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

Return flights

03 Dec - 08 Dec	Air France
03 Dec - 10 Dec	Air France
04 Dec - 10 Dec	KLM
05 Dec - 07 Dec	Air France
03 Dec - 12 Dec	Ryanair
01 Dec - 04 Dec	Ryanair
02 Dec - 12 Dec	easyJet
06 Dec - 13 Dec	Ryanair
08 Dec - 22 Jan	Norse Atlantic Airways (UK)
31 Dec - 25 Jan	Ryanair
06 Dec - 14 Dec	Vueling Airlines
04 Dec - 07 Dec	Ryanair
29 Dec - 22 Jan	Ryanair
30 Dec - 18 Jan	Ryanair
31 Dec - 20 Jan	Ryanair
30 Dec - 17 Jan	Ryanair
08 Dec - 19 Jan	Norse Atlantic Airways (UK)
31 Dec - 17 Jan	Ryanair
30 Dec - 31 Jan	Ryanair
06 Dec - 19 Jan	Norse Atlantic Airways (UK)

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 855€

Return flights