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

Return flights

31 Aug - 26 Sep	Avianca
24 Aug - 25 Sep	Avianca
28 Aug - 25 Sep	Avianca
28 Aug - 24 Sep	Avianca
30 Aug - 28 Sep	Air France
30 Aug - 27 Sep	Air France
25 Aug - 08 Sep	TAP
19 Aug - 01 Sep	TAP
29 Aug - 28 Sep	Air France
29 Aug - 26 Sep	TAP
12 Aug - 17 Aug	Wizz Air
11 Aug - 17 Aug	Ryanair
20 Aug - 29 Aug	Norse Atlantic Airways (UK)
11 Aug - 19 Aug	Ryanair
19 Aug - 29 Aug	Vueling Airlines
15 Aug - 18 Aug	TAP
22 Aug - 29 Aug	Ryanair
14 Aug - 25 Aug	Wizz Air UK
11 Aug - 15 Aug	Ryanair
16 Aug - 23 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 889€

Return flights