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

Return flights

11 Mar - 15 Mar	Avianca
12 Mar - 16 Mar	Avianca
10 Mar - 15 Mar	Avianca
18 Mar - 25 Mar	Avianca
11 Mar - 18 Mar	Avianca
11 Mar - 16 Mar	Avianca
11 Mar - 25 Mar	Avianca
23 Mar - 28 Apr	Avianca
15 Mar - 31 Mar	Avianca
12 Mar - 23 Mar	Avianca
17 Mar - 31 Mar	Avianca
22 Mar - 12 Apr	Avianca
05 Mar - 01 Apr	Avianca
23 Mar - 13 Apr	Avianca
01 Mar - 29 Apr	Avianca
25 Mar - 23 Apr	Air Europa
20 Mar - 06 Apr	Air Europa
12 Mar - 08 Apr	Avianca
18 Mar - 08 Apr	Avianca
07 Mar - 04 Apr	Ryanair

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 773€

Return flights