EUROCONTROL: Summer Air Traffic in Europe is Increasing, Risk of Delays Also Rises

European aviation has entered the summer peak season: according to EUROCONTROL's fresh Week 25 Flash Briefing published on June 24, an average of 35,319 flights operated in the network between June 15 and 21, which is 2 percent higher than the 2025 level. The picture shows not a crisis, but a tightly operating system: this summer has been more punctual so far than last year, but due to thunderstorms, crowded airspace, and several persistent capacity bottlenecks, Hungarian travelers should also plan with more buffer time.

This news is important because delays do not only occur where the problem originates. A French, Spanish, Greek, or British airspace restriction by the end of the day can affect rotations in Budapest, Vienna, or London, especially if an aircraft completes several short European rotations on the same day. Those departing from Budapest Airport in the summer, using Vienna Airport as an alternative, or planning a London transfer or city visit, should not only monitor the ticket price now: schedule buffers, transfer times, and real-time flight information are at least as important.

What does the fresh EUROCONTROL report show?

According to EUROCONTROL data, the first three weeks of the 2026 summer period started overall better than 2025: traffic increased by 1.4 percent, arrival punctuality improved by 1.7 percentage points, and air traffic flow management, or ATFM delays, were 17 percent lower than the previous year. At first glance, this is favorable news, as it indicates that network planning, capacity management, and weather scenarios are working.

However, the details urge caution. In week 25, ATFM delays averaged 2.8 minutes per flight, of which 2.3 minutes were en-route airspace delays and 0.5 minutes were airport ATFM delays. A total of 45,384 flights were affected by some form of air traffic flow management restriction, representing a daily average of 6,483 flights and 18 percent of all flights. Delays increased by 25 percent compared to the previous week, mainly due to convective, stormy weather.

In other words: European aviation has not collapsed, but the system has little flexible reserve. When the weather is good, the planned capacity may be sufficient. However, when storm zones, route avoidances, staffing limits, or a major airport disruption appear simultaneously, delays accumulate quickly.

Where are the main bottlenecks now?

EUROCONTROL highlighted France, Spain, and Greece among the network hotspots so far this summer. France was responsible for 28 percent of the network's en-route delays this year, with the Reims, Marseille, and Brest area control centers being particularly important. In the French situation, capacity, staffing, and technological transition factors also play a role, although the average en-route delay is still lower than in the same period last year.

In the case of Spain, the report mentions 22 percent of delays, mainly in connection with the Barcelona, Seville, and Madrid areas. Here, high traffic growth, capacity, and staffing issues together create pressure. Greece's 14 percent share is particularly interesting due to summer tourist routes: the Athens and Macedonia areas may experience greater loads not only due to Mediterranean holiday traffic but also due to traffic rearrangements related to the Middle East.

The report also mentions Hungary, but not in an alarming context: traffic distribution continues to be influenced by the Middle East crisis, and because of this, lower traffic levels are seen in Hungary, Bulgaria, Romania, and Turkey, while strong growth is occurring in several Southeast European and Southwest European regions. This means that the risk of delay for Hungarian travelers often originates not from Hungarian airspace, but from the situation in the destination country, the transfer point, or the aircraft's previous route.

Why does this matter to Hungarian travelers?

A significant portion of Hungarian passengers travel on European holiday routes, with transfers in London, Paris, Spain, Greece, Turkey, or the Middle East. For these flights, a 30-60 minute slip is not a tragedy in itself, but with a tight transfer, late evening arrival, or a last-day return trip, it can cause serious problems. In the summer schedule, aircraft utilization is high, crew working hours are limited, and replacement capacity is tight for many airlines.

This is especially noticeable if the passenger is not traveling on a single point-to-point flight, but combines multiple tickets, separately booked transfers, accommodation, or ship departures. For example, a late departure from Budapest could delay a onward journey from London; a day at Heathrow or Gatwick disrupted by a storm could have a ripple effect on evening flights to Hungary. Recent British examples clearly show that thunderstorms and associated air traffic restrictions can disrupt the schedules of hundreds of flights within a few hours.

London is a particularly good example for Hungarian travelers in this regard, as many use it from both Budapest and Vienna. Those flying to Heathrow or Gatwick should check the Heathrow online flight information and Gatwick online flight information before departure, but it is equally useful to follow the Budapest live airport schedule and the Vienna flight status.

Budapest, Vienna, and London: Not Just the Price Matters

Hungarian travelers often compare departures from Budapest and Vienna, especially for London, North America, or distant transfers. This can still be a rational decision, but during the summer peak, it is worth calculating the total travel risk. Between the Budapest-London Heathrow, Budapest-London Gatwick, Vienna-London Heathrow, and Vienna-London Gatwick routes, not only the ticket price, but the time of departure, the airline's schedule buffer, the return time, and any potential transfer can be decisive.

If someone is traveling for just a long weekend, a late evening arrival or a Sunday evening return may carry greater risk, as there is less flexibility for the following day. For family vacations, the luggage, children, pre-booked transfers, and accommodation can make one more sensitive to schedule slips. For business trips, the first flight of the morning is often a better choice, because if the previous day's delays do not carry over, there are more correction options at the start of the day.

What can the passenger do before departure?

The most important advice is not to avoid flying. Based on EUROCONTROL data, the network is overall in a manageable state, and several indicators are better than last year. The lesson is rather that in the summer peak, tight, minute-calculated travel plans are more fragile.

• For transfers, it is worth leaving at least 90-120 minutes of buffer at large European airports, and even more for separate tickets.
• Before departure, it is advisable to check not only the airline's app but also the live boards of the departing and arriving airports.
• During stormy periods, it is important to monitor the weather at the destination and transfer point, as the delay does not always originate at one's own departure airport.
• For separately booked accommodation, transfers, or trains, it is advisable to choose flexible modification terms if the price difference is not too large.
• Early dawn or morning departures often represent less risk than the last available flight planned for the end of the day.

What is expected in the coming weeks?

According to EUROCONTROL, traffic may continue to increase in the coming period, and loads exceeding 37,500 flights are conceivable on Friday peaks. This could already exceed the previous European network record set in 2019. The organization therefore considers it particularly important that air navigation service providers maintain the capacities committed in the Network Operations Plan, and that airlines operate with realistic turnaround times and disciplined flight plan execution.

The passenger will perceive this in that on some days everything proceeds smoothly, while on other days, several small delays add up due to air traffic control, weather, and aircraft rotation. A delay does not always mean a flight cancellation, and not every slip entitles one to automatic compensation, especially if the main cause is extreme weather or air traffic restrictions. At the same time, the passenger still has the right to information, care, and the rebooking or refund options offered by the airline according to the relevant rules.

Summary

Based on fresh EUROCONTROL data, Europe's 2026 summer aviation operates as a strong but sensitive system. Traffic is increasing, and more indicators are more favorable than last year; however, thunderstorms, airspace restrictions, capacity points in France, Spain, and Greece, and the Middle East traffic rearrangement together create an environment where a good travel plan no longer just means a cheap ticket.

Hungarian travelers should therefore handle summer flying with more buffers: check flight status, avoid overly tight transfers, choose flexible services, and not arrive at the airport at the last moment. Those who plan this way will not necessarily find the busy European summer problematic, but it will hold fewer unpleasant surprises.