SWISS recorded 150 flight diversions in 2025, equivalent to approximately one diversion every 2.5 days, as the airline operated about 143,000 flights during the year. The figure means that diversions affected roughly 0.1% of SWISS services, or one in every 1,000 flights. Weather conditions and technical incidents were the most common reported causes.
The figures, published in SWISS Magazine, provide an overview of the airline’s operational performance across its network rather than relating to a particular airport, route or aircraft type. They do not include a full breakdown of diversions by cause or information on passenger disruption.
Annual totals can be influenced by periods of severe weather or other temporary operational disruptions. Compared with the previous year, SWISS also recorded more diversions linked to drone sightings near airports, while air-traffic-control outages and poor visibility featured among the other reported factors. The available data does not establish how many of the 150 diversions were attributable to each cause.