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

Return flights

23 Apr - 27 Apr	Air Europa
07 Apr - 21 Apr	Air Europa
09 Apr - 21 Apr	Air Europa
15 Apr - 27 Apr	Air Europa
13 Apr - 27 Apr	Air Europa
16 Apr - 24 Apr	Air Europa
13 Apr - 28 Apr	Air Europa
29 Apr - 06 May	Air Europa
21 Apr - 28 Apr	Avianca
29 Apr - 13 May	Avianca
22 Apr - 27 May	Avianca
19 Apr - 03 May	Avianca
17 Apr - 20 Apr	Air Europa
15 Apr - 21 Apr	Air Europa
19 Apr - 21 May	Avianca
21 Apr - 06 May	Ryanair
23 Apr - 07 May	Ryanair
30 Apr - 08 May	Ryanair
09 Apr - 06 May	Wizz Air UK
30 Apr - 13 May	Ryanair

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

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 April from 855€

Return flights