Cheap flights from London to Buenos Aires from $641

The cheapest month to fly to Buenos Aires from London is in May. Flight prices, which tend to average around $1,166, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of May, then book flights to Buenos Aires from London during September instead. Flights to Buenos Aires in September, while not as cheap as those in May, still average around $1,198.

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 $1,380 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 $1,075 on momondo.

You could potentially save up to 19% on your flight if you consider stops on a London to Buenos Aires flight.

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

Paris (CDG) was the most common stop: 29% of momondo users choosing 1-stop flights on this route connected there.

Flights via Bogotá (BOG) offer the lowest average round-trip price of $1,088.

Flights connecting via Paris (CDG) have the shortest average one-way travel time: 16h 05m.

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

As of August 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 August 2026. The most popular departure day for this route is Mon, with 14% of flights per week taking off on this day.