AirHint found the following cheapest return flights from London (LHR) to Buenos Aires (EZE) in September 2026 (see full year).

Return flights

13 Sep - 20 Sep	Avianca
17 Sep - 21 Sep	Avianca
14 Sep - 24 Sep	Avianca
06 Sep - 21 Sep	Avianca
10 Sep - 24 Sep	Avianca
10 Sep - 01 Oct	Avianca
10 Sep - 20 Sep	Avianca
09 Sep - 21 Sep	Avianca
15 Sep - 29 Sep	Avianca
20 Sep - 30 Sep	Avianca
06 Sep - 27 Sep	Avianca
29 Sep - 06 Oct	Avianca
01 Sep - 01 Oct	Avianca
03 Sep - 03 Oct	Avianca
18 Sep - 09 Oct	Turkish Airlines
21 Sep - 31 Oct	United
23 Sep - 04 Oct	Turkish Airlines
23 Sep - 03 Oct	Turkish Airlines
18 Sep - 02 Oct	Avianca
30 Sep - 14 Oct	Avianca

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 843€

Return flights