Rain alone rarely cancels a flight, but heavy rain combined with other weather can

Rain by itself is not usually enough to cancel a flight. Planes are built to fly in rain, and pilots train extensively to land and take off in wet conditions. Airlines and airports operate in rain routinely. What matters is not the rain itself, but what comes with it: lightning, wind gusts, poor visibility, or flooding on the runway.

A steady rain that reduces visibility to a few miles might delay a flight by 30 minutes while air traffic control spaces planes further apart. A thunderstorm with lightning will ground planes until the storm passes, because lightning poses a real risk to aircraft. Heavy rain that pools on a runway or taxiway can force a cancellation if the water is deep enough to damage engines or make braking unreliable.

The National Weather Service and the Federal Aviation Administration (FAA) set the visibility and wind thresholds that determine whether a runway stays open. These thresholds vary by airport and by runway — a large airport with modern equipment can operate in worse weather than a smaller one. When conditions fall below minimums, flights stop until weather improves.

Key Takeaways

  • Rain delays flights more often than it cancels them, and cancellations usually happen when rain brings lightning, strong wind, or flooding rather than rain alone.
  • The FAA and airport operators set visibility and wind limits for each runway; when weather drops below those limits, takeoffs and landings stop until conditions improve.
  • Thunderstorms with lightning ground all aircraft, even if rain is light, because lightning is the actual hazard.
  • Runway flooding from heavy rain can force cancellations if water is too deep for safe braking or engine operation.
  • You can check real-time weather and runway status on the FAA's website or your airline's app before heading to the airport.

How visibility limits work during rain

When rain falls, it reduces how far pilots and air traffic controllers can see down the runway. The FAA measures this as runway visual range (RVR), which is the distance a pilot can see the runway lights and markings from the air. Different runways have different minimums depending on the equipment installed and the type of approach the pilot is making.

A runway with older equipment might require visibility of half a mile or more. A runway with modern instrument landing systems (ILS) can operate safely with visibility as low as 600 feet — pilots rely on instruments rather than their eyes. When rain drops visibility below the runway's minimum, the FAA closes that runway to landings or takeoffs until visibility improves.

This is why two airports in the same rainstorm may have different delays. A major airport with multiple runways and modern ILS equipment can keep operating when a smaller airport with one runway and basic equipment has to stop. The rain is the same; the infrastructure is different.

Why thunderstorms cause cancellations even with light rain

Thunderstorms are the real reason rain leads to flight cancellations. A thunderstorm produces lightning, which is dangerous to aircraft. The FAA grounds all flights — both takeoffs and landings — when lightning is detected within a certain distance of the airport, typically 10 miles. This rule applies even if the rain at the airport itself is light.

Planes can be struck by lightning and survive; modern aircraft have lightning protection systems. But the risk is real enough that the FAA does not allow takeoffs or landings while lightning is active in the area. Pilots and ground crews wait for the storm to move away or weaken before operations resume. A thunderstorm that moves quickly might cause only a 20-minute delay; one that stalls over the airport can ground flights for hours.

Weather radar helps air traffic control predict where storms are moving. If a storm is forecast to pass through an airport in the next hour, controllers may hold flights on the ground rather than sending them into the air, where they would have to divert to another airport or circle and burn fuel waiting for the storm to clear.

Wind and rain together: when conditions become unsafe

Rain combined with strong wind is more likely to cause cancellations than rain alone. Wind affects how planes land and take off. Crosswinds — wind blowing across the runway rather than along it — have limits. Most commercial aircraft can land safely in crosswinds up to 15 or 20 knots, depending on the plane and the runway. Some smaller aircraft have lower limits.

When rain reduces visibility and wind gusts are strong, the combination can exceed safe operating limits. A pilot landing in heavy rain with 25-knot crosswinds faces both reduced visibility and difficulty controlling the aircraft. The FAA may close the runway or restrict operations to larger aircraft with higher wind ratings. If all available runways exceed wind limits, the airport may suspend operations until wind decreases.

Microburst winds — sudden, powerful downward winds that can occur near thunderstorms — are particularly dangerous. These can exceed 100 knots and can push a landing aircraft toward the ground or push a climbing aircraft down. When microbursts are detected by airport radar, all operations stop when ready.

Runway flooding and water damage

Heavy rain can pool on runways and taxiways if drainage systems are overwhelmed or if the airport sits in a low-lying area. Standing water on a runway creates two problems: it can damage jet engines if water is ingested during takeoff, and it can reduce braking effectiveness, making it harder for planes to stop.

Airport maintenance crews monitor drainage during heavy rain and may close sections of the runway if water accumulates. Once water is cleared — either by drainage or by crews with pumps and squeegees — the runway reopens. This type of closure is usually temporary and measured in minutes to an hour, not the whole day.

Flooding in taxiways (the paths planes use to move between the runway and the terminal) can also delay flights. Planes may have to use longer routes to avoid water, which slows down the sequence of takeoffs and landings. In extreme cases, if most taxiways are flooded, the airport may suspend operations until water recedes.

How to check if rain will affect your flight

Before you head to the airport, check the weather forecast for your destination and departure city. The National Weather Service website shows radar, current conditions, and hourly forecasts. Look for thunderstorms, heavy rain, or high wind warnings — these are the conditions most likely to cause delays or cancellations.

The FAA's website includes a tool called the Airport Status and Information System (ASIS), which shows real-time delays and closures at major airports. You can search by airport code and see whether delays are weather-related, how long they are expected to last, and whether any runways are closed. Your airline's app or website also displays current delays and may send notifications if your flight is affected.

If your flight is delayed or cancelled due to weather, the airline is not required to rebook you on another flight at no cost — weather is considered an act beyond the airline's control. However, most airlines will rebook you on the next available flight to your destination, either with them or with a partner airline. Check your airline's policy on their website or call them directly.

What happens to planes already in the air during rain

Planes already flying when rain or a thunderstorm develops are not grounded mid-flight. Pilots can request to land at their destination or divert to a nearby airport if weather is severe. Air traffic control will vector them to the safest landing option and may delay their descent if the destination airport is temporarily closed.

If a plane is on approach and weather suddenly worsens below landing minimums, the pilot will execute a missed approach — they climb back to altitude and circle or divert to another airport. This is routine and safe; pilots train for it constantly. Passengers may experience a longer flight and a later arrival, but the plane will land safely.

Planes waiting to take off at the gate are held there until weather clears. Crews do not push back from the gate if a thunderstorm is approaching or if visibility is too low, because once the plane is on the taxiway, it cannot easily return to the gate if conditions worsen.

Frequently Asked Questions

Will my flight be cancelled if it's raining when I arrive at the airport?

Not necessarily. Light to moderate rain does not usually cause cancellations. Check your airline's app or website for real-time flight status before you leave home. If your flight shows on time, it will likely depart, though it may be delayed. If a thunderstorm is forecast or already moving into the area, cancellations become more likely.

Can planes take off in heavy rain?

Yes, planes regularly take off in heavy rain. Pilots and aircraft are trained and equipped for it. Takeoffs are more likely to be delayed or cancelled if heavy rain is accompanied by lightning, strong wind, or if it reduces visibility below the runway's minimum operating limits.

What's the difference between a delay and a cancellation?

A delay means your flight will depart later than scheduled but will still fly. A cancellation means the flight will not operate that day. Weather delays can last from 30 minutes to several hours. Cancellations usually happen when weather is forecast to remain unsafe for the entire day or when the airline cannot operate the flight profitably after a long delay.

If my flight is cancelled due to rain, do I get a refund?

Weather is considered an act beyond the airline's control, so you are not may have access to to a cash refund under most airline policies or U.S. law. The airline will rebook you on the next available flight at no additional cost. If you prefer not to fly, you can request a travel credit or, in some cases, a refund — check your airline's specific policy.

How long does a weather delay usually last?

Weather delays vary widely. A passing rain shower might delay a flight 15 to 30 minutes. A thunderstorm can ground flights for an hour or more. A major weather system can cause delays of several hours or lead to cancellations. Check the FAA's Airport Status tool or your airline's app for current estimated delays at your airport.