Istanbul has recorded its heaviest rainfall on record, triggering widespread disruption to flights and ground transport across one of the world's busiest aviation hubs. As of Thursday, 51 flights bound for Istanbul Airport had been diverted and 19 cancelled, with 16 roads closed and residents asked to stay home unless absolutely necessary. Heavy rain is expected to continue through the weekend, and motorcycles have been banned from the roads until further notice. Authorities are advising travellers to delay non-essential trips and avoid underpasses and low-lying areas. If your connection through Istanbul is on shaky ground, our what is US Approach about guide offers low-effort entertainment while you wait for updates.

Istanbul Airport is a critical global transfer point, particularly for passengers moving between Europe, Asia and Africa, so even partial disruption ripples far beyond Turkey. Diverted flights add hours to journeys and can strand transit passengers in unexpected cities, while cancellations trigger a cascade of rebooking pressure across airline networks. Travellers with itineraries routed through Istanbul over the coming days should treat their plans as provisional and check their flight status directly with the airline before leaving for the airport.

The weather event is notable for its severity. Record rainfall in a single day overwhelmed drainage systems in parts of the city, flooding roads and snarling the airport access routes that passengers and crew depend on. When access roads flood, the problem compounds: even if a runway can handle a landing, getting aircraft, crews and passengers to the terminal becomes its own logistical challenge. Airlines typically respond by trimming schedules pre-emptively, which is why cancellations have climbed even for flights that might otherwise have operated.

If you are affected, the first move is to contact your airline through its app or website rather than queuing at an airport service desk, since agents there will be dealing with the same flooded-terminal chaos. Most full-service carriers will rebook you onto the next available flight at no charge when a cancellation is weather-related, though compensation rules for weather events are generally narrower than for airline-caused disruptions. Keep all receipts: hotels, meals and transport costs from a diversion are often claimable through travel insurance.

There is also a safety dimension worth remembering. Pilots and dispatchers divert rather than attempt landings in extreme rain because wet runways lengthen stopping distances and gusty storm cells can make approaches unsafe. A diversion is frustrating, but it is the cautious and correct call — the 51 diverted flights in Istanbul this week are evidence of crews choosing safety margins over schedule pressure. Passengers should factor that mindset into their plans and avoid trying to rebook onto flights that are likely to face the same weather.

With more rain forecast for the weekend, the advice from authorities stands: delay non-essential travel, allow generous transfer times, and monitor airline advisories closely. Istanbul has weathered major storms before, and operations will normalise as the rain eases — but for now, flexibility is the traveller's best friend. Stuck somewhere with only your phone? Our where to watch US Approach page lists the apps that carry the short drama, ideal for an unplanned layover.