Keeping up with the country’s weed laws can be complicated, but the rules about flying with weed are simple: No matter your departure and arrival destinations, it’s still illegal to fly with marijuana. Yes, even when you’re flying between two states where marijuana is legal. That’s because marijuana possession still remains illegal under federal law, and when you fly, federal agencies are in charge.
And while we’re on the topic: You can bring vapes on board if they do not contain weed, unless your cartridge has less than 0.3 percent THC on a dry weight basis (at that point it’s considered a legal hemp product, not marijuana). However, vapes are not allowed in checked bags and must be transported in a traveler’s carry-on due to risks associated with their batteries. But remember, you can’t smoke or vape on a plane. Travelers who violate FAA vaping laws may face fines.