Heathrow Airport has confirmed passengers will face major delays due to a "technical issue" discovered this morning.
Britain's largest airport has warned that the issue "may cause delays" with passengers due to check-in and boarding system issues.
An airport spokesman said: "A third-party supplier providing check-in and boarding systems for several airlines across multiple airports is experiencing a technical issue, which may cause delays for departing passengers. The provider is working to resolve the problem quickly.
"Please check your flight status with your airline before travelling to the airport. "Additional colleagues are available in check-in areas to assist and minimise disruption. We apologise for any inconvenience."
The airline added in a follow-up statement that Collins Aerospace is the check-in area "experiencing a technical issue".
EasyJet said they are "aware of an IT system" but are "currently operating as normal and do not expect this to impact our flying program for the remainder of the day".
Flight cancellations and large delays have also occurred at Brussels Airport after it was hit by a cyberattack on Friday night.
The airport has so far cancelled 10 flights, and 17 flights are experiencing delays of more than one hour.
Brussels Airport said: "It is still too early to say when the problem will be resolved."
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Passengers are experiencing severe delays at Heathrow Airport
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Brussels Airport is reporting delays and cancellations
| GETTYIn a statement, the airport said: "This has a large impact on the flight schedule and will, unfortunately, cause delays and cancellations of flights."
Collins Aerospace said: "We have become aware of a cyber-related disruption to our Muse software in select airports. We are actively working to resolve the issue and restore full functionality to our customers as quickly as possible.
"The impact is limited to electronic customer check-in and baggage drop, and can be mitigated with manual check-in operations. We will share more details as they are available."
Meanwhile, Berlin Airport revealed that it was working on a "quick solution" to the ongoing problem.
The airport said in a statement: "Due to a technical issue at a system provider operating across Europe, there are longer waiting times at check-in."
Heathrow Airport released its update this morning
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Berlin Airport has reportedly cut off connections to check-in systems, with passengers now expecting longer wait times at check-in and boarding.
Passengers with a flight scheduled today are advised to confirm with their operator before heading to the airport.
Heathrow Airport welcomed 83.9 million passengers in 2024 and linked the UK to over 230 destinations worldwide.
It handles over 450,000 flights every year.
Earlier this month, Terminal 4 of the airport was evacuated due to a "possible hazardous materials incident".
Heathrow is one of the airports affected (stock pic) | GETTYAround 20 people were injured, the Metropolitan Police said, but confirmed no "adverse substance was found".
The airport was closed due to a fire in March, with 1,351 flights cancelled.
The fire impacted around 145,000 passengers, which brought further disruptions days after.
More than 16,300 homes also faced blackouts due to the fire raging from the electrical substation in Hayes.