London's Heathrow airport, one of the world's busiest international hubs, will remain closed at least until midnight on 21 March 2025 due to a serious fire that broke out on the evening of 20 March at an electrical substation supplying power to the facility. The incident has also halted cargo operations, impacting global supply chains and resulting in estimated economic losses of hundreds of millions of pounds.
The fire started in a transformer at the North Hyde electrical substation, located about 1.5 miles (around 2.4 kilometres) north of the airport in Hayes, West London. The London Fire Brigade responded at 23:23, deploying ten fire engines and about seventy firefighters to tackle the blaze. Authorities reported that the flames were brought under control at 06:28 on Friday. The cause of the fire remains under investigation.
The airport closure has completely halted cargo operations at a facility that handles approximately 1.6 million tonnes of goods each year. This disruption particularly affects industries reliant on just-in-time deliveries, such as pharmaceuticals, perishable goods, and high-value products. The situation is further complicated by the fact that Heathrow was already facing congestion and cargo delays before the incident, with freight volumes having increased by 10.5% compared to the previous year.
The fire has resulted in the cancellation or diversion of over 1,350 flights, including cargo operations. According to flight tracking service FlightRadar24, 679 scheduled arrivals and 678 departures were affected, with 120 flights already airborne when the closure was announced. Airlines have implemented emergency measures, with British Airways and Virgin Atlantic diverting their flights to Gatwick airport, which confirmed it is operating normally. Other international airlines have also been forced to change their routes, including Qantas, which diverted its Perth-London flight to Paris, and United Airlines, whose New York flight landed at Shannon in Ireland.
The economic impact of this shutdown on the aviation industry is estimated at hundreds of millions of pounds. Shukor Yusof, founder of Endau Analytics in Singapore, an aviation consultancy, told CNN that the incident "will undoubtedly cause disruption over the weekend and into next week, as airlines work through a backlog of flights unable to land, alongside the various complications stemming from the closure". Experts anticipate that the disruption caused by Heathrow’s closure may last several days or even weeks.
Heathrow's cargo city plays a crucial role in Britain's imports and exports, particularly for high-value goods. Indeed, the airport manages 52% of pharmaceutical exports, 48% of scientific instruments, and 38% of machinery exports from the UK. While there are other airports in the country handling cargo flights—such as Stansted, East Midlands (the largest cargo hub outside London, moving approximately 400,000 tonnes per year), Manchester, and Birmingham—none can replace Heathrow, particularly for belly cargo on long-haul flights.
