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

Return flights

01 Dec - 11 Dec	Air Europa
07 Dec - 17 Dec	Air Europa
04 Dec - 11 Dec	Vueling Airlines
01 Dec - 15 Dec	Air Europa
01 Dec - 17 Dec	Air Europa
05 Dec - 14 Dec	Air Europa
06 Dec - 13 Dec	Vueling Airlines
02 Dec - 10 Dec	Vueling Airlines
04 Dec - 21 Dec	Vueling Airlines
08 Dec - 15 Dec	easyJet
11 Dec - 24 Jan	Wizz Air UK
01 Dec - 31 Jan	easyJet
13 Dec - 24 Jan	Wizz Air UK
05 Dec - 18 Jan	TAP
15 Dec - 22 Jan	easyJet
29 Dec - 19 Jan	TAP
31 Dec - 21 Jan	Vueling Airlines
29 Dec - 17 Jan	TAP
29 Dec - 15 Jan	TAP
09 Dec - 13 Jan	Air Europa

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 978€

Return flights