How Weather Affects Flights: Delays, Diversions and What to Expect
Quick answer
Weather affects flights mainly through visibility, wind, lightning and runway conditions, which force air traffic control to space aircraft further apart or pause operations. Most weather delays are measured in minutes to a few hours, but a knock-on effect can ripple through the whole day. Book earlier departures, allow generous connection times in storm or winter season, and watch your aircraft’s inbound flight for early warning.
Compare live fares on ScanFlyGo →
Why weather matters so much
Aircraft are built to cope with a lot, so weather delays are rarely about the plane itself being unable to fly. They are usually about capacity. Airports can only handle a certain number of take-offs and landings per hour, and bad weather shrinks that number. When fewer flights can safely use the runways, the rest wait on the ground or in the air.
Safety margins are deliberately large. Controllers increase the gap between aircraft when visibility is poor, crosswinds are strong, or a runway is wet or icy. Pilots and airline operations teams make their own go or no-go decisions on top of that.
The main weather culprits
| Weather | Typical effect |
|---|---|
| Fog and low cloud | Reduced landing rates; some aircraft or airports cannot land in very low visibility |
| Thunderstorms | Ground stops, rerouting around cells, ramp workers paused when lightning is close |
| Strong wind or crosswind | Runway changes, slower arrival spacing, occasional go-arounds or diversions |
| Snow and ice | De-icing queues, runway clearing, slower taxiing |
| Heat | Reduced aircraft performance at hot, high airports in some cases |
| Volcanic ash or dust | Airspace restrictions in rare events |
Why one storm delays flights elsewhere
Aircraft fly several legs a day. If your plane is stuck at a stormy airport in the morning, the delay can follow it to your departure in the afternoon even if the sky above you is perfectly clear. Crew duty-time limits add to the knock-on effect: crews who run out of legal hours cannot simply keep going.
This is why a delay can appear on your flight with no obvious reason. The cause is often upstream. Checking the live position of your inbound aircraft on the ScanFlyGo flight tracker shows you whether it is still on the ground elsewhere.
What the airline and air traffic control do
- Ground delay or ground stop: flights are held at their departure airport so aircraft are not circling at a congested destination.
- Rerouting: planes are steered around storm cells, adding minutes to the flight.
- Holding patterns: aircraft circle at altitude until a landing slot opens.
- Diversion: if conditions or fuel margins demand it, the flight lands at an alternate airport.
- Cancellation: airlines may consolidate or cancel flights to recover the schedule.
How to reduce your risk
Pick earlier flights
Morning departures have had less time to accumulate delays, and thunderstorms in many regions build through the afternoon. If you have a choice, an early flight gives you more room to be rebooked the same day.
Leave slack in connections
In winter or storm season, a tight connection is a bigger gamble. Allow more time, and keep the whole trip on a single ticket where possible so the airline is responsible for rebooking you.
Avoid the last flight of the day
If a late flight is cancelled, the next available seat may be tomorrow, and hotels near the airport fill up fast.
Prepare a small buffer kit
Keep essentials, medication, a charger and a change of clothes in your carry-on rather than checked luggage.
What to do when weather hits
- Check your airline’s app or website for waivers that allow free rebooking.
- Rebook online or through the app before joining a long desk queue.
- Keep receipts for meals and accommodation in case you can claim later.
- Ask what care the airline provides; rules differ by country and by cause.
Weather is generally treated as an extraordinary circumstance, which means cash compensation under rules such as EU261 is typically not owed for weather cancellations. The right to be rebooked or refunded, and in many cases to care while you wait, usually still applies in the EU. In other regions the rules differ, so check the airline’s contract of carriage.
Travel insurance and weather
Standard travel insurance may cover costs when severe weather disrupts your trip, but terms vary widely, and cover often needs to be bought before a storm is named. Read the policy’s definition of delay and the time threshold before benefits begin.
Frequently asked questions
Can a plane fly in heavy rain?
Yes. Rain alone rarely stops flights. Problems come from low visibility, lightning, strong wind or water on the runway that affects braking.
Why was my flight delayed when the weather looks fine?
The cause is often elsewhere: your aircraft may have been delayed at an earlier stormy airport, or air traffic control may be metering flights into a congested destination.
Do I get compensation for a weather cancellation?
Usually not cash compensation, since weather is generally an extraordinary circumstance. You are typically still entitled to rebooking or a refund, and sometimes care. Check the rules that apply to your flight.
Is turbulence caused by weather?
Often, yes. Storms, jet streams and mountain winds all cause bumps. Pilots route around the worst of it, and modern aircraft are built to handle it.
The bottom line
Weather delays are about airport capacity and safety margins more than about whether a plane can physically fly. You cannot control the sky, but you can fly earlier, build slack into connections and keep an eye on your aircraft’s journey. Track your flight live, browse popular routes, and search fares on ScanFlyGo when you are ready to book.
Some links on ScanFlyGo are affiliate links — we may earn a commission at no extra cost to you. Prices are examples found in recent searches and are confirmed at the partner’s checkout.