Thunderstorms Cause Hours-Long Delays at Heathrow and Gatwick

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Severe thunderstorms breaking a record June heatwave have caused extensive disruption at London’s Heathrow and Gatwick airports, with hundreds of flights delayed or cancelled and some passengers facing waits of up to 11 hours.

Storms End Heatwave and Trigger Air Traffic Restrictions

The latest disruption follows several days of unusually high temperatures across the United Kingdom, culminating in record-breaking heat in parts of south-east England on Friday, 26 June 2026. As the heatwave broke overnight, intense storm cells developed over London and large areas of northwestern Europe, bringing heavy rain, lightning and turbulent conditions.

Publicly available aviation data and media coverage indicate that the rapid change in weather led air traffic managers to introduce temporary flow restrictions across the region. When thunderstorms sit over, or close to, busy approach paths, aircraft movements are slowed or briefly suspended to maintain safe separation between flights. This quickly creates backlogs at major hubs such as Heathrow and Gatwick.

By Saturday afternoon, 27 June 2026, live tracking services were showing widespread knock-on delays across European airspace, not only for flights departing the United Kingdom but also for services inbound from continental cities and long haul routes. The scale of the storm system meant that diversions, extended holding patterns and revised routings were all contributing to longer journey times.

Reports from broadcasters and online travel outlets describe storm bands repeatedly passing over south-east England during the morning and early afternoon, limiting the periods in which controllers could safely increase the rate of take-offs and landings. Each renewed burst of lightning activity led to fresh constraints on airport operations.

Hundreds of Flights Hit With Multi-Hour Delays

Data compiled from flight-tracking platforms suggests that more than 700 flights at Heathrow and Gatwick combined were delayed by Saturday afternoon, with further disruption expected into the evening as airlines attempted to work through backlogs. Some estimates from European and UK news outlets put the total number of affected services across the two airports above 800 once short-haul and long-haul operations were included.

While many departures and arrivals were held for one to three hours, several services experienced far longer waits. Coverage from international and regional news sites highlights cases in which passengers remained on the ground or in terminals for up to 11 hours before eventually departing or learning that their flight had been cancelled. Such extreme delays were most commonly linked to aircraft that had already been rescheduled earlier in the day.

Published reports indicate that both departures and arrivals were affected, with knock-on delays rippling through airline networks. Early morning cancellations on some European routes led to aircraft and crew being out of position later in the day, compounding the effect of ongoing weather-related restrictions. In some instances, flights bound for London diverted to other airports to refuel or wait out the storms.

Some carriers opted to cancel late-evening services rather than operate them at significantly delayed times, citing crew duty limits and the risk of further weather complications. This added to the overall number of passengers needing rebooking on later departures or alternative routings on Sunday and into the new week.

Passenger Experiences of Gridlock and Long Queues

Travelers posting on social media and speaking to broadcasters described scenes of crowded departure halls, long queues at check-in desks, and limited seating near departure gates as the disruption unfolded. Images shared online showed densely packed terminal concourses at both Heathrow and Gatwick, with many passengers sitting on the floor or against walls as they waited for updates.

Accounts gathered by European and UK outlets include reports of passengers spending several hours on board aircraft that remained parked at gates or on taxiways while awaiting revised take-off slots. In some situations, flights that initially boarded on time later returned to stands for refuelling or crew changes after extended delays.

Others reported difficulty obtaining clear information about revised departure times as airlines adjusted schedules in real time. With many services subject to rolling delays, airport displays and mobile applications were updated repeatedly through the day, leading some travelers to wait near gates for far longer than originally expected.

Consumer groups and travel commentators noted that the combination of heat earlier in the week and crowded terminals during the storm-related disruption created particularly uncomfortable conditions for families with young children, older passengers and those with reduced mobility. Many urged travelers due to fly later in the weekend to arrive prepared for extended waits.

Operational Challenges at Heathrow and Gatwick

Heathrow and Gatwick each serve hundreds of departures and arrivals on a typical summer Saturday, leaving relatively little slack in daily schedules when severe weather strikes. Publicly available information from aviation analysts explains that during thunderstorms, ground operations can also be slowed if lightning risk leads to temporary pauses in refuelling, baggage loading and other ramp activities.

Reports from specialist aviation publications indicate that Saturday’s storms caused a series of short but repeated interruptions to both airfield and airspace operations in the London area. Each pause required a subsequent period of careful sequencing as controllers worked flights through narrow weather gaps and adjusted routings to avoid the most active storm cells.

Industry commentary also points out that Heathrow in particular operates close to its maximum declared capacity in normal conditions, leaving it especially vulnerable to cumulative delays once arrival or departure rates are reduced. When holding stacks above the airport reach capacity, inbound services may be routed to more distant waypoints or asked to reduce speed en route, further lengthening flight times.

At Gatwick, which has a high concentration of short-haul and leisure services, the impact of delays can cascade quickly across multiple rotations of the same aircraft during the day. A single late arrival from southern Europe early in the morning can push back several subsequent departures, meaning disruption from the storms is likely to be felt by passengers well beyond the immediate weather window.

What Travellers Should Expect Next

Forecasts from national meteorological services suggest that conditions across south-east England are likely to become less extreme as cooler air moves in behind the thunderstorms. However, published outlooks still point to the possibility of further heavy showers and isolated storm cells into Sunday, meaning additional short-notice restrictions on air traffic cannot be ruled out.

Airlines have begun reshaping their schedules to accommodate aircraft and crew that became out of position during Saturday’s disruption. Public passenger updates advise travellers to monitor airline apps and text alerts closely before setting out for the airport, and to anticipate the potential for further changes even after check-in.

Travel advisers recommend that those due to fly over the next 24 to 48 hours allow extra time to pass through security and border controls, carry essential medications and valuables in hand luggage, and prepare for longer-than-usual waits at gates. For those with tight connections through Heathrow or Gatwick, experts suggest reviewing rebooking rules and minimum connection times, as continued knock-on effects from the storms may still affect onward journeys.

With peak summer travel only beginning, the episode is prompting renewed discussion in the UK about aviation resilience in the face of increasingly volatile weather patterns. Analysts note that extreme heat followed by intense thunderstorms presents a particular challenge for airports, raising questions about how infrastructure, staffing and contingency planning can keep pace with changing climatic conditions.