Cheap flights from London to Buenos Aires from $615

The cheapest month to fly to Buenos Aires from London is in September. Flight prices, which tend to average around $1,173, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of September, then book flights to Buenos Aires from London during May instead. Flights to Buenos Aires in May, while not as cheap as those in September, still average around $1,189.

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 $1,399 when searching weeks out. 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 $1,179 on momondo.

There is only 1 cabin class 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 34% on your flight if you consider stops on a London to Buenos Aires flight.

As of March 2026, prices for London to Buenos Aires flights are approximately 17% more expensive when compared to flights at the same time last year.

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 in the evening have, in the past, seen delays more frequently in comparison.

Madrid (MAD) was the most common stop: 66% of momondo users choosing 1-stop flights on this route connected there.

Flights via Frankfurt am Main (FRA) offer the lowest average round-trip price of $1,327.

Flights connecting via Frankfurt am Main (FRA) have the shortest average one-way travel time: 16h 25m.

Frankfurt am Main (FRA) has the shortest average layover time for this route: 1h 05m.

As of March 2026, there are 3 flights per day flying from London to Buenos Aires. The most common time of day flights depart is 10:00PM, with 100% of flights taking off in the evening.

21 flights are operational weekly from London to Buenos Aires as of March 2026. The most popular departure day for this route is Mon, with 14% of flights per week taking off on this day.