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

Return flights

21 Aug - 22 Sep	Avianca
20 Aug - 21 Sep	Air France
15 Aug - 18 Aug	Air France
29 Aug - 14 Sep	Avianca
26 Aug - 10 Sep	SWISS
26 Aug - 09 Sep	SWISS
29 Aug - 27 Sep	Air France
15 Aug - 30 Sep	Air France
13 Aug - 18 Aug	Air France
23 Aug - 18 Sep	KLM
19 Aug - 06 Sep	Delta
28 Aug - 16 Sep	Delta
21 Aug - 29 Aug	Delta
22 Aug - 29 Aug	Delta
14 Aug - 18 Aug	Air France
15 Aug - 22 Aug	Air France
12 Aug - 17 Aug	KLM
21 Aug - 28 Aug	Avianca
27 Aug - 29 Aug	Delta
26 Aug - 27 Aug	Delta

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 $949

Return flights