Cheap flights from London Heathrow Airport to Buenos Aires from $619

The cheapest month to fly to Buenos Aires from London Heathrow Airport is in September. Flight prices, which tend to average around $1,222, 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 Heathrow Airport during November instead. Flights to Buenos Aires in November, while not as cheap as those in September, still average around $1,240.

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 $1,407 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 Heathrow Airport for as low as $1,179 on momondo.

There is only 1 cabin class available to choose from on London Heathrow 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 40% on your flight if you consider stops on a London Heathrow Airport to Buenos Aires flight.

As of February 2026, prices for London Heathrow Airport to Buenos Aires flights are approximately 44% more expensive when compared to flights at the same time last year.

3 flights are operational daily from London Heathrow Airport to Buenos Aires as of February 2026. The most popular departure time for this route is 10:00PM, with 100% of flights per day taking off in the evening.

As of February 2026, there are 21 flights per week flying from London Heathrow Airport to Buenos Aires. The most common day of the week flights depart is Mon, with 14% of flights taking off on this day.