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

Return flights

05 Mar - 11 Mar	Vueling Airlines
11 Mar - 26 Mar	Avianca
11 Mar - 20 Mar	Avianca
18 Mar - 31 Mar	Avianca
17 Mar - 24 Mar	Avianca
15 Mar - 20 Mar	Avianca
17 Mar - 31 Mar	Avianca
16 Mar - 24 Mar	Avianca
05 Mar - 16 Mar	TAP
04 Mar - 12 Mar	TAP
18 Mar - 14 Apr	Avianca
31 Mar - 13 Apr	Ryanair
30 Mar - 27 Apr	Ryanair
31 Mar - 14 Apr	Ryanair
29 Mar - 13 Apr	easyJet
31 Mar - 20 Apr	Ryanair
20 Mar - 14 Apr	Ryanair
21 Mar - 06 Apr	Lufthansa
19 Mar - 07 Apr	Ryanair
23 Mar - 18 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 790€

Return flights