AirHint found the following cheapest return flights from London (LON) to Buenos Aires (AEP) in April 2026 (see full year).

Return flights

07 Apr - 17 Apr	Avianca
08 Apr - 15 Apr	Avianca
06 Apr - 16 Apr	Avianca
23 Apr - 11 May	Avianca
30 Apr - 11 May	Avianca
12 Apr - 21 Apr	Avianca
29 Apr - 17 May	Avianca
01 Apr - 19 Apr	LATAM Airlines Group
01 Apr - 30 Apr	LATAM Airlines Group
04 Apr - 18 Apr	LATAM Airlines Group
01 Apr - 08 Apr	LATAM Airlines Group
01 Apr - 12 Apr	LATAM Airlines Group
03 Apr - 10 Apr	LATAM Airlines Group

Also check the deals for one-way flights from London to Buenos Aires in April.

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 April from 903€

Return flights