How Much Time Do You Need Between Connecting Flights?
For a connection on one ticket, treat 90 minutes as the practical floor for international transfers at familiar mid-size hubs, two hours at the world’s mega-hubs or when arriving from abroad and re-clearing security or borders — and several hours, or an overnight, for any self-transfer on separate tickets. Airlines sell connections at their own legal minimums; legal does not mean comfortable.
How Much Time Do You Need Between Connecting Flights?: questions people actually ask
Is a 45-minute connection enough?
It is sellable at some airports on one ticket, and it will sometimes work — but any delay eats it entirely. If the trip can absorb a rebooking, it is acceptable; if not, choose a longer layover or a direct flight.
Do I have to recheck bags on a connection?
On one ticket, checked bags normally flow to the final destination — except where customs requires re-collection, the US being the classic case. On separate tickets you always recheck: allow time for it.
What happens if I miss my connection?
On one ticket the airline rebooks you on the next available seats at no cost. On separate tickets you own the problem — the second airline treats you as a no-show. This single difference is why self-transfers need hours of margin.
What “minimum connection time” actually means
Every airport publishes a minimum connection time (MCT) — the shortest interval at which the airline’s systems will even sell a connection. It assumes everything works: your first flight lands on time, the bags make it, the transfer path is walkable, and you know the terminal. It is a floor for the airline’s convenience, not a margin for yours. When the first flight runs 40 minutes late — a normal event at any busy airport — a 55-minute connection is gone, and on a single ticket the airline then owns the rebooking; comfortable for the schedule, less so for your plans.
What changes the calculation
Four things add time. International arrivals that clear immigration and customs before connecting (the United States above all — every entry clears at the first airport). Terminal changes, especially where the transfer involves a train or bus between buildings. Separate tickets — self-transfers carry zero protection, so the second flight’s check-in deadline is your hard wall. And peak-hour banks at mega-hubs, where even walking distance cannot save a missed slot. Add margin for each factor that applies, not for all of them at once.
How to choose when booking
On one ticket, a connection the airline sold you is protected — if you miss it through their delay, they rebook you — so the minimum is “safe” in the guarantee sense. The question is whether your trip tolerates the rebooking scenario: same-day events, cruises and tours argue for longer layovers or direct flights. On separate tickets there is no protection at all, so the connection needs to survive the pessimistic case on its own — which in practice means building in hours, not minutes. If the second ticket is expensive and the day is important, an overnight near the airport is the honest answer.