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

Return flights

07 Mar - 16 Mar	Ryanair
11 Mar - 18 Mar	Ryanair
10 Mar - 17 Mar	Avianca
16 Mar - 20 Mar	Avianca
09 Mar - 17 Mar	Avianca
05 Mar - 12 Mar	Avianca
19 Mar - 23 Mar	Avianca
09 Mar - 22 Mar	Avianca
12 Mar - 31 Mar	Avianca
05 Mar - 15 Mar	Avianca
15 Mar - 16 Apr	Avianca
16 Mar - 16 Apr	Avianca
14 Mar - 16 Apr	Avianca
22 Mar - 19 Apr	Avianca
09 Mar - 01 Apr	Avianca
18 Mar - 07 Apr	Ryanair
22 Mar - 08 Apr	Avianca
19 Mar - 07 Apr	Avianca
23 Mar - 07 Apr	Avianca
07 Mar - 08 Apr	Avianca

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 844€

Return flights