Heathrow handled a record 84.5 million passengers in 2025 — the busiest year in its history and the busiest airport in Europe — while operating at the edge of two-runway capacity. The government's green light for a third runway could take it to 150 million. London's hotel market is built on this machine.
84,463,000 passengers in 2025, up 0.7% — a record set despite a substation fire that closed the airport for a day in March and stranded 200,000 travellers. The hub set records in nine of twelve months, had its busiest day ever on 1 August (270,000+ passengers), and finished December as Europe's most punctual hub: 97% of passengers through security in under five minutes.
The market mix is the hotel market: EU traffic 28.4 million (+1.1%), North America 20.6 million, Middle East 8.8 million (+2.8%), Asia-Pacific 11.0 million (+2.6%). The growth is long-haul; the constraint is concrete. Heathrow runs at 98% of capacity, which is why the third runway — approved in principle, targeted for the 2030s — is the single largest lever on UK hotel demand.
London's supporting system is itself a top-tier network: Gatwick (~43M, the busiest single-runway airport in the world), Stansted (30M+, record year, Ryanair's fortress), City (3.5M, the business district's private terminal) and Luton (~17M). Together the six-airport system moved roughly 180 million passengers in 2025 — more than any other city system on earth except New York's.
Heathrow's record year landed directly on west London and the Bath Road corridor, but the real signal is Mayfair: long-haul growth from the Middle East and Asia feeds the palace-tier conversion pipeline. When the airport is full, the city prices up. Watch the third-runway consultation: every year of delay is a year of defended ADR for the hotels already built.
Subscribe to the digest and receive key market signals every two weeks.