Heathrow Airport, also known as London Heathrow or LHR, is a major international airport in London, United Kingdom. Heathrow is the second busiest airport in the world (after Dubai International Airport) by international passenger traffic, as well as the busiest airport in Europe by passenger traffic, and the seventh busiest airport in the world by total passenger traffic. It is one of six international airports serving Greater London. In 2018, it handled a record 80.1 million passengers, a 2.7% increase from 2017 as well as 477,604 aircraft movements, an increase of 1,821 from 2017.
Heathrow lies 14 miles (23 km) west of Central London, and has two parallel east–west runways along with four operational terminals on a site that covers 12.27 square kilometers (4.74 sq mi).
Heathrow Airport has 5 terminals - Terminal 1 is currently closed due to refurbishment
International connections do not require going through Immigration but all International to Domestic connections do. Domestic to International connecting passengers can use special Immigration check points if baggage is already checked.