Rain alone usually does not delay flights

Most rain does not stop planes from taking off or landing. Commercial aircraft are built to fly and land in rain, and pilots train specifically for wet conditions. A light or moderate rain shower will not change your flight time.

What matters is not the rain itself but what comes with it: wind speed, visibility, lightning, or the combination of all three. A thunderstorm with heavy rain, strong gusts, and lightning will ground flights. Steady rain with calm winds will not.

Airlines and the Federal Aviation Administration (FAA) use specific weather thresholds to make delay decisions. If conditions stay within those limits, your flight departs on schedule.

Key Takeaways

  • Light or moderate rain alone does not delay flights; aircraft are designed and maintained to operate in wet conditions.
  • Thunderstorms with lightning, wind gusts over 30 to 40 miles per hour, or visibility below 3 miles will trigger delays or cancellations.
  • Wind is often the real reason for a rain delay, not the rain itself — crosswind limits vary by aircraft type and runway.
  • Ground stops can last 30 minutes to several hours depending on how fast the storm moves through the airport.
  • You can check real-time weather at your departure and arrival airports on the FAA website or your airline's app to predict delays before they happen.

When thunderstorms trigger ground stops

Thunderstorms are the weather event most likely to delay your flight. The FAA issues a ground stop when lightning is within a certain distance of the airport — typically 10 miles. During a ground stop, no planes take off or land until the storm passes far enough away.

A ground stop can last 30 minutes or several hours, depending on how fast the storm moves. If the storm stalls over the airport, delays stack up quickly because planes already in the air have to hold and wait for clearance to land, and planes on the ground cannot push back from the gate.

The FAA also watches for heavy rain that reduces visibility below 3 miles, hail, or wind gusts that exceed the limits for your specific aircraft and runway. A Boeing 737 can handle crosswinds up to about 33 miles per hour, but a smaller regional jet may have a lower limit. If gusts exceed that threshold, the airport stops departures until conditions improve.

Wind is often the real culprit in rainy weather

When an airline says a flight is delayed due to weather, the rain may be falling, but the wind is usually the problem. Crosswind — wind blowing across the runway rather than along it — is what pilots cannot tolerate. A 40-mile-per-hour crosswind is dangerous; a 40-mile-per-hour headwind is manageable.

Thunderstorms bring both heavy rain and strong, unpredictable gusts. A pilot may be cleared to land, then encounter a sudden wind shear that forces them to abort the landing and circle again. Multiple aborts back up the entire airport.

Runways are oriented in specific directions. If the wind is blowing perpendicular to the runway, the airport may have to switch to a different runway that aligns better with the wind direction. That switch takes time and disrupts the landing sequence.

How visibility affects landing decisions

Heavy rain can reduce visibility to the point where pilots cannot see the runway clearly enough to land safely. The FAA sets minimums based on the type of landing equipment the aircraft has. A plane with modern precision landing systems can land in lower visibility than an older aircraft.

If visibility drops below the minimum for your aircraft type, the airport issues a ground stop for arrivals. Departures may continue if visibility is acceptable for takeoff, which usually has a higher threshold than landing.

Fog mixed with rain is particularly problematic because it reduces visibility faster than rain alone. An airport that can handle a rainstorm may not be able to handle the same rain with fog.

How long rain delays typically last

A brief rain shower with no wind or lightning may cause a 15 to 30-minute delay while the airport clears the runway of standing water and pilots adjust to wet conditions. A moderate thunderstorm usually causes a 1 to 2-hour delay. A severe storm system can ground flights for 3 to 6 hours or longer.

The delay depends on how fast the weather moves. If a storm is moving at 30 miles per hour and is 20 miles away, it will reach the airport in about 40 minutes. If it stalls, delays extend. If it weakens as it approaches, the airport may reopen sooner than forecast.

Airlines post updates as conditions change. Check your airline's app or website for the most recent estimate rather than relying on the original delay time.

What you can do when rain delays your flight

Check the real-time weather radar and lightning data for your departure and arrival airports before you head to the airport. The FAA provides live weather information at aviationweather.gov. Your airline's app usually shows current conditions and delays.

If a thunderstorm is forecast for your departure time, expect a delay. If the storm is already moving away from the airport, delays should clear within the hour. If the storm is intensifying, prepare for a longer wait.

Once you are at the airport, ask the gate agent for updates every 30 minutes. Weather can change quickly, and the airline's estimate may shift. If your flight is cancelled due to weather, the airline is not required to pay compensation, but you have the right to a rebooking on the next available flight at no extra cost.

Rain delays at your destination airport

Your flight can be delayed not because of weather at your departure airport but because of weather where you are landing. If a thunderstorm is over your destination, your plane may be held on the ground until the airport reopens.

This is called a ground delay program (GDP). The FAA tells airlines how many planes can land per hour, and flights are released from their origin airport in a staggered sequence. A GDP can add 1 to 4 hours to your flight time.

You will see this delay listed as "weather at destination" or "air traffic control delay" on your airline's system. There is nothing the airline can do to speed it up; the airport must reopen before planes can land.

Frequently Asked Questions

Can planes take off in heavy rain?

Yes, if visibility is acceptable and there is no lightning or excessive wind. Heavy rain alone does not stop takeoffs. The pilot needs to see the runway clearly enough to navigate, and the aircraft needs enough runway length to reach takeoff speed in wet conditions, which requires slightly more distance than in dry conditions.

Why do some airports delay flights for rain that other airports do not?

Runway design, length, and orientation matter. Some airports have longer runways, which means planes can take off safely in conditions that would be marginal at a shorter airport. Airports also differ in their precision landing equipment. An airport with older systems may have higher weather minimums than a newer one.

Does drizzle cause delays?

Drizzle alone does not cause delays. Planes operate normally in light rain and drizzle. Delays happen when drizzle combines with fog, wind, or lightning, or when it is so heavy that visibility drops below minimums.

What is the difference between a delay and a cancellation due to rain?

A delay means the flight will depart or arrive late but will still operate. A cancellation means the flight will not operate at all. Cancellations happen when weather is so severe that conditions are not expected to improve within a reasonable time, or when the weather has already caused such a backlog that the airline cannot recover the schedule.

Will my flight be delayed if it is raining when I land?

Not necessarily. If the rain is steady but light, visibility is good, and there is no wind or lightning, you will land on time. If the rain is part of a thunderstorm or is so heavy that visibility drops, you may circle and wait, or you may be diverted to another airport.