A domestic flight (or an internal flight) is a flight that takes off from one destination in the UK, and touches down in another destination in the UK, so a domestic flight means flying within the same country.

A domestic flight in the UK is defined as any flight that both departs from and arrives at an airport within the United Kingdom. This includes flights between England, Scotland, Wales, and Northern Ireland. For example, a flight from London Heathrow to Edinburgh or from Manchester to Belfast is strictly domestic. In 2026, these flights are subject to a specific Domestic rate of Air Passenger Duty (APD), which was introduced to encourage more sustainable travel alternatives like rail while maintaining essential air links to the islands. For passengers, a domestic flight means you do not need to clear international immigration or customs upon arrival, though you must still present a valid photo ID (like a passport or driving license) for security and boarding purposes. It is important to note that flights to the Channel Islands (Jersey, Guernsey) and the Isle of Man are also considered part of the domestic common travel area for immigration purposes, though tax and duty-free regulations may vary slightly depending on the specific territory's status in 2026.