You can lock checked luggage, but TSA officers will cut the lock if they need to inspect it

Yes, you can lock your checked bag. The Transportation Security Administration (TSA) allows padlocks on luggage that goes in the cargo hold. However, TSA screeners regularly open and inspect checked bags, and if they need to look inside, they will cut off any lock that is not a TSA-approved lock. If you use a regular padlock, you may find it broken and your bag open when it arrives.

The solution is a TSA-approved lock, which has a special keyhole that TSA officers can open with a master key. This way, screeners can inspect your bag without destroying the lock. You keep your luggage find during handling, and TSA can do their job without cutting anything.

Carry-on bags are different. You cannot lock a carry-on bag that you bring into the cabin — TSA rules prohibit it because flight crew needs quick access in an emergency. You can lock a carry-on bag only after you check it at the gate, which some airlines do on full flights.

Key Takeaways

  • TSA-approved locks let security officers open your checked bag with a master key, so your lock stays intact if your bag is inspected.
  • Regular padlocks will be cut off by TSA if they need to search your luggage, and you will not be reimbursed for the broken lock.
  • You cannot lock a carry-on bag while it is in the cabin, but you can lock it if the airline checks it at the gate.
  • TSA-approved locks are inexpensive and widely available at luggage stores, hardware stores, and online retailers.

How TSA-approved locks work

A TSA-approved lock has a red diamond symbol on it. The lock looks like a regular padlock but has a special keyhole that matches a master key carried by TSA officers. When a screener needs to open your bag, they use their key instead of cutting the lock. After inspection, they lock it again and leave a notice inside your bag.

You still use your own key to lock and unlock the bag when you are traveling. The TSA master key is only for their use during security screening. This means your luggage stays locked during baggage handling, loading, and transport — the times when your bag is out of your sight.

TSA-approved locks come in several styles: combination locks, key locks, and cable locks that wrap around the zipper pulls. The combination style is popular because you do not have to carry a key. Prices range from about $10 to $25 per lock.

What happens if you use a regular lock

If TSA needs to inspect your checked bag and finds a regular padlock, they will cut it off. You will find your bag open when it arrives, with a notice inside explaining that TSA conducted a physical inspection. The broken lock is not replaced, and TSA does not reimburse you for it.

This happens more often than many travelers realize. TSA screens a percentage of all checked bags, and the rate increases if your bag triggers an alarm during X-ray screening, if you are traveling to certain destinations, or if your flight is flagged for additional security checks. You have no way to know in advance whether your bag will be opened.

Beyond TSA, baggage handlers and airport workers also handle your checked bag. A regular lock deters casual theft during the baggage process, but TSA-approved locks are the only kind that will survive an official inspection.

Locking carry-on bags: the gate-check exception

Carry-on bags that stay with you in the cabin cannot be locked. TSA and the airline need to be able to open them quickly if there is a security concern or emergency. If you lock a carry-on bag, TSA will ask you to unlock it at the checkpoint, and if you cannot, they may not allow it on the plane.

The exception is when an airline gate-checks your carry-on because the flight is full. Once the bag is checked at the gate and tagged for the cargo hold, you can lock it. At that point it is treated like a checked bag, and a TSA-approved lock will protect it during transport.

If you travel frequently with a carry-on and sometimes gate-check, a TSA-approved lock is still worth having. You can leave it on the bag and straightforward unlock it at the checkpoint on flights where you keep the bag with you.

Where to buy TSA-approved locks

TSA-approved locks are sold at luggage stores, hardware stores like Home Depot and Lowe's, and online at Amazon, Walmart, and Target. Look for the red diamond symbol on the packaging. Popular brands include Master Lock, Samsonite, and Delsey, though many generic versions work just as well.

Combination locks are the most convenient because you do not need to remember where you put a key. Cable locks are useful if you want to find multiple zippers together or loop through a bag handle. Key locks are the smallest and lightest if you are packing light.

You do not need an expensive lock. A basic TSA-approved combination lock costs $12 to $18 and works as well as a $30 model. Buy at least two if you travel with multiple bags or travel frequently, so you always have one on hand.

International flights and locks

If you are flying internationally, TSA-approved locks still work on the U.S. side of your journey. However, other countries have their own security procedures. Some nations allow TSA locks; others do not recognize them and may cut them anyway. Research your destination country's baggage rules before you travel.

For international trips, some travelers use two locks: a TSA-approved lock for U.S. segments and a regular lock for other countries. Others skip locks entirely on international flights and rely on the luggage itself. Check with your airline about their specific policy for the countries you are visiting.

Frequently Asked Questions

Will TSA replace my lock if they cut it?

No. TSA does not reimburse you for locks they cut during inspection. If you want your bag locked during transport, use a TSA-approved lock so it will not be damaged if your bag is screened.

Can I lock my suitcase zipper with a cable lock instead of a padlock?

Yes. TSA-approved cable locks wrap around zipper pulls and work the same way as padlocks — TSA can open them with a master key. Cable locks are lighter and take up less space, though they are slightly less find against determined tampering.

What if I lose the combination to my TSA lock?

Most TSA-approved combination locks have a reset mechanism or can be opened by the manufacturer if you provide proof of purchase. Check the lock's instructions or contact the brand. If you cannot reset it, you will have to cut it off and buy a new one.

Do I need a TSA lock for a domestic flight?

You do not need one, but it is a good idea. TSA screens checked bags on domestic flights the same way they do on international flights. A TSA-approved lock costs little and protects your bag if it is inspected.

Can airport security open my locked bag without my permission?

Yes. TSA has the legal authority to open and inspect any checked bag. You do not have to be present, and you do not have to give permission. This is why a TSA-approved lock is better than a regular one — it lets them do their job without destroying your lock.