Why do airplanes fly at around 35,000 feet?
Quick Answer
Airliners cruise around 35,000 feet because the air is thin enough to reduce drag but still high enough for efficient, safe operation. That altitude also helps aircraft avoid much of the weather.
The Full Story
At cruising altitude, the atmosphere is less dense, which lowers aerodynamic drag and improves fuel efficiency. Jets can therefore fly faster or farther for the same amount of fuel than they would lower down. The typical cruise altitude for many commercial flights is about 30,000 to 40,000 feet, with 35,000 feet being common. Flying higher also places planes above many clouds, storms, and turbulent lower-air weather. Aircraft still must remain below levels where cabin pressurization and engine performance become impractical.
Key Facts
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