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

Return flights

11 Mar - 25 Mar	Avianca
19 Mar - 24 Mar	Avianca
17 Mar - 23 Mar	Avianca
09 Mar - 23 Mar	Avianca
09 Mar - 12 Mar	Avianca
11 Mar - 16 Mar	Avianca
12 Mar - 23 Mar	Avianca
11 Mar - 18 Mar	Avianca
11 Mar - 17 Mar	Avianca
09 Mar - 15 Mar	Avianca
24 Mar - 09 Apr	Avianca
22 Mar - 28 Apr	Avianca
04 Mar - 16 Apr	Avianca
23 Mar - 13 Apr	Avianca
18 Mar - 15 Apr	Avianca
30 Mar - 10 Apr	Avianca
24 Mar - 10 Apr	Avianca
31 Mar - 28 Apr	Avianca
30 Mar - 18 Apr	Avianca
04 Mar - 08 Apr	LATAM Airlines Group

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

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 March from 851€

Return flights