Glossary
Minimum Connection Time
Definition: Minimum connection time (MCT) is the shortest legally permitted time between connecting flights at an airport, set by aviation authorities based on the airport’s layout, terminal configuration, and security requirements.
MCTs vary significantly between airports and connection types. A domestic-to-domestic connection at a small airport might require only 30–45 minutes, while an international-to-international connection at a large hub like London Heathrow might require 90–120 minutes or more.
Factors affecting MCT include: terminal layout and distance between gates, whether customs/immigration clearance is required, security re-screening requirements, and whether a bus or train is needed between terminals. Airlines and GDS systems enforce MCTs — you cannot book a connection shorter than the published MCT.
For business class travellers, fast track security and priority immigration help make tight connections more comfortable, but the MCT still applies. BookMyBusinessClass agents consider MCTs when building itineraries, typically recommending connections 30–60 minutes above the minimum to provide a comfortable buffer for lounge visits and unexpected delays.