Cheap flights from London to Buenos Aires from $547

The cheapest month to fly to Buenos Aires from London is in April. Flight prices, which tend to average around $525, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of April, then book flights to Buenos Aires from London during September instead. Flights to Buenos Aires in September, while not as cheap as those in April, still average around $565.

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 $1,389 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 $1,116 on momondo.

You could potentially save up to 49% on your flight if you consider stops on a London to Buenos Aires flight.

As of May 2026, prices for London to Buenos Aires flights are approximately 4% cheaper 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: 68% of momondo users choosing 1-stop flights on this route connected there.

Flights via New York (JFK) offer the lowest average round-trip price of $1,176.

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 May 2026, there are 3 flights per day flying from London to Buenos Aires. The most common time of day flights depart is 9:00PM, with 100% of flights taking off in the evening.

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