Cannabis on Domestic Flights in Thailand: PT 33 Rules 2026

You can fly with medical cannabis on domestic routes within Thailand — Bangkok to Chiang Mai, Phuket to Bangkok, any flight that takes off and lands on Thai soil — if you carry a valid PT 33 prescription. Without one, possessing cannabis flower is illegal anywhere in the country, airports included.

International flights are a different matter entirely. Carrying cannabis on any flight leaving Thailand is a serious criminal offence, whatever your prescription says and whatever the law says at your destination. That rule has no exceptions.

This guide covers the domestic rules as they stand in July 2026: the documents you need, how to pack, what enforcement looks like, and where each Thai airline stands — Bangkok Airways, Thai Airways, AirAsia Thailand, Nok Air, Thai Vietjet, and Thai Lion Air.

The Short Version

You can carry medical cannabis on domestic flights within Thailand if you hold a valid PT 33 prescription from a licensed Thai practitioner. Without that prescription, possessing cannabis flower is illegal, with commonly reported penalties of up to 25,000 THB in fines and three months in prison.

Pack it in your checked bag. Carry your prescription. Check your airline’s policy — two of the largest carriers ban cannabis outright. That covers about 90% of what most people need to know.

How We Got to This Point

When Thailand decriminalized cannabis in June 2022, the Airports of Thailand (AOT) confirmed that passengers over 20 could carry cannabis on domestic flights with essentially no restrictions. There was no weight limit. The only rule was the standard 100ml liquid restriction for carry-on items (Coconuts Bangkok, June 2022).

That changed on 26 June 2025, when a Ministry of Public Health notification signed by Public Health Minister Somsak Thepsuthin was published in the Royal Gazette with immediate effect, reclassifying cannabis flower as a controlled herb (สมุนไพรควบคุม) under the Traditional Medicine Act B.E. 2542 (1999) (The Nation, June 2025).

Cannabis flower was not returned to the narcotics list. It sits in a distinct legal category — controlled herb — which means different rules and different penalties than narcotics offences. One exception matters for travellers: cannabis and hemp extracts above 0.2% THC remain Category 5 narcotics under a separate regulation, a harsher regime than the controlled-herb rules covering flower. But the practical effect for everyone was immediate: you now need a medical prescription to legally possess cannabis flower anywhere in Thailand, including airports.

What You Need to Fly With Cannabis

A Valid PT 33 Prescription

The PT 33 form (ใบสั่งยา ปท. 33) is Thailand’s official medical cannabis prescription. It must come from one of seven categories of licensed practitioners, all of whom must hold cannabis-prescribing certification from the Department of Thai Traditional and Alternative Medicine (DTAM) (Tilleke & Gibbins, 2026):

1. Medical doctors
2. Thai traditional medicine practitioners
3. Applied Thai traditional medicine practitioners
4. Traditional Chinese medicine practitioners
5. Pharmacists
6. Dentists
7. Licensed folk healers

Each prescription is valid for a maximum of 30 days and is non-refillable. You need a new consultation for each new prescription. Foreign medical cannabis cards and prescriptions from other countries have no legal validity in Thailand (Terms.Law, 2026).

If you are a tourist, walk-in cannabis clinics in Bangkok, Chiang Mai, Phuket, and other major cities can issue a PT 33 in about 30 minutes. See our guide to choosing a cannabis clinic and our clinic directory. Flying out of the capital? Our medical cannabis in Bangkok guide covers getting a prescription there before your flight.

Your Purchase Receipt

Keep the receipt from your licensed dispensary. It provides a paper trail linking your cannabis to a legal purchase under a valid prescription. Some travellers also carry a photo of the dispensary’s licence on their phone, though this is not strictly required.

Packing: Checked Baggage vs. Carry-On

Put it in your checked bag. This is not a legal requirement, but it is a strong practical recommendation from AOT itself.

Here is why: cannabis carried through the security checkpoint in your hand luggage triggers an inspection by staff from the Narcotics Control Board (ปปส., Office of the Narcotics Control Board). AOT does not have the authority to verify THC percentages, so the ONCB gets involved. That means delays — potentially significant ones — while your products are tested or reviewed (Coconuts Bangkok, June 2022).

In checked luggage, your cannabis goes through standard screening without triggering the same inspection process.

Liquid Products

Cannabis in liquid form — tinctures, oils — follows the same 100ml carry-on restriction that applies to all liquids. If you are checking the bag, the 100ml limit does not apply, but the liquid must contain less than 0.2% THC unless it is covered by your PT 33 prescription.

Edibles and Extracts

This is where things get difficult. AOT has acknowledged that secondary cannabis products like edibles, hashish, and concentrated oils are problematic because airport security cannot test THC content on the spot. And the legal stakes are higher: extracts above 0.2% THC are Category 5 narcotics under the Narcotics Code, not controlled herbs. If your product contains more than 0.2% THC and you do not have a prescription covering it, you are taking a serious risk.

Flower with a valid prescription is the safest option for domestic travel.

CBD Products

CBD products with less than 0.2% THC do not require a prescription and can be carried on domestic flights without any special documentation. These are treated like any other legal consumer product.

Cannabis Policies by Airline: Thai Domestic Carriers

Thai law decides whether you may possess cannabis. The airline decides whether it flies. A valid PT 33 does not override a carrier’s conditions of carriage, and every airline operating in Thailand can ban cannabis from its aircraft — two of the largest do exactly that.

The positions below reflect what carriers had communicated when this guide was last updated in July 2026. Airlines change restricted-items rules without notice, so confirm on the carrier’s own dangerous-goods or restricted-items page within a few days of flying.

Bangkok Airways Cannabis Policy

Bangkok Airways is reported to prohibit cannabis products on its flights, including medical cannabis carried with a valid PT 33 — we could not verify this against a published conditions-of-carriage page, so confirm with the airline before flying. Any such ban is airline policy, not Thai law, and the airline is entitled to enforce it at check-in or at the gate.

This matters more than it might seem. Bangkok Airways operates Samui Airport, so if you are flying to Koh Samui, you are almost certainly flying Bangkok Airways. Plan to travel without cannabis and arrange your prescription and purchase on the island instead.

Thai Airways Cannabis Policy (Including Former Thai Smile Routes)

Thai Airways is reported to prohibit all cannabis products on its aircraft — checked or carry-on, flower or oil, prescription or not. We could not verify this against a published conditions-of-carriage page, so confirm with the airline; until you have that confirmation, the safe assumption is that cannabis is not allowed. If your domestic leg is on Thai Airways, leave cannabis behind.

A note on Thai Smile: the carrier no longer operates as a separate airline. Its domestic routes were absorbed into Thai Airways, and the same reported prohibition applies on every former Thai Smile route.

AirAsia Thailand Cannabis Policy

AirAsia Thailand is reported to permit medical cannabis on domestic routes for passengers carrying a valid PT 33 prescription and supporting documentation — which would make it the most accommodating major carrier for medical cannabis patients travelling within Thailand. We could not verify this against a published restricted-items page, so confirm with the airline in writing before you book.

Treat the permission as conditional, not casual. Pack flower in your checked bag, keep the PT 33 and dispensary receipt together, and arrive early enough to answer questions at check-in. Airline permission does not replace the legal requirements — the prescription still has to be valid on the day you fly.

Nok Air Cannabis Policy

Nok Air does not publish a clear cannabis-specific policy. Do not read silence as permission.

Before flying Nok Air with prescribed cannabis, check the airline’s restricted-items and dangerous-goods pages, then ask customer service in writing and keep the reply. If you cannot get written confirmation, book a carrier with a known policy or travel without cannabis.

Thai Vietjet Cannabis Policy

Thai Vietjet likewise has no published cannabis policy that we can point to. No cannabis-specific rule means the decision can fall to staff discretion on the day — a position you do not want to argue from at the gate.

The same drill applies: check the restricted-items page, request written confirmation before booking, and default to checked baggage with full documentation if you proceed.

Thai Lion Air Cannabis Policy

Thai Lion Air publishes no cannabis-specific policy either. Assume nothing.

If Thai Lion Air is your only option, contact the airline before booking, get any permission in writing, and carry your PT 33, receipt, and the written reply together. Otherwise, choose a carrier with a stated position.

Key point: an airline refusal is not a legal penalty, but it can mean surrendering your cannabis at the airport or being denied boarding. When policy is unclear, the conservative move always wins.

What Happens If You Get Caught Without a Prescription

Since the June 2025 regulatory change, the penalties depend on the specific offence — and the figures come from two different statutes, so keep them straight:

• Possessing cannabis flower without a valid PT 33: commonly reported penalties of up to 25,000 THB (roughly $700 USD) in fines and up to 3 months imprisonment (ThaiLawOnline, 2026)
• Smoking in public or creating a nuisance (the smell counts): fines up to 25,000 THB and/or up to 3 months under the Public Health Act B.E. 2535 (1992) — a separate offence that happens to carry the same headline figure
• Selling cannabis without a prescription (the shop’s offence, not the buyer’s): up to 1 year imprisonment and/or a 20,000 THB fine under the Traditional Medicine Act B.E. 2542 (1999) (Legal500, 2025)
• For foreign nationals: deportation and a criminal record that can affect future visa applications

Police have been actively checking prescriptions at airports, dispensaries, and popular tourist areas since the new rules took effect (AllAboutLawyer, 2026).

This is not theoretical. Enforcement is active and ongoing.

The One Rule That Has Not Changed: Never Fly International

Carrying cannabis on any international flight departing Thailand is a serious criminal offence. This was true in 2022 and it remains true now. The Food and Drug Administration has been unambiguous: importing “any cannabis or hemp, in any form” into or out of Thailand is forbidden.

It does not matter if cannabis is legal at your destination. The moment you cross an international border with Thai cannabis, you are committing a crime under both Thai law and likely the laws of your destination country.

This applies to connecting flights as well. If your itinerary involves an international leg, leave your cannabis behind.

Practical Checklist Before You Fly

1. Get your PT 33 prescription from a licensed Thai practitioner — budget 30 minutes at a walk-in clinic
2. Keep your dispensary receipt with the cannabis
3. Check your airline’s policy — Thai Airways and Bangkok Airways are reported to prohibit cannabis even with documentation (verify with the carrier)
4. Get written confirmation if flying Nok Air, Thai Vietjet, or Thai Lion Air — none publishes a cannabis policy
5. Pack cannabis in checked luggage to avoid ONCB inspection delays at security
6. Carry your PT 33 in your wallet or carry-on for easy access if asked
7. Keep liquids under 100ml if carrying cannabis tinctures in hand luggage
8. Never, under any circumstances, fly international with cannabis

Looking Ahead

Thailand’s Cannabis and Hemp Act (พ.ร.บ. กัญชา กัญชง) has still not passed. The Ministry of Public Health ran a formal public consultation on the draft from 22 April to 21 May 2026, and the government has said it wants the Act passed before the end of 2026, though that timeline is uncertain (DeeMED, June 2026).

Until then, ministerial regulations govern. Two landed this spring: the Category 5 extract regulation, effective 26 April 2026, and Ministerial Regulation No. 2 B.E. 2569 on controlled herbs, published in the Royal Gazette on 30 April 2026 (Juslaws, 2026). Both tighten licensing for cannabis businesses. Neither changed the rules for passengers carrying prescribed cannabis on domestic flights.

We will update this guide as the legal landscape develops. For the full picture on current regulations, see our Thailand cannabis laws 2026 guide.

Last verified: 20 July 2026. This article is for informational purposes only and does not constitute legal advice. Cannabis regulations in Thailand change frequently. Always verify current rules before travelling.