How high can you fly without oxygen?

For Part 91 General Aviation operations the required flight crew must use supplemental oxygen for any portion of the flight that exceeds 30 minutes above a cabin pressure altitude of 12,500 feet mean sea level (MSL) up to and including 14,000 feet (MSL).



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In aeronautics, hypoxia typically results from a decompression or lack of pressurisation of the aircraft cabin. Hypoxia occurs within a few minutes if the cabin pressure altitude rises to between 5,000-6,000 m (about 16,000 - 20,000 ft).

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The highest certified altitude of an airliner was Concorde's 60,000 feet. Today some of the corporate jets can fly at 51,000 feet. Q: What is the highest cruising altitude allowed? A: Most airliners are limited to 45,000 feet or less.

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Basically, turbulence is unpleasant, but you it will not cause your plane to crash: the safe-proofing for commercial flights is such you simply can't fly when it is too rough out.

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Routes with the most turbulence
  • New York to London. One of the most popular routes which experience turbulence is flying from New York to London (and also London to New York). ...
  • Seoul to Dallas. ...
  • Flying into certain airports near the equator. ...
  • Flying into Reno, Nevada. ...
  • London to South Africa.


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The air on a plane contains less oxygen than the air we normally breathe in. This leads to lower levels of oxygen in the blood. If you do not have a lung condition, the drop in oxygen is not enough that you would feel the difference.

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Answer: No. The cabin is pressurized between 6,000 and 8,000 feet on long flights. Adding supplemental oxygen is not necessary, because the percentage of oxygen is the same as being on the ground at those altitudes. Question: Why can't airplane vents go into recirculation mode like an automobile?

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Depending on the altitude of the aircraft when depressurisation takes place, loss of pressurisation can very quickly lead to the incapacitation of the crew and passengers unless they receive supplementary oxygen.

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