Flight Delay Percentage Calculator
Express an entered flight delay as a percentage of a positive scheduled flight duration.
How to use Flight Delay Percentage Calculator
1. Enter Scheduled Flight Duration, Delay Duration. 2. Both durations use elapsed time. The scheduled duration must be positive; a delay longer than the schedule can legitimately produce more than 100%. This does not calculate compensation. 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?
Express an entered flight delay as a percentage of a positive scheduled flight duration. Both durations use elapsed time. The scheduled duration must be positive; a delay longer than the schedule can legitimately produce more than 100%. This does not calculate compensation.
How the calculation works
Delay percentage = delay duration ÷ scheduled flight duration × 100. Both durations use elapsed time. The scheduled duration must be positive; a delay longer than the schedule can legitimately produce more than 100%. This does not calculate compensation. Durations round to the nearest second; other quantities round to at most six decimals (percentages to two). Nonzero subprecision values are identified.
Example
Worked example: Scheduled Flight Duration = "2 h 30 min"; Delay Duration = "45 min". Result: 30%.
Practical tip
For a 150-minute scheduled duration, a 45-minute delay is 30%; the delay is not a share of the delayed total duration.
Frequently asked questions
What does this result assume?
Both durations use elapsed time. The scheduled duration must be positive; a delay longer than the schedule can legitimately produce more than 100%. This does not calculate compensation.
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?
Percentages round to at most two decimal places, with nonzero subprecision results identified. A delay can exceed 100% of scheduled duration.