AirHint found the following cheapest return flights from Brussels (BRU) to Buenos Aires (AEP) in December 2025 (see full year).

Return flights

10 Dec - 28 Jan	British Airways
11 Dec - 29 Jan	British Airways
01 Dec - 24 Dec	British Airways
15 Dec - 15 Jan	Iberia
10 Dec - 01 Jan	British Airways
14 Dec - 15 Jan	SWISS
27 Dec - 15 Jan	SWISS
26 Dec - 16 Jan	British Airways
15 Dec - 06 Jan	Iberia
16 Dec - 28 Dec	LATAM Airlines Group
01 Dec - 09 Jan	British Airways
26 Dec - 17 Jan	SWISS

Also check the deals for one-way flights from Brussels to Buenos Aires in December.

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 Brussels to Buenos Aires in December from $1138

Return flights