Cheap flights from London to Buenos Aires from £448

In general, September is the cheapest month to fly from London to Buenos Aires. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £874. If you don’t want to visit Buenos Aires in September, then you should wait until May to fly from London, when ticket prices are also cheap, with an average price of £886.

The cheapest day to depart on your flight to Buenos Aires is on a Monday when prices can be found for as low as £993. 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 because it is more convenient for both business and leisure travellers. As a result, prices tend to be around £1,139.

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

You are more likely to see cheaper flights to Buenos Aires from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Buenos Aires for around £1,043 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 for as low as £879 on momondo.

There are 2 cabin classes available to choose from on London to Buenos Aires flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 44% on your flight if you consider stops on a London to Buenos Aires flight.

United Airlines, KLM, and Lufthansa are the most popular carriers operating from London to Buenos Aires

British Airways, Lufthansa and Avianca are the top three most popular airlines that fly to Buenos Aires from London according to our data. British Airways is the first choice among our users, with 32% of people opting to fly with this airline when travelling to Buenos Aires. Keep in mind that there are 9 different airlines that fly to Buenos Aires on a routine basis, so you have a few additional options to choose from.

Historically, on average around 0% of flights between London and Buenos Aires have experienced a delay on any given week. The average delay length over the past 12 months has been 0 minutes.

Generally, flights departing in the evening tend to experience fewer delays. Flights departing in the evening have, in the past, seen delays more frequently in comparison.

Madrid (MAD) was the most common stop: 38% of momondo users choosing one-stop flights on this route connected there.

Flights via Bogotá (BOG) offer the lowest average return price of £781.

Flights connecting via Amsterdam (AMS) have the shortest average one-way travel time: 16h 26m.

Rio de Janeiro (GIG) has the shortest average stopover time for this route: 1h 37m.

As of March 2026, 3 flights take off from London and land in Buenos Aires each day. The most common flight departure time for this route is 22:00, with 100% of daily flights taking off in the evening.

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