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

Return flights

02 Dec - 16 Dec	easyJet
01 Dec - 13 Dec	Ryanair
04 Dec - 13 Dec	easyJet
08 Dec - 14 Dec	easyJet
09 Dec - 22 Dec	easyJet
09 Dec - 13 Dec	easyJet
13 Dec - 22 Jan	easyJet
01 Dec - 22 Dec	easyJet
08 Dec - 22 Dec	easyJet
11 Dec - 30 Dec	easyJet
11 Dec - 28 Dec	easyJet
11 Dec - 20 Jan	easyJet
29 Dec - 19 Jan	Wizz Air Malta
11 Dec - 19 Jan	easyJet
10 Dec - 20 Jan	easyJet
26 Dec - 13 Jan	easyJet
28 Dec - 17 Jan	easyJet
20 Dec - 29 Jan	easyJet
19 Dec - 29 Jan	easyJet
11 Dec - 10 Jan	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 1111€

Return flights