Open derived outputs

Data catalogue

Monthly files

These files contain derived metrics, not the CAA raw CSV.

cells with fewer than 20 known operations are not published.

View the quarantine and corrections ledger.

CSV field dictionary

Field	Meaning	Typed unit
`entity_key`	Stable entity identifier	`identifier`
`period`	CAA reporting month in YYYYMM form	`calendar_month`
`entity_type`	UK, airport, airline, country, or route grouping	`category`
`direction`	Arrival, departure, or combined direction	`A_or_D_or_ALL`
`n`	Matched operated movements plus short-notice cancellations	`known_operation_count`
`suppressed`	Whether the cell is withheld because n is below 20	`boolean`
`descriptive`	Whether n is 20–49 and ranking is prohibited	`boolean`
`otp15`	Share within 15 minutes, including early movements	`share_of_known_operations`
`otp30`	Share within 30 minutes, including early movements	`share_of_known_operations`
`otp60`	Share within 60 minutes, including early movements	`share_of_known_operations`
`otp120`	Share within 120 minutes, including early movements	`share_of_known_operations`
`otp180`	Share within 180 minutes, including early movements	`share_of_known_operations`
`otp360`	Share within 360 minutes, including early movements	`share_of_known_operations`
`avg_positive_gate_delay`	CAA-published average positive gate delay; early is zero	`minutes_per_matched_operated_movement`
`cancel_rate`	Short-notice cancellations divided by known operations	`share_of_known_operations`
`disruption`	Over-15-minute delays plus short-notice cancellations	`share_of_known_operations`
`sdi_3h`	Gate delays over three hours	`share_of_known_operations`
`dmi_operated`	Weighted delay severity among matched operated movements	`index_0_to_100`
`unmatched_pressure`	Unmatched actual movements divided by all reported operations	`share_of_all_reported_operations`
`compensation_exposure_gbp`	Three-hour-plus delayed movements multiplied by the UK261 amount for each known-distance route	`estimated_gbp_for_3h_plus_matched_operated_movements_on_known_distance_routes`
`ukfdi_actual_mix`	UK disruption using the observed traffic mix	`share_of_known_operations`
`ukfdi_fixed_basket`	UK disruption using the prior same-month fixed basket	`share_of_known_operations`
`dcq_coverage`	Published coverage of the CAA summary denominator	`share_of_summary_operations`
`dcq_consent_gap`	One minus DCQ coverage	`share_of_summary_operations`

Use and attribution

The derived outputs are licensed under CC BY 4.0. Raw CAA data is not redistributed — obtain it from caa.co.uk.

cells with fewer than 20 known operations are not published.

Changelog

Initial deterministic C0 publication through June 2026.

Citation

UK Flight Delay Index (202606). Derived public dataset through June 2026. Derived from UK Civil Aviation Authority punctuality statistics. https://flightdelayindex.com/data/

BibTeX-like citation

@dataset{uk_flight_delay_index_202606,
  title = {UK Flight Delay Index derived public dataset},
  year = {2026},
  month = {06},
  publisher = {flightdelayindex.com},
  url = {https://flightdelayindex.com/data/},
  note = {Derived from UK Civil Aviation Authority punctuality statistics}
}

Quick answers

What does this record cover?

Published CAA movements, with arrivals and departures kept separate.

Does this predict my flight?

No. Historical monthly aggregates cannot establish the outcome or circumstances of an individual flight.