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

Return flights

04 Dec - 22 Jan	easyJet
08 Dec - 14 Dec	easyJet
08 Dec - 15 Dec	easyJet
11 Dec - 22 Jan	easyJet
24 Dec - 22 Jan	easyJet
06 Dec - 20 Dec	easyJet
13 Dec - 21 Dec	easyJet
01 Dec - 20 Dec	easyJet
29 Dec - 13 Jan	easyJet
20 Dec - 22 Jan	Ryanair
20 Dec - 24 Jan	Ryanair
11 Dec - 06 Jan	easyJet
07 Dec - 25 Dec	easyJet
17 Dec - 15 Jan	easyJet
13 Dec - 06 Jan	easyJet
20 Dec - 25 Jan	Ryanair
17 Dec - 28 Dec	easyJet

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 1087€

Return flights