Radar system failure halts flights at Zurich and Geneva as Swiss airspace capacity is halved

A failure affecting the radar picture used by Swiss air traffic controllers briefly halted takeoffs and landings at Zurich and Geneva airports on Tuesday, 20 October 2026. Flights resumed during the afternoon, but air navigation service provider Skyguide cut the capacity of Swiss airspace by 50% as a precaution. The restriction left airlines facing delays even after the immediate suspension had ended.

According to Swiss news agency AWP, reporting Skyguide’s statement, departures and arrivals were temporarily suspended at both airports before operations resumed. Skyguide then halved the amount of traffic controllers could handle as a safety precaution.

The fault affected the radar picture displayed to controllers, not necessarily every radar installation in Switzerland. The display helps them monitor flight paths and maintain safe separation between aircraft. If its reliability is compromised, fewer movements can be handled safely. The 50% capacity reduction did not mean that half of all scheduled flights had been cancelled.

Although aircraft were once again taking off and landing at Zurich and Geneva, restricted capacity could still affect departure slots and the sequencing of arrivals. Aircraft held on the ground may start their next services late, affecting later connections. Initial reports did not provide a verified total of cancelled flights at either airport.

Skyguide activated a crisis management team and said flight safety remained assured. There was no indication of a cyberattack, according to the company. Reuters also reported the precautionary reduction in capacity. Neither the detailed technical cause nor a confirmed timetable for lifting the restrictions was established in the first announcements on Tuesday.

For passengers connecting through Zurich or Geneva, the return of aircraft movements did not necessarily mean schedules had recovered. Airlines and the airports remained the best sources of flight-specific updates.