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

Return flights

01 Dec - 07 Dec	LATAM Airlines Group
01 Dec - 08 Dec	LATAM Airlines Group
05 Dec - 14 Dec	TAP
05 Dec - 15 Dec	TAP
03 Dec - 13 Dec	LATAM Airlines Group
01 Dec - 15 Dec	LATAM Airlines Group
06 Dec - 15 Dec	TAP
29 Dec - 23 Jan	Air Canada
04 Dec - 11 Dec	Air Canada
06 Dec - 16 Dec	Avianca
15 Dec - 15 Jan	Brussels Airlines
05 Dec - 12 Dec	LATAM Airlines Group
28 Dec - 19 Jan	Vueling Airlines
30 Dec - 18 Jan	LATAM Airlines Group
31 Dec - 18 Jan	LATAM Airlines Group
15 Dec - 22 Jan	Air Canada
25 Dec - 18 Jan	Vueling Airlines
13 Dec - 24 Jan	LATAM Airlines Group
13 Dec - 22 Jan	LATAM Airlines Group
08 Dec - 17 Jan	LATAM Airlines Group

Also check the deals for one-way flights from London 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 London to Buenos Aires in December from $1194

Return flights