Hii, I'm elizabeth wnickel. Whenever I travel on a plane, mostly people ask me about "can you take melatonin on a plane "and I always answer them with some basic key points which are beneficial for plane travellers ,It is generally allowed to take melatonin on a plane, but it's important to verify with your airline and the rules of your destination country. If you plan to carry melatonin with you, it's advisable to keep it in its original packaging and bring a doctor's note or prescription, particularly if you intend to bring a large quantity.