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

Return flights

31 Aug - 25 Sep	LATAM Airlines Group
11 Aug - 18 Aug	TAP
31 Aug - 28 Sep	British Airways
14 Aug - 19 Aug	LATAM Airlines Group
14 Aug - 21 Aug	LATAM Airlines Group
19 Aug - 26 Aug	Avianca
26 Aug - 02 Sep	Avianca
13 Aug - 21 Aug	LATAM Airlines Group
13 Aug - 18 Aug	LATAM Airlines Group
15 Aug - 18 Aug	British Airways
29 Aug - 13 Sep	LATAM Airlines Group
30 Aug - 13 Sep	LATAM Airlines Group
11 Aug - 19 Aug	LATAM Airlines Group
21 Aug - 02 Sep	Avianca
10 Aug - 17 Aug	LATAM Airlines Group
12 Aug - 18 Aug	LATAM Airlines Group
17 Aug - 04 Sep	LATAM Airlines Group
26 Aug - 23 Sep	Air Canada
26 Aug - 01 Sep	LATAM Airlines Group
28 Aug - 03 Sep	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 $1233

Return flights