London Flight Disruption Continues at Heathrow and Gatwick

Source-checked update: This article brings together information checked against primary sources and independent reporting available at publication time. Full source links are listed at the end of the article.

A technical failure in NATS’s flight-planning system continues to affect air travel in and around London. The failure on September 8 caused widespread delays and hundreds of cancellations across UK airports, with residual disruption still affecting Heathrow and Gatwick. Travelers should check their individual flight status before setting out, as the situation is uneven rather than a complete shutdown of either airport.

What Happened

The disruption began on September 8, 2026, when a technical issue affected the NATS flight-planning system used in UK aviation operations. The UK Civil Aviation Authority said the failure caused delays and hundreds of cancellations, with knock-on disruption continuing afterward.

Heathrow and Gatwick were among the airports affected. Independent reporting documented cancellations and delays continuing into September 9, as airlines worked to recover from the initial interruption.

Heathrow said on September 9 that flights were operating, but warned that disruption could continue as airlines repositioned aircraft and crew. This means that an airport may be open and operating while individual flights remain vulnerable to delays, changes or cancellation.

Gatwick’s official live flight information showed multiple cancellations on September 10. The latest verified information therefore points to continuing, individual disruption at both London airports, although the intensity has diminished from the initial event.

What This Means for Travelers

The disruption does not mean that all London flights are canceled or that Heathrow and Gatwick have closed. Some services are operating, but the wider recovery process can still affect individual departures and arrivals.

The main risk is knock-on disruption. Aircraft and crew may be out of position after earlier cancellations and delays, which can affect later services even if those flights were not directly involved in the original NATS failure. Travelers with connecting flights may also face difficulties if one part of their itinerary changes.

Conditions may differ by airport, airline, route and departure time. A flight shown as scheduled is not necessarily immune from later changes, while a cancellation affecting another service does not automatically apply to every flight on the same route or from the same airport.

Passengers traveling through Gatwick should pay particular attention to the airport’s live flight information, where cancellations were still displayed on September 10. Heathrow passengers should also monitor updates, as the airport has confirmed that flights are operating while warning of continuing knock-on effects.

What Travelers Should Do Now

Check the status of your flight directly with the airline and the relevant airport before leaving for Heathrow or Gatwick. Use the most recent information available, particularly if you are traveling soon, because the operational picture may change as airlines adjust aircraft and crew arrangements.

Do not assume that a general report of disruption means your own flight has been canceled. At the same time, do not rely only on an earlier confirmation if your departure is later in the day or if you are making a connection. Recheck close to travel time and keep an eye out for messages from your airline.

If your flight is delayed or canceled, follow the airline’s instructions about rebooking and next steps. Contact the airline directly for the latest information about your reservation rather than traveling to the airport without confirmation of what is happening.

Allow additional time for the journey and be prepared for changes to departure arrangements. If you are connecting through London, check each flight segment separately and confirm that a change to one service has not affected the rest of your itinerary.

Travelers who are collecting passengers or arranging onward transport should also confirm the revised arrival time before making the journey. With disruption continuing at an individual-flight level, arrival times may not match the original schedule.

What Is Confirmed

• A September 8 technical failure affected NATS’s flight-planning system.
• The failure caused delays and hundreds of cancellations across UK airports.
• Heathrow and Gatwick were among the airports affected.
• Heathrow said flights were operating on September 9 but warned of continuing knock-on disruption as airlines repositioned aircraft and crew.
• Gatwick’s official live flight information showed multiple cancellations on September 10.
• The verified situation is ongoing residual disruption, not a complete shutdown of Heathrow or Gatwick.

Sources

Primary sources

• CAA statement on passenger compensation following NATS disruption on 8 September
• NATS air traffic control technical issue – 9th September
• Flight Info

Independent reporting

• Airlines scramble to dig out from UK air traffic control tech problems that canceled 2,000 flights
• Nats boss summoned by UK transport secretary as flight chaos enters second day

Editorial note

This Travel News article was prepared by the VibrantGateways Team using publicly available information and primary sources where available. AI-assisted tools may be used during research and drafting, with publication subject to our editorial verification process.

Travel information can change quickly. Schedules, routes, prices, entry requirements, availability and other time-sensitive details should be confirmed with the relevant official provider or authority before making travel decisions.

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