London’s Heathrow Airport closed Friday after a hearth at a close-by electrical substation induced an influence outage, disrupting journey for tens of 1000’s of passengers planning to fly in or out of Europe’s busiest airport.
The primary flight because the closure departed late Friday native time, and Heathrow posted on X that it hopes to run a “full operation” on Saturday.
Greater than 800 flights had been canceled out and in of the airport on Friday, in response to flight-tracking website FlightAware, as of the newest replace, upending journey on the main hub and connecting airport.
Airways warned vacationers that disruptions may proceed into the weekend, and Heathrow posted that vacationers should not go to the airport except suggested to take action by their airline.
FlightTracker information after a significant electrical hearth close to Heather Worldwide closed the airport on March twenty first, 2025
Supply: FlightTracker24
London’s Metropolitan Police stated that whereas there was “no indication of foul play,” the counterterrorism division would now lead the investigation into the fireplace.
“Given the situation of the substation and the impression this incident has had on essential nationwide infrastructure, the Met’s Counter Terrorism Command is now main enquiries,” the drive stated in a post on X.
“That is because of the specialist sources and capabilities inside that command that may help in progressing this investigation at tempo to minimise disruption and establish the trigger,” it stated.
“Heathrow is experiencing a major energy outage throughout the airport. … While hearth crews are responding to the incident, we should not have readability on when energy could also be reliably restored,” a Heathrow spokesperson stated earlier Friday.
Canceled and diverted flights
Greater than 120 flights had been already within the air when the closure was introduced and had been diverted or returned to their originating airports, in response to Flightradar24. Almost three-quarters of the flights scheduled to depart from Heathrow, or 500 flights, and half of the arrivals destined for the airport, 300 flights, had been additionally scrubbed.
Airways around the globe attributable to function flights into and out of Heathrow told passengers to remain house.
The fireplace and airport closure left 1000’s of vacationers stranded. British Airways was probably the most affected airline, with over half of its Friday schedule canceled.
The airline stated it will supply “versatile choices” for rebooking to passengers set to journey to or from Heathrow on Friday by the weekend, in an online post.
“Our groups are at the moment working onerous to overview our long-haul schedule in addition to the implications for our schedule tomorrow and past,” it stated in an announcement.
As the fireplace seems to be exterior of the airways’ management, they might not be required to cowl compensation, in response to a notice issued by Citi on Friday.
American Airlines, a British Airways accomplice throughout the Atlantic, stated nearly 20 flights from Thursday had been diverted or canceled and that it offered in a single day inns for affected clients. It canceled one other shut to twenty in or out of London on Friday, she stated. The provider deliberate to function its full schedule to and from London on Saturday.
European journey and leisure shares fell on information of the airport closure.
‘Catastrophic’ hearth
Employees examine {the electrical} substation following a hearth at {an electrical} substation supplying energy to the ability, in London, United Kingdom on March 21, 2025. The UK’s Heathrow Airport introduced early Friday that it has been compelled to shut following a hearth at {an electrical} substation supplying energy to the ability. (Picture by Rasid Necati Aslim/Anadolu by way of Getty Photos)
Rasid Necati Aslim | Anadolu | Getty Photos
Ed Miliband, U.Ok. power minister, described the fireplace as “catastrophic,” in response to Reuters, including that the airport’s backup generator had been affected by the blaze.
Chatting with ITV’s “Good Morning Britain,” Miliband stated the Nationwide Grid advised him “it is like a hearth they’ve by no means, type of, fairly seen something like the size of what occurred earlier than,” in response to a put up by this system on X.
Miliband added that the Nationwide Grid was attempting to make use of one other backup system to revive energy to the airport.
Energy cuts additionally affected about 16,000 properties across the airport. As of 8 a.m. GMT, electrical provide was restored to all however round 4,900, in response to the U.Ok. power firm Scottish and Southern Electrical energy Networks.
‘It makes Heathrow look fairly weak’
Heathrow Airport has an estimated 1,300 takeoffs and landings on the airport per day, in response to its web site. It dealt with a file 83.9 million passengers final yr — an almost 6% improve from 2023.
Chatting with “Good Morning Britain,” Miliband stated on Friday, “We have to grasp why this occurred, and we have started working out what the teachings are for the resilience of our infrastructure.”
Firefighters douses flames of a hearth that broke out at a substation supplying energy to Heathrow Airport in Hayes, west London on March 21, 2025.
Benjamin Cremel | Afp | Getty Photos
He stated the Nationwide Grid is taking a look at whether or not there may be “enough resilience” in place on the airport, on condition that the fireplace additionally affected a backup generator.
“It makes Heathrow look fairly weak. And subsequently, we have to study classes … about not simply Heathrow, however how we defend our main infrastructure,” Miliband stated.
Willie Walsh, CEO of the Worldwide Air Transport Affiliation, or IATA, an airline trade group, criticized Heathrow Airport for being “completely depending on a single energy supply with out another,” in an online statement, describing it as a “whole planning failure” by the airport.
Walsh questioned who would cowl the prices of the ensuing journey disruptions.
“We should discover a fairer allocation of passenger care prices than airways alone selecting up the tab when infrastructure fails,” he stated. “Till that occurs, Heathrow has little or no incentive to enhance.”
‘Very vast’ implications
Anita Mendiratta, a journey and tourism advisor and founding father of consultancy AM&A, described the implications of the fireplace and closure of the airport as “very vast.”

“What we additionally have to take into consideration is over and above passenger visitors, over 4,000 tons of cargo undergo Heathrow each single day,” she advised CNBC’s “Squawk Box Europe.”
Greater than 1.4 million tonnes of cargo flew out and in of Heathrow in 2023, in response to a put up on the airport’s web site, with 90% of products transported within the maintain of passenger plane.
Airport officers stated they are going to replace vacationers “when extra info on the resumption of operations is offered.”
Vacationers can examine Heathrow Airport’s website or social media platforms, together with X, for the newest info.