 Sep	LATAM Airlines Group
22 Aug - 29 Aug	TAP
23 Aug - 30 Aug	Air Europa
26 Aug - 09 Sep	LATAM Airlines Group
22 Aug - 28 Aug	LATAM Airlines Group
15 Aug - 16 Sep	LATAM Airlines Group
05 Aug - 19 Aug	LATAM Airlines Group
23 Aug - 06 Sep	LATAM Airlines Group
06 Aug - 13 Aug	Air Europa
15 Aug - 16 Aug	LATAM Airlines Group
11 Aug - 28 Aug	Ryanair

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

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 August from $1130

Return flights