Understanding runway direction in use at airports: wind, runways and what it means for your spot

You are standing at the approach with a full battery, the clouds are perfect – and the aircraft are landing at the other end of the airport. Almost every spotter knows this day. The reason is almost always the same: the runway direction in use has changed because the wind has turned. If you understand how wind, runways and runway direction in use are connected, you no longer plan your spot by gut feeling but by weather report. This guide explains the logic behind it, shows how to read runway numbers and weather reports, and how to turn all of it into a concrete spotting plan.

Runway direction in use: the short answer

The runway direction in use tells you which direction aircraft are currently taking off and landing at an airport. It depends first and foremost on the surface wind: aircraft prefer to lift off into the wind and touch down into the wind. If the wind comes from the west, takeoffs are made to the west, and landings come in from the east. If the wind turns to the east, the whole picture reverses – approaches, departures, taxiways, often also the side of the airport where you get good photos.

The runway direction in use is named after the runway number. “Runway direction 25” means: takeoffs and landings are made on the runways designated 25, so roughly toward west-southwest. The opposite direction is then called 07.

Why into the wind?

What counts for an aircraft at liftoff is not the speed over the ground but the speed relative to the surrounding air. Only that creates lift. If a headwind blows against the aircraft, it has already been “given” part of the required airspeed while standing still. It therefore needs less runway, lifts off earlier and climbs more steeply after takeoff. On landing the same applies in reverse: a headwind lowers the groundspeed, and the aircraft comes to a stop in a shorter distance.

A tailwind does the opposite. It lengthens the takeoff roll and landing rollout and worsens the climb. It is not completely prohibited, but the permitted values are small. A crosswind, in turn, is mainly a question of the limits of the particular aircraft type and pilot technique – for the choice of runway direction, what matters first is whether the component along the runway comes from ahead or from behind.

For you as a spotter this has a nice side effect: in strong crosswinds you see the typical crabbed approaches, where the nose is turned into the wind before touchdown. These photos only happen on days when the wind is clearly across the runway.

Reading runway numbers like a compass

Every runway carries a large number at both ends. It is nothing other than the magnetic heading of the runway in degrees, rounded to ten and divided by ten. A runway pointing to 254 degrees becomes 25. The other end points exactly in the opposite direction, so 180 degrees further – that is why the numbers always differ by 18: 07 and 25, 08 and 26, 05 and 23.

For parallel runways a letter is added: L for the left, R for the right and C for the center runway, each from the pilot’s point of view in the direction of flight. Because the point of view reverses when the direction changes, the left runway becomes the right one at the other end. In Munich the north runway is therefore called 08L/26R and the south runway 08R/26L.

Runway number	Approximate heading	Wind fits if it comes from …	Example
05 / 23	northeast / southwest	northeast or southwest	Düsseldorf
07 / 25	east-northeast / west-southwest	east or west	Frankfurt (parallel runways)
08 / 26	east / west	east or west	Munich
14 / 32	southeast / northwest	southeast or northwest	Zurich
18	south	special case: takeoff-only runway to the south	Frankfurt, Runway 18 West

The most important mental step here: Wind directions are always given as the direction the wind comes from. “Wind from 250 degrees” blows from west-southwest to east-northeast. For an aircraft rolling toward 250 degrees on runway 25, that is exactly a headwind. The rule of thumb is therefore: the runway number closest to the wind direction (divided by ten) is the likely runway direction in use.

Headwind, tailwind, crosswind: the calculator

The wind almost never comes exactly from the runway direction. What matters is therefore the component along the runway. It depends on the angle between wind and runway: if the wind is exactly on the axis, it acts fully as headwind or tailwind; if it is across, the along-runway component is zero.

Why the direction doesn’t change immediately

Changing the runway direction is laborious for air traffic control and the airport: approach routes, departure routes and taxiways have to be switched, and capacity drops during the changeover. A direction is therefore often kept as long as the tailwind stays low. For Frankfurt, the city’s aircraft noise reports describe that a runway direction may be maintained up to a tailwind component of 5 knots; only above that is it changed.

For you, this means: with light, shifting wind, looking at the wind direction alone is not enough. A light easterly wind of a few knots may not yet flip the direction at an airport that is currently operating westward. Only when the wind freshens is the switch made – often in the middle of the morning, exactly when you are already standing at the fence.

Three airports, three logics

The basic rule applies everywhere, but practice differs considerably. Three examples from the German-speaking region show the range.

Frankfurt works with four runways: three parallel runways in an east-west direction (07/25) and Runway 18 West, which is used only for takeoffs to the south. The Northwest Runway is used exclusively for landings. According to the City of Frankfurt’s aircraft noise protection office, the long-term ratio is around 70 percent westerly and 30 percent easterly runway direction; in individual quarters, west can dominate even more clearly. With runway direction 25, landings come in from the east over southern Frankfurt, with 07 from the west. You will find more about the airport in the profile of Frankfurt Airport.

Munich has two parallel runways in an east-west direction, the north runway 08L/26R and the south runway 08R/26L. The logic is therefore straightforward: westerly wind means runway direction 26, easterly wind 08. The visitors’ hill at Munich Airport (Besucherhügel) lies between the two runways and can therefore be used in both directions – only the approach and takeoff phases swap sides. Background on the airport is provided by the profile Munich Airport.

Zurich shows that wind is not everything. The airport has three runways and, according to its own spotter information, works with fixed concepts by time of day: in the early morning the south concept applies with landings on runway 34, during the day the north concept with landings on 14 and 16, in the evening the east concept with landings on 28. The weather decides whether a concept is possible: in westerly wind the east concept can also run during the day, and in bise (a cold northeasterly wind) takeoffs are additionally made to the east on runway 10. Without a look at the time and day of the week, you plan into the void in Zurich. More on this in the profile Zurich Airport.

Reading the wind: forecast, METAR and live map

Three sources are enough to estimate the runway direction in use reliably. Each answers a different question.

• Wind forecast (days ahead): It tells you whether westerly or easterly wind is more likely on the planned day. Look at the surface wind at the airport, not winds aloft, and at the strength: in light wind, the prediction of the runway direction is less certain.
• METAR (current state): The airport’s routine weather report is generally issued every half hour or hour. The wind group usually follows directly after the location identifier and time. “24012KT” means wind from 240 degrees at 12 knots, “24012G25KT” additionally gusts up to 25 knots, “VRB03KT” light wind from a variable direction.
• Live map (confirmation): On a flight tracking map you see which direction aircraft are currently approaching from. That is the quickest cross-check before you set off. How these maps get their data is explained in the guide to Flight tracking and ADS-B for spotters.

Some airports also display the current runway direction in use directly on their website or in aircraft noise portals. This information is usually the most reliable snapshot.

From runway direction to spot plan

With knowledge of wind and runways, every spotting day can be planned in a few steps.

Step five is the one many people underestimate. Runway direction and light direction are connected: a spot on the south side of an east-west runway has the sun in your face at midday, a spot on the north side at your back. How to plan azimuth and sun elevation for your location is shown in the guide Planning sun position at the photo spot.

When the runway direction doesn’t fit

Sometimes the wind simply doesn’t cooperate. Then you have three options.

Observation decks are often the more relaxed choice. From the visitor terrace at Düsseldorf Airport you see the apron and both parallel runways, no matter whether aircraft operate toward 05 or 23 – for frame-filling takeoffs and landings, though, you need a telephoto lens. And no matter where you move to: stay on public ground. What is allowed at the fence and what is not is summarized in the article Is plane spotting allowed?

What to keep in mind

• Don’t confuse the direction the wind comes from. Wind “from the west” means takeoffs to the west. The most common mistake is reversing the direction.
• Take light wind seriously. Below a few knots, noise abatement and the airport’s preferred direction decide, not the wind. Forecasts are then less certain.
• Watch for gusts. A mean wind of 8 knots with gusts over 20 can tip the situation over the course of the day.
• Know local concepts. At airports with noise abatement rules by time of day, like Zurich, the time is as important as the wind.
• Allow for construction work and closures. If a runway is being resurfaced, distribution and approach paths change – airports usually announce such work in advance.
• Keep your own notes. Write down which spot worked in which wind. After one season you know your home airport better than any rule of thumb.

Conclusion

The runway direction in use is no coincidence but physics plus a few rules. Aircraft want headwind, the runway number reveals the direction, and the wind forecast tells you which number applies tomorrow. On top of that come local quirks: tailwind tolerances that delay a change, and runway concepts that matter more than the wind at some airports. If you bring it all together and compare it with sun position and live map, you spend a lot more time with good subjects and less time relocating. If you are just starting out, you will find the other basics in the guide Plane spotting for beginners.