Free Online Layover Duration Calculator
Calculate connection time and flag risky layovers.
If the departure time is earlier than the arrival time, the calculator rolls the departure to the next day when overnight connections are allowed. Terminal transfer time covers deplaning, walking, trains, and security or immigration where required.
Minimum connection times vary by airport, terminal and whether bags are checked through. Always confirm the figure with your airline; a purchased ticket that violates the minimum may not be protected if you miss the onward flight.
About the Layover Duration Calculator
A layover is the time between landing on one flight and departing on the next. This calculator converts that window into a practical connection assessment by subtracting the time needed to move between terminals and comparing the remainder with a minimum connection time. It is useful for travelers comparing itineraries, travel agents checking unusual routings, and anyone who wants to know whether a cheap ticket leaves a realistic margin for delays.
Why transfer time is separate from connection time
The clock time between arrival and departure is not all available for a relaxed connection. Passengers must wait for the aircraft door to open, walk or ride to the next gate, clear security in some airports, and be at the boarding door before it closes. Transfer time removes those unavoidable minutes from the usable window. A 105-minute connection with 25 minutes of terminal movement leaves 80 usable minutes. Comparing that 80 minutes with the published minimum is more meaningful than comparing the raw 105.
Reading the safety badge
The badge turns the arithmetic into a quick decision. When usable time meets or exceeds the minimum, the connection is marked safe, with the surplus shown as a buffer. When usable time falls short, it is marked risky and the shortfall is highlighted. A small positive buffer is not a guarantee, because an inbound delay can consume it in minutes. Many experienced travelers prefer at least 60 to 90 minutes for a domestic connection and two to three hours for an international transfer with immigration and baggage recheck.
Overnight and long connections
If the outbound departure clock time is earlier than the inbound arrival time, the departure must be on the following day. The overnight option adds 24 hours automatically, so a 22:40 arrival and a 06:15 departure is correctly read as a 7 hour 35 minute connection rather than a negative gap. Turn the option off when both times are known to be on the same day. Long connections of many hours are common at hub airports, and the calculator will still report the full duration and buffer.
What the calculation leaves out
The tool assumes both times are local to the same airport, so it does not adjust for time zones between airports. It also does not know about inbound delays, gate changes, baggage transfer, visa checks, airline cut-off rules or the difference between a protected and an unprotected itinerary. A self-transfer booking usually requires more margin because you must collect bags and check in again. Use the result as a planning guide, then confirm the official minimum connection time for your terminal and airline.
Frequently asked questions
What counts as a risky layover?
A layover is risky when the usable time after transfer is below the minimum connection time, or when the buffer is so small that a normal delay would break it. The badge uses the minimum you enter, so adjust that number to match the airport and your own comfort level.
Does the calculator handle an arrival at night and departure the next morning?
Yes. With overnight connections enabled, an outbound time that is earlier than the arrival time is treated as the next day. The full overnight window is included in the connection duration.
Should I include baggage claim in terminal transfer time?
Include it whenever you must collect and recheck bags, such as on a self-transfer or when entering a country for the first time. Add realistic walking, immigration and security time rather than using only the gate-to-gate walk.