Europe’s heatwaves keep disrupting flights as most passengers never complain

New data shows Europe’s network-wide flight punctuality improved in May 2026 even as heatwaves, strikes and local bottlenecks continued to cause major disruption at specific airports and airlines. A separate UK consumer survey found 85% of disrupted passengers never filed a formal complaint, raising concerns that many travelers are missing compensation they may be owed.

Why it matters: - Europe’s overall flight performance is improving, but passengers are still facing severe disruption on individual routes when heat, strikes or local capacity limits hit. - The complaint gap is a bigger issue for travelers’ wallets: most disrupted passengers never pursue a claim, even when compensation may be available under UK261 or EU261.

What happened: - Europe is in its third major heatwave of 2026, with temperatures forecast to reach the low-to-mid 40s°C across Spain, Portugal and France this week. - EUROCONTROL’s Network Operations Report for May 2026 showed 1,933,830 minutes of total ATFM delay across the European network. - That total was down 23.7% from May 2025. - Network-wide arrival punctuality improved to 79.1%, up 1.7 percentage points year over year. - Departure punctuality rose to 75.0%, up 2.3 points. - Average en-route delay per flight fell to 1.40 minutes from 1.62 minutes a year earlier.

The details: - En-route ATC capacity remained the largest cause of delay across the network, even though it improved 16.0% year over year. - Weather-related factors accounted for roughly 47% of all en-route ATFM delay minutes. - France and Germany were the hardest-hit countries in those weather delays. - Barcelona’s air traffic control centre was among the biggest single contributors to delay in May. - On 21 May, the first day of a record European heatwave confirmed by Copernicus, weather restrictions caused 1,391 delays and 62 cancellations across Europe. - The 21 May disruption totaled 1,453 affected flights. - Amsterdam Schiphol, Barcelona, Rome Fiumicino, Copenhagen, Oslo and Stockholm were among the worst-hit hubs. - British Airways, SAS, Norwegian, Austrian Airlines and Icelandair saw knock-on disruption. - A second major heatwave hit in late June, and a third is building in mid-July. - Iberia and southern France are again forecast to reach the low-to-mid 40s°C. - Heat- and weather-related disruption is typically treated as an extraordinary circumstance, so EC261 and UK261 compensation is unlikely to apply in most cases. - Passengers are still entitled to care, rerouting or a refund. - CAA punctuality data for April 2026 showed that at Birmingham Airport, the majority of scheduled Lufthansa services to Frankfurt and Munich were cancelled. - London Heathrow remained one of Europe’s busiest airports in the period, ranking fifth by daily traffic with more than 1,300 flights a day. - UK airports handled more than 61.4 million passengers in Q1 2026, the highest first quarter on record. - Q1 traffic was up 2% year over year. - Growth was driven largely by short-haul European travel. - Load factors rose to 79%, leaving less spare capacity when disruptions happen. - UK aviation set a record of 302 million passengers in 2025. - The CAA consumer survey found 31% of people plan to fly more in 2026. - That figure rises to 47% among 18–34 year-olds. - The CAA’s Aviation Consumer Survey found 62% of UK travelers had flown in the past year. - Overall satisfaction was 88%, the highest since tracking began in 2016. - Among passengers who experienced disruption, only 15% filed a formal complaint. - Of those who complained, 72% were satisfied with how the complaint was handled.

Between the lines: - The network is recovering on paper, but the data shows a more uneven reality for passengers. - A better monthly average can mask localized failures, especially when weather and operational bottlenecks cluster at specific airports. - The 85% non-complaint rate suggests many disrupted passengers may not understand their rights or may assume the process is not worth the effort. - That leaves money and service remedies unclaimed even when passengers may qualify for compensation.

What’s next: - More disruption is possible as the current heatwave intensifies across southern Europe. - Passengers facing delays of three hours or more, cancellations or denied boarding on flights departing the UK or EU, or arriving in the EU on an EU carrier, may still be eligible for compensation under UK261 or EU261. - Updated CAA Q2 2026 aviation trends and May 2026 punctuality data are expected in July or August 2026. - The release will be updated once those figures are published.

The bottom line: - Europe’s air network is performing better overall, but extreme heat and local bottlenecks are still causing costly disruption for many passengers — and most of them are not claiming what they may be owed.