Cheap flights from London Heathrow Airport to Buenos Aires from £399

In general, March is the cheapest month to fly from London Heathrow Airport to Buenos Aires. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £169. If you don’t want to visit Buenos Aires in March, then you should wait until April to fly from London Heathrow Airport, when ticket prices are also cheap, with an average price of £385.

The cheapest day to depart on your flight to Buenos Aires is on a Monday when prices can be found for as low as £1,002. This is often the case because there is less demand to fly during this day of the week. On the other hand, Saturday is the most expensive day to depart from London Heathrow Airport because it is more convenient for both business and leisure travellers. As a result, prices tend to be around £1,268.

Fly from London Heathrow to Buenos Aires Ministro Pistarini for the best London Heathrow - Buenos Aires flight prices

You are more likely to see cheaper flights to Buenos Aires from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Buenos Aires for around £1,019 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Buenos Aires from London Heathrow Airport for as low as £819 on momondo.

You could potentially save up to 47% on your flight if you consider stops on a London Heathrow Airport to Buenos Aires flight.

Avianca, United Airlines, and LATAM Airlines are the most popular carriers operating from London Heathrow to Buenos Aires

British Airways, Avianca and Lufthansa are the top three most popular airlines that fly to Buenos Aires from London Heathrow Airport according to our data. British Airways is the first choice among our users, with 31% of people opting to fly with this airline when travelling to Buenos Aires. Keep in mind that there are 8 different airlines that fly to Buenos Aires on a routine basis, so you have a few additional options to choose from.

Madrid (MAD) was the most common stop: 24% of momondo users choosing one-stop flights on this route connected there.

Flights via Bogotá (BOG) offer the lowest average return price of £745.

Flights connecting via Sao Paulo (GRU) have the shortest average one-way travel time: 16h 53m.

Frankfurt am Main (FRA) has the shortest average stopover time for this route: 1h 36m.

The number of flights available between London Heathrow Airport and Buenos Aires is 3 per day as of May 2026. The most frequent departure time is 21:00, with 100% of daily flights leaving in the evening.

The number of flights available between London Heathrow Airport and Buenos Aires is 21 per week as of May 2026. The most frequent departure day is Mon, with 14% of weekly flights leaving on this day.