About the data

LJLJ.si is an unofficial, independent data portal about traffic at Ljubljana Jože Pučnik Airport. It is not affiliated with the airport operator Fraport Slovenija. All data comes from the public sources described below; always check official sources before making travel decisions.

Where the data comes from

The portal combines several independent, publicly available sources: a commercial flight-data API for schedules, statuses and flight times (refreshed roughly every 30 minutes; no collection between 00:00 and 03:00), a public network of community ADS-B receivers for live aircraft positions, public route and aircraft photo databases, official aviation weather sources (METAR/TAF) and open map data. Photos are always published with the photographer credited, and map data with the appropriate attribution on the map. The selection and integration of sources is part of how this project is built, so we do not name individual providers.

Weather data: Open-Meteo.com (CC BY 4.0 licence) and the official aviation weather service. Country flags: Twemoji (CC BY 4.0).

How we measure delay

Flight delay = the difference between the latest known (revised or actual) time and the scheduled time, in minutes. Negative delays (early flights) count as 0 in averages. Cancelled flights are excluded from averages and shown separately. Diverted flights are flagged separately.

Some operators are not tracked live — their flights appear “on time” because no delay is measured. We exclude such flights from punctuality rankings: rankings require a minimum number of measured flights per airline/destination (stated next to each ranking).

What counts as a passenger flight

Statistics cover scheduled and charter passenger flights. Cargo, mail and private/business flights are excluded from statistics and shown separately (“Special visits”, “Cargo routes”). Duplicate entries of the same flight under two flight numbers are removed.

The “Will my flight be delayed?” forecast

The forecast is the share of past flights to the same destination (and at a similar time) delayed by more than 15 or 60 minutes over the last 180 days. Sample size and reliability are shown with the result. The forecast does not take into account weather or conditions on the day of the flight — it is an informative statistic, not a guarantee.

European comparison

We compare the average departure delay at Ljubljana Airport with the average departure delay at European airports as published for the latest period by Eurocontrol CODA (Central Office for Delay Analysis) in its public “Taxi times and delays” reports. The comparison is indicative: CODA measures all European airports together, and the two methodologies differ in details.

Radar and map

The radar shows aircraft within 30 NM (56 km) from the community ADS-B network; between refreshes, positions are extrapolated from heading and speed (dead reckoning, up to 90 s). Aircraft on the route map are flights to or from Ljubljana Airport that are currently airborne. All of this is for information only and is not intended for navigation or operational use.

Time span and completeness of data

Flight history goes back 180 days before 3 August 2026 (archive import) and has been updated continuously since then. Aircraft registrations have been collected since 3 August 2026. Because of source outages, individual flights or fields may be missing; usage counters and the last refresh time are shown in the footer of the archive page.

For the media

When citing data or graphics from this site, please credit “LJLJ.si” with a link. For collaboration or embedding content, please contact the author of the project.