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

Return flights

10 Sep - 20 Oct	Wizz Air Malta
10 Sep - 26 Sep	Wizz Air Malta
11 Sep - 25 Sep	TAP
22 Sep - 20 Oct	TAP
01 Sep - 28 Sep	Norse Atlantic Airways (UK)
22 Sep - 19 Oct	TAP
02 Sep - 16 Sep	TAP
17 Sep - 27 Oct	Wizz Air Malta
08 Sep - 24 Sep	Norse Atlantic Airways (UK)
03 Sep - 16 Sep	TAP
13 Sep - 28 Sep	Norse Atlantic Airways (UK)
08 Sep - 29 Sep	Norse Atlantic Airways (UK)
22 Sep - 22 Oct	easyJet
01 Sep - 20 Sep	TAP
02 Sep - 21 Sep	Norse Atlantic Airways (UK)
23 Sep - 22 Oct	Vueling Airlines
21 Sep - 15 Oct	Wizz Air Malta
23 Sep - 07 Oct	Vueling Airlines
21 Sep - 22 Oct	Vueling Airlines
22 Sep - 07 Oct	easyJet

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 829€

Return flights