A UK court has ruled that the government's approval of London Gatwick Airport's expansion programme is lawful, Reuters reported. The judgment dismisses a legal challenge to the development consent underpinning the airport's plan to bring its standby northern runway into routine operational use.

The ruling preserves the planning consent that the Secretary of State granted for the project and removes a significant legal obstacle. The case examined the manner in which the application for development consent was handled under the framework governing nationally significant infrastructure in England.

What does the Gatwick northern runway project involve?

Gatwick, located in Crawley, West Sussex, operates predominantly as a single-runway facility. It currently uses its northern runway only as a standby or emergency strip when the main runway is closed. The airport's proposal envisages moving that runway sufficiently to allow both to operate simultaneously for narrow-body aircraft, either for departures or arrivals.

Gatwick first set out its intention to expand in this way in 2018 and has since pursued a Development Consent Order through the Planning Inspectorate. The Planning Act 2008 treats large runway schemes as nationally significant infrastructure and subjects them to detailed public examination before the relevant Secretary of State decides the outcome.

The proposal would not add new runway pavement of meaningful length. Instead, it relies on reconfiguring the existing layout to deliver additional flight movements and passenger capacity without acquiring greenfield land for a new strip.

Why does the ruling matter?

The court's decision maintains the legal foundation on which the project rests. Without that consent, Gatwick could not lawfully proceed to construction, commissioning and operational transition. By dismissing the challenge, the court has allowed the airport and its airlines to plan around a known regulatory framework rather than face continued uncertainty.

For airlines, the case confirms that the eventual availability of dual-runway operations can enter long-term fleet and route decisions. Gatwick anchors the UK operations of several European low-cost carriers, and any addition to slot capacity has direct implications for network growth and base economics.

For passengers and residents, the ruling does not end debate. Construction planning, environmental obligations, noise mitigation and surface-access improvements will shape how the project actually translates into additional flights.

What comes next?

Gatwick will now need to convert the consent into construction contracts and detailed delivery milestones. The airport has signalled that the northern runway could enter routine service within the latter part of this decade, although the precise timetable depends on construction phasing and engagement with airlines, local authorities and affected residents.

The judgment closes one legal chapter but does not, on its own, deliver additional capacity. Whether Gatwick can convert the consent into operational dual-runway activity before the end of the decade will depend on capital commitments from the airport's owners, airline readiness to redeploy capacity, and the resolution of remaining planning conditions attached to the consent.