Flying Through Turbulence: Is It Dangerous?
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Edited by Adinda Irawan
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TL;DR: Turbulence rarely damages aircraft structurally but can seriously injure unbelted people — key advice is keeping your seatbelt on. Covers turbulence types, the SQ321 (2024) incident, and rising severe clear-air turbulence over the North Atlantic.
Is turbulence dangerous? The short answer
Turbulence is common, and it rarely damages an airliner. It does seriously injure people, mostly flight attendants and passengers who are not wearing a seat belt. FAA figures cited by National Geographic count 40 passengers and 166 crew members seriously injured by turbulence from 2009 to 2023. The one thing you control is simple: keep your seat belt fastened whenever you are in your seat.
One minute you are drinking your coffee, and the next your stomach drops. If you have driven over a speed bump, you already know the feeling. Turbulence is the same kind of bump, made by moving air instead of the road, and pilots fly through it all the time.
The plane is built for it. US certification rules set the gusts an airliner must withstand (14 CFR 25.341) and then add a 1.5 factor of safety on those limit loads (14 CFR 25.303).
What causes turbulence
Turbulence happens when the air a plane flies through moves unevenly. The US National Weather Service (NWS) describes these main types:
| Type | What causes it | Where and when |
|---|---|---|
| Clear-air turbulence | Moving air that is not linked to cumulus-type clouds or thunderstorms. It forms along jet-stream wind gradients, where wind speed changes sharply. | At or above 15,000 ft. It is not limited to cloud-free air, and conventional radar cannot detect it, so pilots cannot always see it coming. |
| Thermal turbulence | The sun heating the ground during the day. | Warm days, strongest at midday and in the afternoon. Calmer in the early morning and evening. |
| Mountain wave turbulence | Air flowing over mountain ridges forms eddies on the downwind side. | Downwind of mountain ranges. It can be some of the most severe turbulence from mechanical sources. |
| Thunderstorm turbulence | Air movement in and around thunderstorms. | Up to 20 miles from severe thunderstorms. The NWS calls it extremely hazardous, because it can overstress an aircraft or cause loss of control. |
| Wake turbulence | Spinning air left behind the wingtips of another aircraft. | Behind other aircraft. See the wake turbulence section below. |
The NWS list also includes wind shear, where wind speed or direction changes sharply over a short distance, and inversion turbulence, which can form at night after the ground cools. Storm flying has its own guide: can planes fly in thunderstorms.
Can turbulence bring down a plane?
Rarely. No official count was found, but a pilot who writes the Ask the Pilot column says jetliner crashes caused by turbulence can be counted on one hand. The usual harm is injury inside the cabin, not loss of the aircraft. In rare cases turbulence can overstress or damage an aircraft, most often in thunderstorms.
How strong airliners are built
Under 14 CFR 25.341, an airliner is designed against defined gusts, including a reference gust velocity of 56 feet per second (equivalent airspeed) at sea level, plus separate criteria for continuous turbulence. 14 CFR 25.303 then applies a 1.5 factor of safety: the structure must carry 1.5 times those limit loads. Extreme turbulence can still go beyond these loads and cause structural damage.
Singapore Airlines flight SQ321 (2024)
On 21 May 2024, Singapore Airlines flight SQ321, a Boeing 777-300ER flying from London to Singapore, hit severe turbulence and diverted to Bangkok. Singapore’s Transport Safety Investigation Bureau (TSIB) classified the event as an accident. Its preliminary findings show the vertical acceleration swinging about 1.5 G up and down within four seconds, while the aircraft lost about 178 ft. TSIB’s final report counts one passenger death, 56 serious injuries and 23 minor injuries. The Thai police certificate gave the passenger’s cause of death as heart failure and lung edema.
Who gets hurt
The NTSB’s 2021 safety study SS-21-01 looked at US airline (Part 121) operations from 2009 to 2018. Turbulence was the leading defining event in 37.6% of the accidents (111 of 295). Flight attendants were the most frequently injured group, and more than three-quarters of their injuries happened in the aft cabin.
Wake turbulence for passengers
Every aircraft leaves spinning air, called vortices, behind its wingtips. According to the FAA’s Aeronautical Information Manual, the strongest vortices come from an aircraft that is heavy, clean (flaps and landing gear up) and slow. For a following aircraft, the usual hazard is a roll that the wake induces. Structural failure is rare.
Pilots manage it by flying at or above the flight path of the aircraft ahead, and air traffic control keeps aircraft spaced apart. As a passenger, you will rarely feel it.
How pilots handle turbulence
Pilots actively manage turbulence to keep your flight as smooth as possible:
- They change altitude to find smoother air.
- They slow the plane to what pilots call turbulence penetration speed, a slower speed used for rough air.
- They change course to go around weather.
- They talk to air traffic control to get turbulence reports from aircraft ahead.
- They keep the seatbelt sign on when the air may be rough. US crews often leave it on longer after takeoff, according to the Ask the Pilot column.
- They keep you updated with announcements, so you know what to expect.
How to stay calm during turbulence
Feeling anxious? Start with the step that protects you, then the ones you can take in your seat:
- Buckle up and stay buckled. The FAA advises travelers to keep the seat belt fastened at all times when seated, even when the seatbelt sign is off, because turbulence can come without warning (FAA: Turbulence). In FAA Advisory Circular 120-88A (2006), only four belted occupants were seriously injured in turbulence from 1980 to 2003.
- Listen to the crew and follow their instructions.
- Remember that pilots handle turbulence every day and are trained for it.
- If you want a seat that may feel smoother, pilots and flight attendants often say the middle of the plane, over the wings, moves less than the back. That is their opinion; no study confirms it, and the difference may be small. Keep the belt on wherever you sit.
Where and when turbulence is more common
Turbulence depends on weather, jet streams and terrain, not on how busy the airspace or the airport is. These are the places and times where it is more likely:
- Jet-stream zones and the North Atlantic: clear-air turbulence forms along jet-stream wind gradients. A University of Reading study (Williams, Smith and Prosser, 2023) found that severe clear-air turbulence over the North Atlantic increased by 55% from 1979, and by 41% over the US (University of Reading; DOI 10.1029/2023GL103814).
- Mountain ranges such as the Rocky Mountains and the Andes, where mountain wave turbulence forms downwind of the ridges.
- Near thunderstorms, up to 20 miles from severe storms. Hurricanes are covered in our guide can planes fly over hurricanes.
- Warm afternoons: thermal bumps are usually weakest in the early morning and evening and peak in the afternoon on warm days. At night, turbulence can still come from temperature inversions after the ground cools.
Turbulence anxiety toolkit
- Keep your mind busy: watch a movie, use the in-flight entertainment, or chat with a friend.
- Prepare a playlist: download calming music or podcasts before you fly.
- Slow your breathing: deep, slow breaths can help calm your nerves. Some people use the 4-7-8 method (breathe in for 4 counts, hold for 7, breathe out for 8). This is general breathing advice, not a medical treatment.
- Know the numbers: airliners are built to defined gust criteria with a 1.5 factor of safety on limit loads (14 CFR 25.303 and 25.341).
- Pick your flight time: on warm days, early morning and evening flights usually meet weaker thermal bumps than afternoon flights.
Related guides and final thoughts
Turbulence is uncomfortable, but it is a normal part of flying. Airliners are built for it with a defined safety margin, pilots are trained for it, and most of the remaining risk falls on people who are not belted in. Keep your seat belt fastened and you have done the most useful thing a passenger can do.
Read our guides on can planes fly in thunderstorms and can planes fly over hurricanes, or see the safest airlines for 2025.
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Frequently Asked Questions
Is turbulence normal?
Yes. Turbulence is a common part of flying and rarely damages an airliner, but it does seriously injure people, mostly crew and passengers who are not belted in. FAA figures cited by National Geographic count 40 passengers and 166 crew members seriously injured from 2009 to 2023.
Can turbulence crash a plane?
Rarely. A pilot who writes the Ask the Pilot column says turbulence-caused jetliner crashes can be counted on one hand, though no official count was found. Airliners are built to defined gust loads with a 1.5 factor of safety, but extreme turbulence, most often in thunderstorms, can exceed those loads and damage an aircraft.
Are passengers always safe during severe turbulence?
No. On 21 May 2024, Singapore Airlines flight SQ321 hit severe turbulence, and TSIB’s final report counts one passenger who died (the Thai police certificate gave heart failure and lung edema as the cause) and 56 who were seriously injured. Keeping your seat belt fastened is the main protection.
Is turbulence worse at night?
Not as a rule. Thermal bumps are usually weakest in the early morning and evening and peak in the afternoon on warm days. At night, turbulence can still come from temperature inversions after the ground cools.
Are some planes better at handling turbulence?
No reliable source was found showing that one airliner model is smoother in turbulence than another. Whatever you fly, the protection is the same: keep your seat belt fastened whenever you are seated.
Where is the smoothest seat on a plane?
Pilots and flight attendants often say the middle of the plane, over the wings, is smoother than the back. No study confirms it and the difference may be small, so keep your belt on wherever you sit.
Is turbulence getting worse?
Severe clear-air turbulence is. A University of Reading study (Williams, Smith and Prosser, 2023) found it increased by 55% over the North Atlantic and 41% over the US since 1979; the study does not cover all types of turbulence.
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