How connecting flights work: minimum layover times explained
Published September 20, 2026 · Policies verified September 20, 2026
Every airport has a minimum connecting time, and booking systems will not sell you a connection shorter than it. That sounds protective. The part that matters is what happens when the connection fails — and that depends on how the trip was ticketed, not on how long the layover was.
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What a minimum connecting time is
It is a published figure, set for each airport and often for each combination of arriving and departing terminal, domestic or international. It reflects how long it realistically takes to walk, clear immigration where relevant, and have the bags transferred.
Because it is a floor rather than a recommendation, a legal connection is not automatically a comfortable one. A 40 minute connection at a compact airport with the same terminal at both ends can be fine. The same 40 minutes with a terminal change, a passport queue and a bus is a coin toss.
One ticket versus two
Here is the distinction that decides everything. On a single ticket, the airline is responsible for getting you to your final destination. Miss the connection because the first flight ran late and they rebook you, at their cost. If the rebooking does not work for you, DOT rules on significant changes and cancellations apply to the unused portion.
On two separate tickets — the cheap combination that looks clever on a comparison site — the second airline owes you nothing at all. Your missed flight is a no-show against a ticket they sold in good faith, and the fare is usually gone. No rebooking, no refund, no obligation.
That is the trap: self-connecting saves real money right up until the moment it costs you an entire ticket, a hotel night and a new fare bought at the airport.
How much time to actually leave
Give yourself more than the minimum whenever the connection involves a terminal change, an international arrival with immigration, a last flight of the day, or checked bags on a tight schedule. The cost of a longer layover is an hour in a lounge; the cost of a missed one is the rest of the trip.
If you are deliberately self-connecting on separate tickets, treat the gap like a separate journey: several hours, and ideally an overnight if the onward flight is the only one that day.
Bags, borders and the parts that eat the clock
On a single ticket, checked bags are transferred for you, including on most international connections into the U.S. where you clear customs and immediately re-drop the bag. That re-drop is a real step and it is inside your connection time, not after it.
Immigration queues are the least predictable element of any connection. They are not the airline's responsibility and they are not reflected in the minimum connecting time beyond a rough allowance, so an international arrival into a busy hub deserves more slack than the schedule implies.
The last flight of the day changes the maths entirely. Miss a midday connection and you are on the next one in two hours; miss the evening one and you have bought a hotel night and a lost day. When you are choosing between a tight connection and a long one, check what is behind it before you decide the gap is wasted time.
Frequently asked questions
What is a minimum connecting time?
The shortest layover an airline and airport will allow between two flights, published per airport and often per terminal pairing. Booking systems will not sell a connection below it.
Is a 45 minute connection enough?
Sometimes. It is enough when the airport is compact, the terminals are the same and there is no immigration queue. It is risky when any of those change, regardless of the fact that it is technically legal.
What happens if I miss my connection?
On a single ticket the airline rebooks you at no charge, and if the rebooking does not suit you, the DOT refund rules apply to the unused portion. On two separate tickets the onward airline treats it as a no-show and generally owes you nothing.
Are separate tickets ever a good idea?
They can save money on routes with no good single-ticket option, but only if you leave a wide gap and accept that you carry all the risk. Never plan a separate-ticket connection with a short layover.
Does the airline rebook me if I miss a connection on one ticket?
Yes, at no charge, because it is responsible for delivering you to the final destination on the ticket. If the rebooking no longer suits you, DOT rules on cancellations and significant changes apply to the unused portion.
U.S. DOT refund rules for cancellations and significant changes, verified September 2026. Minimum connecting times are published per airport by the airlines and vary by terminal and itinerary type.
Related: checking bags · cancelled flights · changing a flight
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