Summer and winter flight schedules: what changes for spotters

On the last Sunday in October you turn the clock back an hour – and at airports, half the schedule swaps places in the same night. Holiday destinations disappear, winter routes are added, a long-haul flight suddenly lands an hour earlier, and the aircraft you photographed every Saturday is suddenly a smaller type. The switch between the IATA summer schedule and winter schedule is one of the most important key dates of the year for spotters. This guide explains how the seasons are defined, what slots have to do with it and how to use the weeks around the switch to your advantage.

Summer and winter schedules: the short answer

Civil aviation plans worldwide in two seasons. The summer season begins on the last Sunday in March and ends on the Saturday before the last Sunday in October. The winter season follows directly and runs until the Saturday before the last Sunday in March. These boundaries are set in the Worldwide Airport Slot Guidelines, which IATA, the airport association ACI and the worldwide association of airport coordinators publish jointly.

For you as a spotter, this means: twice a year, destinations, frequencies, aircraft sizes and times all change at your home airport at once. The winter schedule 2026/27 begins on October 25, 2026, the next summer schedule on March 28, 2027.

Why exactly the end of March and the end of October?

The season boundaries are not chosen at random: they coincide with the switch between daylight saving time and standard time in Europe, which also takes place on the last Sunday in March and the last Sunday in October. As a result, airlines only have to adjust their rotations – that is, the sequence of flights an aircraft flies in a day – once, instead of first reacting to the new time and a few days later to a new schedule.

You may know the abbreviations from press releases: S26 stands for summer 2026, W26 for winter 2026/27. The number always denotes the year in which the season begins. So if you read “new route from W26”, the route is planned from the end of October 2026.

At about seven months, the summer season is considerably longer than the winter. That fits travel behavior in Europe: from Easter to the autumn holidays, demand for vacation flights is highest, and that is exactly when leisure airlines fly their densest programs.

Slots: the framework behind the schedule

If you want to understand why airlines think so strictly in seasons, you cannot get around slots. At heavily used airports, not everyone may take off and land whenever they like. There, an independent coordinator allocates time windows for every movement. In the EU, Regulation (EEC) No 95/93 forms the legal basis; in Germany an ordinance determines which airports are coordinated, and the slots themselves are allocated by Flughafenkoordination Deutschland (Airport Coordination Germany). Large hubs such as Frankfurt Airport and Munich Airport are among them.

Slots are always allocated for a season. The decisive mechanism is the so-called historic precedence (“grandfather rights”): if an airline has flown a slot series at least 80 percent of the time in a season, it may claim the same series again in the next equivalent season – summer to summer and winter to winter, not summer to winter. This rule is often called “use it or lose it”.

All of this is agreed at the IATA slot conferences, which take place twice a year: in June it is about the coming winter, in November about the following year’s summer. There, airlines and coordinators negotiate times and swap slots. For you this is a useful hint: what is negotiated in June and November lands months later at your fence as a new route or new time.

What changes for spotters with the switch

For passengers, a few departure times shift. For you, the subject at the fence changes – and on several levels at once.

What changes	Typical in the summer schedule	Typical in the winter schedule	What it means for you
Leisure traffic	dense programs to the Mediterranean, many extra flights on weekends	less Mediterranean, but Canary Islands, long-haul destinations, winter sports regions	you see leisure airlines and their colors in masses in summer, more selectively in winter
Long-haul	seasonal summer routes, often more frequencies	some routes pause, others are added	new visitors or missing regulars at your home airport
Aircraft size	often larger equipment on popular routes	adjustment to lower demand	a type you otherwise had daily may be missing for weeks
Times	daylight saving time in Europe	standard time in Europe	arrivals from countries without a clock change shift by an hour
Daylight	long evenings, early sunrises	evening arrivals often in the dark	the same arrival window can turn from a photo slot into a night subject

Leisure flights: the most visible change

You notice the switch most clearly in vacation traffic. In summer, Mediterranean destinations shape the schedule of many German airports; leisure airlines like Condor or Discover Airlines and many low-cost carriers then fly their densest programs. A holiday airport like Palma de Mallorca Airport lives heavily on this seasonal rhythm. In winter the focus shifts to destinations with a mild climate – such as the Canary Islands – and to long-haul destinations. What the difference is between charter and scheduled traffic and why it often blurs today is explained in the article Charter vs. scheduled flights.

Long-haul: new visitors and pauses

Many airlines plan long-haul routes seasonally. Some routes exist only in summer, others only in winter, and the number of weekly flights can also change. For spotters this is the most exciting level, because new airlines, new types or rare models show up at the home airport here. When long-haul flights in Europe typically arrive and depart is summarized in the guide Long-haul arrival times in Europe.

Times: the hour that shifts everything

Europe changes its clocks, many other regions do not. If the departure time stays the same in a country without daylight saving time, the flight arrives an hour earlier or later in European local time after the switch. On top of that, in the southern hemisphere there are countries that change their clocks in exactly the opposite direction. The consequence for you: an arrival you have known by heart for months may lie in a different light window after the switch.

Light and schedule: the double change

The clock change affects not only flight times but also the clock time at which the sun is where you need it. After the change in October, the sun sets an hour earlier by the clock – and the days are getting shorter anyway. A long-haul wave in the late afternoon that still landed in warm light in late summer often arrives in twilight or darkness by November.

Conversely, winter brings advantages: the sun is lower, the light stays soft all day, and clear, cold air reduces heat haze over the asphalt. How to combine runway axis and sun position is explained in the guide Planning sun position. How to master cold, fog and short days is in Plane spotting in winter. And if a favorite flight comes at night in winter, Photographing aircraft at night will help.

A second point that is often forgotten: night flight restrictions stay tied to local time. If a route slips to the edge of the night curfew because of the clock change, that can affect an airline’s planning. Which rules apply at German airports is summarized in the article Night flight ban at German airports.

The weeks before the switch: your farewell list

With the end of a season, routes disappear – some only until next year, some permanently. For spotters, the last weeks before the key date are therefore a window of their own.

How to evaluate arrival and departure schedules for the spotting day is shown in the guide Using the departure and arrival board properly. Which runway is used at which wind is explained in Understanding runway direction in use at airports.

The weeks after the switch: new visitors, unfamiliar pictures

Hardly is the new schedule in force when the second exciting window begins. New routes have first flights, which at some airports are greeted with a water arch from the airport fire service. In the first days, airlines occasionally use different equipment than planned because rotations only settle in over time. And regulars suddenly come at new times – which regularly leads to surprises among spotters at the fence.

If you are specifically looking for rarities, Spotting rare aircraft offers strategies, and Finding special liveries explains how to track down special liveries in the new schedule. You set up alerts on flight tracker sites with the guide Flight tracking: setting up alerts.

Common mistakes around the schedule change

• Keeping old times in your head. The arrival you know by heart is often no longer correct after the switch. Recheck every favorite flight in the first week.
• Taking press releases literally. Announced routes can be postponed, shortened or flown with different equipment. What counts is what is on the arrivals board – and in the end, what actually lands.
• Forgetting the clock change when it comes to light. A spot that was perfect at 5 p.m. in September is often already in the dark at that time in November.
• Planning too late. If you only think of a farewell flight on the last weekend before the switch, you get just one attempt in autumn weather.
• Mistaking seasonal pauses for farewells. Many seasonal routes return in the next equivalent half-year. A farewell is only final when the airline or airport confirms it.

The schedule as part of your documentation

If you record your sightings, after a year or two you see the seasonal rhythm in black and white: which airlines came only in summer, which types were more frequent in winter, when a visitor’s last visit was. How to build a logbook that answers such questions is explained in Documenting sightings. Always note date, registration, type and airline – then you can later also trace how the traffic mix at your airport has changed over the seasons.

Conclusion

Summer and winter schedules are more than two timetable booklets. They form the framework in which airlines hold slots, plan routes and deploy aircraft – and they change in the same night as the clocks. For spotters, destinations, types, arrival times and light all shift at once. If you follow the announcements, work through a farewell list before the key date and check the new times after the switch, you turn the season change into two of the most exciting spotting phases of the year.