Can you fly with weed? What TSA, Canada and the law actually say

Can you bring weed on a plane in the US?

No. Marijuana is a controlled substance under US federal law, and a state legalizing it does not change that. US Customs and Border Protection, in a statement last updated in 2023, puts it in one sentence: although medical and recreational marijuana may be legal in some US states and Canada, it remains illegal under United States federal law. Airport security is run by a federal agency, TSA, and federal law applies at every airport, in every state.

The legal states we checked say the same thing. Colorado's public health department tells people to keep it in Colorado: leaving the state with any cannabis product is against the law, and you cannot bring cannabis to Denver International Airport or any other airport. That covers flower, pre-rolls, carts and gummies, in a carry-on or a checked bag, on a flight to another legal state or within Colorado.

Does TSA care about weed?

TSA's own page on medical marijuana says "Yes (Special Instructions)" for both carry-on and checked bags, which confuses a lot of people. The instruction is this: TSA's screening is focused on security and designed to detect threats to aviation, so officers do not search for illegal drugs, but if any illegal substance is discovered during screening, TSA refers the matter to a law enforcement officer.

So TSA is not hunting for your weed. It is looking for weapons and explosives. But bags get opened for ordinary reasons, a bottle of water, a laptop, a dense shape on the X-ray, and once a bag is open, that referral rule applies. What happens next depends on the state the airport is in and on the officer, and nobody can promise you an outcome. Some people are told to throw it out, some get a citation, some are arrested. That uncertainty is the real risk.

What happens if TSA finds weed in checked luggage?

The same thing. TSA's statement covers both carry-on and checked bags, and checked bags are screened and opened too, usually without you there. If something is found, the matter goes to law enforcement. The one difference is that you may not learn about it until later. A checked bag is not a safer place for it, just a slower way to find out.

Can you bring a weed pen or cart on a plane?

Two separate rules apply, and people mix them up. The first is about the device. TSA allows electronic cigarettes and vaping devices only in carry-on baggage, never in a checked bag, sets limits on their lithium batteries, and asks you to take steps so the heating element cannot switch on by accident. That rule covers any vape pen, whatever goes in it.

The second rule is about what is in the cart. THC oil is marijuana under federal law, so a loaded cart is in the same position as flower. The battery rule tells you where the device has to go. It does not make the oil legal. In Canada, a cart counts toward the possession limit like any other cannabis product.

Can you fly with edibles or gummies?

In the US, no, for the same federal reason. Gummies are still a THC product, and if an officer finds them the referral is the same. In Canada, edibles are legal to carry on a domestic flight within the possession limit.

Can you fly with medical marijuana?

It is a gray area, not a green light. In April 2026 the federal government moved marijuana covered by a state medical license to Schedule III, a less strict category than recreational marijuana, but it is still a controlled substance, and the rule says nothing about flying with it. TSA's medical marijuana page still says that if an illegal substance turns up, TSA "will refer the matter to a law enforcement officer," and CBP's statement, last updated in 2023, says medical marijuana is illegal under federal law. A card may matter to the local officer you are handed to, in a state that recognizes it, but it is not permission to fly with cannabis, and it means nothing at a border or in a state that does not recognize it. If you rely on cannabis as medicine, ask your doctor about a plan for the trip rather than a plan for the checkpoint.

Can you fly with weed in Canada?

Yes, on flights inside Canada. Under the Cannabis Act, adults can possess up to 30 grams of dried cannabis, or the equivalent in other forms, in public, and the Canadian Air Transport Security Authority (CATSA) lists cannabis as allowed in both carry-on and checked baggage. A few details from CATSA's page:

• Liquid and topical cannabis in your carry-on follows the normal liquids rule: containers of 100 ml or less, in the 1-liter clear bag.
• Medical cannabis oil over 100 ml is permitted in carry-on, but you must take it out and present it to the screening officer at the start of screening, and the amount you carry must follow the medical cannabis regulations.
• You are responsible for the rules at your destination within Canada. Provinces set their own rules on where you can use it.

Keep it in its original packaging and keep the total under 30 grams. Our weed measurements guide shows what that looks like (30 grams is a little over an ounce). And note the last line on CATSA's page: flying outside of Canada with cannabis is illegal.

Can you fly internationally with weed?

No, in any direction, and this is the part with real consequences. The Government of Canada's rule: unless authorized by Health Canada and the authorities of every country you pass through, it is illegal to take cannabis, including any product containing cannabis, across the Canadian border, whether you are entering or leaving. It applies to any amount, to medical cannabis, to CBD products, and even when you are flying to or from a place where cannabis is legal. Under the Cannabis Act, taking it across the border carries up to 14 years in jail. The same travel page warns that arriving in another country, including the United States, with any amount could mean a criminal charge and being denied entry in the future.

On the US side, CBP says crossing the border or arriving at a port of entry with marijuana may result in seizure, fines, arrest, and can affect whether you are admitted. Other countries can be stricter. The US State Department's advisory for The Bahamas, a short flight from Florida, says marijuana and all products that contain its derivatives, including CBD, are not legal there. If you remember one line from this page: nothing with THC or CBD crosses a border with you.

Before you fly: a short checklist

1. Decide at home, not at the airport. In the US, leave it behind. Give it to a friend or dispose of it. Buying at your destination, where it is legal, beats carrying anything.
2. Check your bags, pockets and jackets. The classic mistake is a forgotten grinder, a half-smoked joint in a coat pocket, or a pen in a backpack. Empty the travel bag completely before you pack it.
3. Inside Canada, keep it simple. Under 30 grams total, original packaging, liquids in the clear bag, and check the rules where you land.
4. Never carry it across a border. Not into the US, not into Canada, not to a beach resort, not with a medical card.
5. Put the pen in your carry-on. If you are bringing a battery device at all (empty, or inside Canada), it goes in carry-on, never checked.

Common questions