A power outage shut down Heathrow — all of Heathrow — creating chaos for hundreds of thousands of travelers

• Heathrow Airport will be closed all day Friday after a nearby fire caused a power outage.
• Heathrow is advising passengers not to travel to the airport and to contact their airlines.
• More than 1,300 flights are expected to be affected.

London’s Heathrow Airport, one of the world’s busiest, was closed on Friday after a large fire broke out nearby.

Flightradar24, a live flight-tracking platform, told Business Insider that at least 1,351 flights would be affected.

“Due to a fire at an electrical substation supplying the airport, Heathrow is experiencing a significant power outage,” the airport posted to X early Friday morning local time, saying it would be closed until just before midnight.

It advised passengers not to travel to the airport, and to contact their airline for more information.

On Friday morning, barricades and signs were placed around the airport to prevent drivers from entering its perimeter.

The canceled flights had a capacity of 291,000, according to data provided to BI by aviation analytics firm Cirium. It said the airport was scheduled to see 665 departures on Friday, equating to over 145,094 seats, and 669 flight arrivals, equating to 145,836 seats.

The airport says it welcomes over 200,000 passengers a day.

Terminal Five is the busiest terminal, but on Friday morning, a BI reporter found that the area around it was eerily quiet.

Dozens of people were waiting outside, mostly checking their phones for travel updates.

Rhythem Chauhan was one of them. She had been there since 5 a.m., awaiting news of her flight home to Delhi.

“It’s heartbreaking,” she told BI, saying she hadn’t been back to India in five years.

Luke Metcalf told BI he was supposed to fly to Thailand this morning but his flight was diverted to another London airport, Gatwick, and would take off at 5 p.m. instead.

“It is what is, I’m a bit disappointed but there’s not much you can do about it,” he said.

Another stranded passenger, Andrew Palmer, was supposed to fly to San Francisco but decided to stay at a hotel near the airport after seeing the news on TV.

“I’m disappointed, very disappointed,” he told BI. “The disheartening thing was that I had an internal flight to Las Vegas as well.”

Heathrow was the fourth busiest airport in the world in 2024, according to OAG, a travel data company, behind only Tokyo Haneda Airport, Dubai International Airport, and Hartsfield-Jackson Atlanta International Airport.

Last year, about 83.9 million people flew through Heathrow, up 6% from the previous year.

The airport’s closure led to multiple flight diversions, with some British Airways flights rerouting to London Gatwick, while other airlines diverted to more distant locations, according to Cirium.

A spokesperson for British Airways, one of the airport’s main airlines, said in a statement to BI that this would “have a significant impact on our operation and our customers.”

In a later statement, the BA spokesperson said, “Our teams are currently working hard to review our long-haul schedule as well as the implications for our schedule for tomorrow and beyond,”

The airline said it was redirecting flights already on their way to Heathrow to other UK airports.

A spokesperson for Virgin Atlantic, whose main UK hub is Heathrow, told BI that the closure was having a “significant impact” on its flight operations to and from the airport. They also advised customers not to travel to Heathrow.

“We’re incredibly sorry for the disruption this will cause and are working with our teams to ensure customers can complete their journeys as quickly as possible,” the spokesperson said.

Qatar Airways, in an X post, said that the closure had affected five flights from London to Doha and four flights from Doha to London.

“Passengers impacted due to above will be taken care of by our customer care and airport teams,” it added.

The fire occurred at an electricity substation in Hayes in West London, about 1.5 miles from the airport. The cause of the fire is not yet known.

The London Fire Brigade said in a post on X that 10 fire engines and about 70 firefighters were called to the scene. Images showed large flames and plumes of thick black smoke.

“This will be a prolonged incident, with crews remaining on scene throughout the night,” it said on its website.

In a press briefing late Friday morning, the fire brigade said the fire was not fully extinguished but was under control, and that 5,000 homes were still without power.

Sadiq Khan, the mayor of London, said in a statement that electricity suppliers were working hard to restore power.

London has several other international airports including Gatwick, the city’s second-busiest airport, and Stansted, known for budget flights and flights to Europe.

Do you have a story to share about how your plans are affected by Heathrow’s shutdown? Contact reporter Pete Syme at psyme@businessinsider.com.