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

Return flights

22 Sep - 20 Oct	easyJet
30 Sep - 21 Oct	easyJet
21 Sep - 15 Oct	easyJet
22 Sep - 25 Sep	easyJet
26 Sep - 29 Sep	Ryanair
27 Sep - 04 Oct	easyJet
25 Sep - 02 Oct	easyJet
29 Sep - 13 Oct	easyJet
25 Sep - 09 Oct	easyJet
24 Sep - 01 Oct	easyJet
26 Sep - 10 Oct	easyJet
22 Sep - 01 Oct	easyJet
25 Sep - 30 Sep	easyJet
23 Sep - 28 Sep	easyJet
21 Sep - 30 Sep	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 1138€

Return flights