Heathrow warns third runway could slip to 2039

Heathrow Airport has warned the Government that its planned third runway may not open until 2039, four years later than the current target of 2035.

The airport is understood to have told ministers that meeting the 2035 deadline is not achievable under the existing planning and regulatory timetable.

Planning by 2029

Heathrow aims to secure planning permission by 2029. It has always regarded building the new runway within a decade as a reasonable goal, and its bosses believe it could be delivered more quickly, but say that may require further regulatory barriers to be removed beyond the planning reforms the Government has already made.

The Government's response

The Department for Transport said the target had "always been ambitious" and that it would continue working with everyone involved on the project.

The Government confirmed in November 2025 that Heathrow's proposal would form the basis of the expansion, with the stated aim of bringing a third runway into operation by 2035.

A long-running debate

A third runway at Heathrow has been debated for decades. Supporters say it is vital for Britain's economy, trade and connections with the rest of the world, as the airport is already operating close to its capacity. Opponents have raised concerns about noise, air quality and the impact on the UK's climate targets.

What it means for Birmingham

Airport capacity in the south east affects the whole country. Birmingham Airport, which serves the region, has been growing its own passenger numbers, and the debate over Heathrow often raises questions about how much air travel should be spread across regional airports.

High Speed 2 will also change the picture in time, with its planned Old Oak Common station in west London offering a connection towards Heathrow for passengers travelling from Birmingham. For many travellers in the city, though, Birmingham Airport itself will remain the more convenient choice for holidays and short business trips.