Heathrow Airport closes Friday after fire causes power outage
London’s Heathrow Airport closed Friday after a fire at a nearby electrical substation caused a power outage, disrupting travel for tens of thousands of passengers planning to fly in or out of Europe’s busiest airport.
The first flight since the closure departed late Friday local time, and Heathrow posted on X that it hopes to run a “full operation” on Saturday.
More than 800 flights were canceled in and out of the airport on Friday, according to flight-tracking site FlightAware, as of the most recent update, upending travel at the major hub and connecting airport.
Airlines warned travelers that disruptions could continue into the weekend, and Heathrow posted that travelers shouldn’t go to the airport unless advised to do so by their airline.
FlightTracker data after a major electrical fire near Heather International closed the airport on March 21st, 2025
Source: FlightTracker24
London’s Metropolitan Police said that while there was “no indication of foul play,” the counterterrorism division would now lead the investigation into the fire.
“Given the location of the substation and the impact this incident has had on critical national infrastructure, the Met’s Counter Terrorism Command is now leading enquiries,” the force said in a post on X.
“This is due to the specialist resources and capabilities within that command that can assist in progressing this investigation at pace to minimise disruption and identify the cause,” it said.
“Heathrow is experiencing a significant power outage across the airport. … Whilst fire crews are responding to the incident, we do not have clarity on when power may be reliably restored,” a Heathrow spokesperson said earlier Friday.
Canceled and diverted flights
More than 120 flights were already in the air when the closure was announced and were diverted or returned to their originating airports, according to Flightradar24. Nearly three-quarters of the flights scheduled to depart from Heathrow, or 500 flights, and half of the arrivals destined for the airport, 300 flights, were also scrubbed.
Airlines around the world due to operate flights into and out of Heathrow told passengers to stay home.
The fire and airport closure left thousands of travelers stranded. British Airways was the most affected airline, with over half of its Friday schedule canceled.
The airline said it would offer “flexible options” for rebooking to passengers set to travel to or from Heathrow on Friday through the weekend, in an online post.
“Our teams are currently working hard to review our long-haul schedule as well as the implications for our schedule tomorrow and beyond,” it said in a statement.
As the fire appears to be outside of the airlines’ control, they may not be required to cover compensation, according to a note issued by Citi on Friday.
American Airlines, a British Airways partner across the Atlantic, said almost 20 flights from Thursday were diverted or canceled and that it provided overnight hotels for affected customers. It canceled another close to 20 in or out of London on Friday, she said. The carrier planned to operate its full schedule to and from London on Saturday.
European travel and leisure stocks fell on news of the airport closure.
‘Catastrophic’ fire
Workers investigate the electrical substation following a fire at an electrical substation supplying power to the facility, in London, United Kingdom on March 21, 2025. The UK’s Heathrow Airport announced early Friday that it has been forced to close following a fire at an electrical substation supplying power to the facility. (Photo by Rasid Necati Aslim/Anadolu via Getty Images)
Rasid Necati Aslim | Anadolu | Getty Images
Ed Miliband, U.K. energy minister, described the fire as “catastrophic,” according to Reuters, adding that the airport’s backup generator had been affected by the blaze.
Speaking to ITV’s “Good Morning Britain,” Miliband said the National Grid told him “it’s like a fire they’ve never, kind of, quite seen anything like the scale of what happened before,” according to a post by the program on X.
Miliband added that the National Grid was trying to use another backup system to restore power to the airport.
Power cuts also affected about 16,000 homes around the airport. As of 8 a.m. GMT, electrical supply was restored to all but around 4,900, according to the U.K. energy company Scottish and Southern Electricity Networks.
‘It makes Heathrow look quite vulnerable’
Heathrow Airport has an estimated 1,300 takeoffs and landings at the airport per day, according to its website.
Heathrow Airport set a new record last year by handling 83.9 million passengers, marking a nearly 6% increase from the previous year. In response to a recent fire at a substation supplying power to the airport, discussions have arisen regarding the resilience of Heathrow’s infrastructure. David Miliband emphasized the importance of understanding why the incident occurred and learning lessons to enhance infrastructure resilience.
The National Grid is currently assessing the level of resilience at the airport, especially after the fire impacted a backup generator. Willie Walsh, CEO of IATA, criticized Heathrow for being overly reliant on a single power source without a backup, calling it a “total planning failure.” He also raised concerns about the allocation of passenger care costs in the event of infrastructure failures.
Anita Mendiratta highlighted the wide-ranging implications of the airport closure, noting that Heathrow handles over 4,000 tons of cargo daily in addition to passenger traffic. With 1.4 million tonnes of cargo passing through the airport in 2023, the closure has significant implications for the transportation of goods.
Heathrow Airport officials are working to resume operations and advise travelers to stay updated through the airport’s website and social media platforms. The incident underscores the importance of infrastructure resilience and contingency planning to mitigate disruptions in the future.
