UK flights disrupted as NATS glitch hits Heathrow and Gatwick

Thousands of passengers are facing delays and cancellations after a fresh technical issue at UK air traffic control provider NATS disrupted departures from Heathrow, Gatwick and several other major airports on Tuesday.

New NATS technical fault halts departures at key UK hubs

Publicly available information indicates that a glitch in NATS’ flight processing system prompted restrictions on departing flights from early afternoon, affecting services in much of England and Wales. The disruption has been concentrated at London’s two largest airports, Heathrow and Gatwick, but reports suggest knock-on effects at other UK airports that rely on the same control centre in Swanwick, Hampshire.

NATS stated that the problem lies within its flight processing or flight planning systems, which handle the flow of aircraft into UK airspace. When these systems are not working normally, controllers reduce the rate at which flights are allowed to depart and transit, sharply cutting capacity and leading to queues on the ground and rerouting in the air.

According to live aviation tracking data cited in multiple news reports, hundreds of flights are experiencing delays, with cancellations building through the afternoon as airlines adjust schedules. Passengers travelling to and from key European cities, as well as long-haul destinations, are among those affected.

While NATS has indicated that the underlying fault has been identified, recovery of the system and the flight schedule is expected to be gradual. Industry coverage notes that even a short outage in the flight processing system can take hours to unwind because aircraft and crews end up in the wrong places, creating further disruption later in the day.

Heathrow, Gatwick and regional airports report widespread disruption

Heathrow, the UK’s busiest airport, has warned travellers that departures are being disrupted by the NATS issue and that some services may be delayed or cancelled. Public statements from the airport urge passengers to check the status of their flights with airlines before travelling and to allow extra time at terminals as queues build.

At Gatwick, reports describe outbound flights being held at gates or on taxiways as air traffic control limits the flow of departures. Social media posts from the airport and airlines show screens filled with delayed services to European holiday destinations and domestic routes, reflecting the heavy late-summer travel period.

Other airports in southern England, including Birmingham, London Stansted and London City, have also reported disruption to departures. Coverage from national outlets indicates that the majority of affected flights are those departing within NATS-controlled airspace in England and Wales, though some services to and from Scotland and Ireland are also experiencing secondary delays.

Airlines operating at the affected airports, including major UK and European carriers, are using online channels to advise passengers of rebooking options and to highlight that customer service centres and airport desks are under heavy pressure. Travellers are being encouraged to use airline apps or websites where possible to obtain updates and manage changes.

Passengers face long waits as knock-on delays build

Scenes shared from Heathrow and Gatwick show busy departure halls, long lines at airline service counters and passengers sitting on the floor near information screens as they wait for updates. Travel monitoring services report that substantial numbers of flights are operating with extended delays of more than an hour, while a growing minority are being cancelled outright as airlines attempt to stabilise operations.

Analysts note that major London hubs operate close to capacity, meaning there is limited slack in the system when a bottleneck develops in air traffic control. When the flow of departures is reduced, aircraft quickly begin to stack up, and even after restrictions are lifted, it can take much of the day for schedules to return to something approaching normal.

Passengers on affected flights are generally entitled under UK and EU air passenger protection rules to care and assistance, such as refreshments and accommodation, when they face significant delays or overnight disruption. However, regulators have previously described technical failures at air traffic control as extraordinary circumstances, which can limit eligibility for cash compensation, depending on the exact situation and how individual airlines respond.

Consumer guidance from the UK Civil Aviation Authority highlights that travellers whose flights are cancelled should be offered a choice between a refund and rerouting at the earliest opportunity, which may include flights with alternative airlines if seats are available. For those already abroad, this can mean an unplanned extra night or more at their destination while they wait for a replacement service.

Fresh spotlight on resilience after 2023 NATS failure

The latest disruption is drawing renewed attention to the resilience of the UK’s air traffic management systems. In August 2023, a separate technical failure in the NATS flight planning system on a busy bank holiday caused hundreds of cancellations and delays across the UK and Europe, affecting an estimated hundreds of thousands of passengers.

An independent review commissioned by the UK Civil Aviation Authority into the 2023 event found that a single corrupted flight plan had triggered a shutdown of automated processing, forcing controllers to manage flight plans manually. That incident led to a series of recommendations on system redundancy, incident response and communication with airlines and passengers.

While early reports suggest that today’s outage has different technical characteristics, the recurrence of significant disruption linked to the flight processing system is likely to prompt further questions from policymakers and industry groups. There is particular interest in how quickly contingency measures can be activated and how effectively information is shared with travellers during such events.

Consumer research published after the 2023 failure highlighted widespread passenger frustration over limited real-time information and confusion about rights to assistance. Observers are watching closely to see whether communication practices have improved this time, especially at large hubs where tens of thousands of people can be affected in a single afternoon.

What travellers should do if their UK flight is affected

Travel experts advising through media outlets recommend that passengers with flights scheduled from UK airports today check their airline’s app or website before leaving for the airport, even if their flight is still listed as operating. Services that appear on time can quickly move to delayed status as air traffic control restrictions change.

For those already at the airport, the most reliable source of information remains the airline operating the flight. Airport departure boards may lag behind real-time updates, and gate changes or aircraft swaps can add to the confusion. Travellers are also encouraged to keep boarding passes, receipts for food and accommodation, and any written communication from airlines, which may be important for later claims.

Industry analysts caution that once the immediate technical problem is resolved, disruption can continue into the evening and potentially into the following day, as aircraft and crew are repositioned. Passengers on early-morning services tomorrow may therefore also experience schedule changes linked to today’s outage.

Those with connecting flights, particularly long-haul itineraries, are advised to pay close attention to minimum connection times and be prepared for missed connections if their first leg is subject to an extended delay. Where possible, contacting the airline via digital channels before arriving at the hub airport can sometimes secure rebooking on alternative routes with less waiting time.

Standard: Flights departing UK disrupted by air traffic control technical issue

Guardian: Air traffic control issue causes flight delays and disruption across UK

Standard: Flight delay recovery caused by technical issue will take some time

AP: Travel chaos at UK airports as over 600 flights canceled