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

Return flights

30 Aug - 22 Sep	Avianca
31 Aug - 07 Sep	Avianca
28 Aug - 07 Sep	Avianca
28 Aug - 10 Sep	Avianca
26 Aug - 09 Sep	Avianca
26 Aug - 17 Sep	Avianca
25 Aug - 09 Sep	Avianca
27 Aug - 09 Sep	Avianca
28 Aug - 09 Sep	Avianca
28 Aug - 08 Sep	Avianca
13 Aug - 19 Aug	LATAM Airlines Group
14 Aug - 19 Aug	LATAM Airlines Group
21 Aug - 28 Aug	Air Canada
14 Aug - 21 Aug	LATAM Airlines Group
22 Aug - 28 Aug	Air France
24 Aug - 26 Aug	TAP
15 Aug - 20 Aug	LATAM Airlines Group
22 Aug - 26 Aug	KLM
20 Aug - 27 Aug	British Airways
21 Aug - 27 Aug	LATAM Airlines Group

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

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 August from 884€

Return flights