Cheap flights from London to Buenos Aires from €563

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 €1,020. If you aren’t able to travel to Buenos Aires during the month of September, then flying in May is also cheap. Prices for this month can be found on momondo for an average of €1,032.

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 €1,213 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 €1,024 on momondo.

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.

Houston (IAH) was the most common stop: 33% of momondo users choosing one-stop flights on this route connected there.

Flights via Houston (IAH) offer the lowest average return price of €911.

Flights connecting via Madrid (MAD) have the shortest average one-way travel time: 16h 35m.

Madrid (MAD) has the shortest average stopover time for this route: 1h 25m.

The number of flights available between London and Buenos Aires is 3 per day as of March 2026. The most frequent departure time is 22:00, with 100% of daily flights leaving 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.