Minimum Connecting Time (MCT)

Minimum Connecting Time is the shortest amount of time officially required to transfer a passenger and their checked luggage from an arriving flight to a departing flight at a given airport. It's set by airport authorities working with airlines, customs, and ground handlers, then published in systems like IATA's Timatic and major GDS platforms. If a layover falls below the published MCT, the booking system will block or flag the itinerary.

MCT is calculated separately for domestic-to-domestic, domestic-to-international, and international-to-international transfers because each involves different security, customs, and immigration steps. A single-terminal airport like Singapore Changi may publish an MCT of 45-60 minutes, while an airport requiring inter-terminal transport like London Heathrow can require 60-120 minutes. Airlines can also apply their own MCT that overrides the airport's published minimum when you book on that carrier.

Airport MCT is the baseline transfer time set by the airport authority for all carriers using that facility, while airline MCT is a carrier-specific minimum that can be longer for operational reasons, such as extra bag-transfer time or gate distance. When an airline's MCT exceeds the airport standard, the airline's number is the one used to determine whether your connection is sellable as a single itinerary. Reservation systems always apply whichever MCT is stricter.

Yes, but only if your itinerary is booked as a single ticket and the layover met the published MCT at booking time — the airline is then liable for rebooking you if its own delay caused the miss. Passengers who self-connect on two separate tickets get no MCT protection, even if the airport's minimum time was technically met. This is a key reason single-ticket connections through an interline agreement are safer than piecing together separate bookings.

Add a buffer beyond the published MCT rather than booking the exact minimum — for example, if Chicago O'Hare's MCT for an international-to-domestic connection is 90 minutes, aim for 2 to 2.5 hours when self-booking. International-to-international connections requiring passport control need the largest buffer, since immigration lines aren't factored precisely into every airport's MCT calculation. Regional airports can be as low as 30 minutes, so always check the specific airport-terminal pairing rather than assuming a round number like 60 minutes is safe.

MCT values are stored in centralized databases used by every major global distribution system and checked automatically by travel agents, airline staff, and online booking engines before an itinerary is confirmed. You can also ask an airline directly or check IATA's Timatic database for the exact airport, terminal, and connection-type combination. These values are not something typically shown to the average traveler unless the connection fails to meet them, triggering a booking block.

Yes — self-connecting on two separate tickets means neither airline is responsible for rebooking you or covering costs if you miss the second flight, even if the first flight's delay wasn't your fault. A single ticket with an interline agreement between the two carriers ensures the connection meets MCT and gives you rebooking protection during IRROPS (irregular operations). CEOFLIGHTS specialists can help find discounted business class fares — call (888) 851-6897.