Flight Duration Calculator
Calculate elapsed flight time from local departure and arrival dates with an explicit arrival-minus-departure UTC-offset difference.
How to use Flight Duration Calculator
1. Enter Departure Date & Time, Arrival Date & Time, Arrival UTC Offset Minus Departure (hours). 2. Enter full local dates, including any date change. A positive offset difference means the arrival clock is ahead. A negative adjusted duration is rejected rather than displayed as a flight length. 3. Select Calculate or press Enter. 4. Select Copy result to copy the answer, or Reset to clear the form and result.
Why use this tool?
Calculate elapsed flight time from local departure and arrival dates with an explicit arrival-minus-departure UTC-offset difference. Enter full local dates, including any date change. A positive offset difference means the arrival clock is ahead. A negative adjusted duration is rejected rather than displayed as a flight length.
How the calculation works
Elapsed flight duration = arrival clock − departure clock − (arrival UTC offset − departure UTC offset). Enter full local dates, including any date change. A positive offset difference means the arrival clock is ahead. A negative adjusted duration is rejected rather than displayed as a flight length. Calendar and clock values are used as entered, independently of the browser time zone. This is a fixed-offset model: named-zone rules, daylight-saving changes, leap seconds and live flight information are not applied automatically. Use offsets valid at the dates concerned. Clock results round the final instant to the nearest second; calendar results stay within years 0100–9999.
Example
Worked example: Departure Date & Time = "2026-10-12T09:00"; Arrival Date & Time = "2026-10-12T14:00"; Arrival UTC Offset Minus Departure (hours) = 2. Result: 3 h 0 min.
Practical tip
A 09:00 departure and 14:00 arrival with a +2-hour offset difference represents three elapsed hours.
Frequently asked questions
What does this result assume?
Enter full local dates, including any date change. A positive offset difference means the arrival clock is ahead. A negative adjusted duration is rejected rather than displayed as a flight length.
Are current travel rules or locations checked?
Calendar and clock values are used as entered, independently of the browser time zone. This is a fixed-offset model: named-zone rules, daylight-saving changes, leap seconds and live flight information are not applied automatically. Use offsets valid at the dates concerned. Clock results round the final instant to the nearest second; calendar results stay within years 0100–9999.
How is the answer displayed?
Elapsed durations round to the nearest second, with nonzero subsecond values identified. Clock outputs show the full date and seconds on the entered or destination clock basis.