Help! How crucial is it to not fly within 24 hours of scuba diving?
I have a trip to the South Pacific coming up, and I’ve booked a 2 night 3 day dive trip out on a boat over the Great Barrier Reef. My last dive will be about 3pm on the day before I’m flying back to the US. My flight leaves at 6am, so I’ll have been 15 hours. Do you think that’ll be fine? I just want to make sure my head won’t explode or something, LOL!! Thanks in advance!! 
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PADI actually advocates at least 18 hours after a dive within NDL. Personally I stick to 24 hours myself, sometimes more but that’s for my dives beyond NDL..
If you keep it to a single no deco dive,stay well hydrated and don’t over exert yourself post dive, the 15 will probably work for you since DAN ( Divers Alert Network) suggests that 12 hours will be fine in that scenario.
Push that to multiple no deco dives or multiple dives over your last days at your destination and DAN sticks to it’s guns for an 18 hour no fly.
I’d be trying to get on an earlier charter if you can as a walk on perhaps. You probably will be in luck. Seems to me that charters always have no shows.
Please don’t take chances with your health and safety.
You should be able to use dive tables to calculate at what point it will be safe to fly if you know how many dives you’ll be doing, how deep you’ll be diving, how long you’ll be down, and what the surface interval will be between dives.
Some dive computers also have a “safe to fly” counter that will give you a number of hours you need to spend on the surface until it’s ok to get on a plane, but I think in your situation you need to know in advance.
My best advice: Call the charter company and ask to speak to the divemaster. I’m certain that they field this question all the time and they’ll know all the information above about the dives you’ll be doing, so they should be able to give you an accurate answer.