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

Return flights

02 Sep - 15 Oct	SWISS
01 Sep - 29 Sep	KLM
13 Sep - 31 Oct	ITA Airways
01 Sep - 31 Oct	ITA Airways
02 Sep - 29 Sep	KLM
04 Sep - 28 Sep	KLM
10 Sep - 24 Sep	ITA Airways
02 Sep - 14 Sep	Delta
04 Sep - 14 Sep	Delta
16 Sep - 29 Sep	KLM
15 Sep - 31 Oct	ITA Airways
09 Sep - 31 Oct	ITA Airways
11 Sep - 31 Oct	ITA Airways
16 Sep - 31 Oct	ITA Airways
14 Sep - 31 Oct	ITA Airways
12 Sep - 31 Oct	ITA Airways
03 Sep - 30 Sep	KLM
13 Sep - 29 Sep	ITA Airways
16 Sep - 08 Oct	SWISS
22 Sep - 29 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.

Book a cheap hotel in Buenos Aires

Cheap car rent in Buenos Aires

Cheapest return flights from London to Buenos Aires in September from 986€

Return flights