Why does Heathrow switch runways in mid-afternoon?

During westerly operations, Heathrow alternates runway use to provide nearby communities with breaks from aircraft noise. One runway handles arrivals and the other departures, with a switch scheduled for 15:00.

The pattern also changes between weeks to share the quieter periods. The airport’s explanation ties this arrangement to westerly operations.

It is not a universal rule for every wind direction. Weather, delays or works can require changes. A runway switch alone does not indicate an aircraft problem.

Runway alternation at Heathrow is linked to managing aircraft noise for nearby communities. During westerly operations, the airport's published arrangement gives residents alternating periods affected by arrivals and departures. The planned mid-afternoon change is part of an operating pattern, not evidence that an aircraft has encountered a problem.

The arrangement can vary with wind direction, safety, maintenance and other operational requirements. Observing which runway is used does not, by itself, predict whether a flight will be punctual. For nearby residents, the airport's notices explain the applicable pattern. For travellers, airline schedules, boarding information and the live flight status remain the relevant sources.