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

Return flights

22 Sep - 05 Oct	Delta
29 Sep - 13 Oct	ITA Airways
22 Sep - 29 Sep	KLM
30 Sep - 28 Oct	ITA Airways
30 Sep - 23 Oct	ITA Airways
24 Sep - 15 Oct	ITA Airways
20 Sep - 04 Oct	Delta
25 Sep - 11 Oct	Delta
30 Sep - 07 Oct	ITA Airways
29 Sep - 06 Oct	ITA Airways
29 Sep - 25 Oct	Delta
24 Sep - 30 Sep	ITA Airways
26 Sep - 30 Sep	ITA Airways
18 Sep - 23 Sep	Lufthansa
19 Sep - 22 Sep	Lufthansa
23 Sep - 29 Sep	ITA Airways
23 Sep - 30 Sep	ITA Airways
18 Sep - 21 Sep	Lufthansa
25 Sep - 30 Sep	ITA Airways
25 Sep - 28 Sep	ITA Airways

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

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 September from $1399

Return flights