Greece radar failure triggers delays, diversions, and cancellations across Europe

Disruption overview

Flights across Greece were disrupted on 27 July 2026 after a failure in the country's main radar system used to monitor flights forced controllers to reduce capacity and slow traffic through a key eastern Mediterranean corridor. Departures from Athens International Airport and Thessaloniki Airport were among those initially halted, while other flights were delayed, diverted, or rerouted around Greek airspace, creating knock-on problems across Europe at the height of the summer season.

Because the disruption appears to stem from an air traffic control technical failure outside airline control, compensation under EC 261 is unlikely for most passengers. Even so, airlines should still provide care and assistance during long delays, including refreshments, rebooking, refunds, and overnight accommodation where needed.

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Disruption details

Flights across Greece and beyond were disrupted on 27 July 2026 after a failure in the country's main radar system used to monitor flights forced controllers to cut capacity across Greek airspace. The outage hit just after midday local time and immediately affected departures from Athens International Airport and Thessaloniki Airport, with knock-on problems spreading across Europe during the busy summer travel period.

For passengers, this meant ground stops, longer waits, diversions, and last-minute cancellations. Some travelers were left in crowded terminals, while others reached their destination late at night after aircraft and crews fell out of position.

With radar coverage reduced, controllers had to keep bigger gaps between aircraft and slow traffic through one of the busiest corridors in the eastern Mediterranean. Aircraft already in the air were told to hold or route around the affected sectors, which quickly pushed disruption beyond Greece itself.

The disruption reached well beyond mainland Greece:

• Departures from Athens International Airport and Thessaloniki Airport were among those initially halted.

• Some long-haul flights to Egypt, Israel, Cyprus, and the Gulf took longer routings to avoid Greek airspace, while others diverted for fuel.

• A number of island shuttle flights were canceled after crews approached duty-time limits.

Because Greece sits on major routes between Western Europe and the Middle East, no single airline escaped the impact. Flights that were not due to land in Greece were still affected if they needed to cross the country's airspace or wait for new slots, turning a national systems problem into a wider European scheduling issue within hours.

Airlines responded with rolling delays as they tried to protect later departures and recover aircraft rotations. Tour operators also reported disruption to change-over flights, and some passengers faced even longer journeys as onward connections unraveled and late arrivals pushed planes and crews out of rotation.

The timing made the disruption especially difficult to absorb. Late July is one of the busiest periods of the year for Greek airports, island routes, and package holiday traffic, so even a short loss of capacity can keep affecting schedules well into the evening and the following days.

The Hellenic Civil Aviation Authority hasn't yet explained the exact technical fault. Possible causes include a power-supply interruption or a software problem in the systems used to process flight data, and investigators are expected to examine how quickly backup systems were activated and how flow restrictions were coordinated with neighboring states.

Core radar coverage was restored later the same day, but that doesn't mean schedules will recover immediately. Airlines and airports warned that residual disruption could continue for several days while aircraft and crews are repositioned and maintenance plans are adjusted.

If your journey was affected, it's understandable to want clear answers about your rights. Because this appears to be an air traffic control technical failure rather than a problem caused by an airline, compensation under EC 261 is unlikely in most cases.

That said, you're not without support. Airlines should still provide care and assistance during long delays, including food and refreshments, rebooking or a refund if your flight was canceled, and accommodation if an overnight wait becomes necessary. If you'd like to understand what may apply to your trip, AirHelp's free flight checker is a simple place to start.

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