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

Return flights

01 Dec - 11 Dec	Wizz Air Malta
03 Dec - 06 Dec	easyJet
05 Dec - 10 Dec	easyJet
05 Dec - 08 Dec	easyJet
01 Dec - 14 Dec	Wizz Air Malta
31 Dec - 28 Jan	easyJet
05 Dec - 12 Dec	easyJet
03 Dec - 29 Jan	easyJet
06 Dec - 14 Dec	easyJet
05 Dec - 24 Jan	easyJet
04 Dec - 16 Dec	easyJet
04 Dec - 11 Dec	Wizz Air Malta
04 Dec - 09 Dec	easyJet
06 Dec - 31 Jan	easyJet
05 Dec - 31 Jan	easyJet
12 Dec - 24 Jan	easyJet
03 Dec - 31 Jan	easyJet
31 Dec - 21 Jan	easyJet
30 Dec - 21 Jan	easyJet
29 Dec - 20 Jan	Ryanair

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 907€

Return flights