What happens if you fly after scuba diving?
Ascending to high altitude after scuba diving increases your risk of suffering from decompression sickness. Flying after diving increases this risk because of the decreasing atmospheric pressure.
What not to do after scuba diving?
Firstly, and probably most importantly, you should not fly after scuba diving. The general rule is considered to be that you should wait a minimum of 12 hours after one no-decompression stop dive, or 18 hours after two or more. Some people like to wait 24 hours, just to be safe.
Is it OK to scuba dive before flying?
Both PADI and DAN recommend a minimum preflight surface interval of at least 12 hours for single dives and 18 hours for repetitive dives or multiple days of diving. The US Air Force recommends 24 hours after any dive, while the US Navy tables recommend only 2 hours before flying to altitude.