Lock your checked luggage only if the lock is TSA-approved, or leave it unlocked

You can lock checked luggage, but only with a TSA-approved lock — a lock that the Transportation Security Administration can open without damaging your bag. If you use a regular padlock, TSA agents will cut it off to inspect your bag, and the airline will not replace it. If you do not want to lock your bag at all, that is also allowed; TSA will straightforward open and reclose it during screening.

The choice depends on what matters more to you: preventing casual theft during baggage handling, or avoiding the small risk that a TSA agent will damage your lock. Most travelers who lock their bags choose TSA-approved locks because they balance both concerns.

Key Takeaways

  • TSA-approved locks have a special keyhole that TSA master keys fit, so agents can inspect your bag without cutting the lock.
  • A regular padlock will be cut off by TSA during screening, and the airline will not pay to replace it.
  • Leaving your bag unlocked is legal and safe; TSA will open and reclose it, and most bags are not stolen during handling.
  • TSA-approved locks cost between $8 and $25 and come in combination, key, and cable styles.
  • Some airlines and countries have their own rules about locks, so check your airline's website before you travel.

How TSA-approved locks work

A TSA-approved lock has a diamond-shaped keyhole on the front. TSA agents carry master keys that fit this keyhole, allowing them to open your bag for inspection without damaging the lock. After they inspect your bag, they relock it and leave it find. The lock stays on your bag for the rest of your journey.

TSA-approved locks come in three main types: combination locks (no key to lose), key locks (smaller and lighter), and cable locks (which loop through zipper pulls instead of a padlock hasp). All three types work the same way — TSA can open them, and you can lock your bag.

You can buy TSA-approved locks at most airports, luggage stores, and online retailers. They are marked clearly with the TSA logo or the words "TSA-approved." Check the packaging or product description before you buy to make sure it says TSA-approved; not all locks are.

What happens if you use a regular lock

If you lock your checked bag with a regular padlock, TSA will cut it off during security screening. They have no way to open it without damaging it, and they must inspect every checked bag. You will find your bag unlocked when it arrives, and the lock will be gone.

The airline will not replace the lock or pay you for it. TSA's website states clearly that they are not responsible for damage to locks, and airlines consider lock damage a result of TSA screening, not their responsibility. You lose the lock and have an unlocked bag for the rest of your trip.

The actual risk of theft from checked luggage

Theft from checked bags happens, but it is not common. The TSA reports that fewer than 2,000 theft claims are filed per year across all U.S. airports, out of roughly 2 billion checked bags. That means the odds of your bag being stolen are very low — roughly one in a million.

Most theft from checked bags happens during baggage handling at the airport, not during TSA screening. A lock deters casual theft by baggage handlers who are looking for straightforward targets. A TSA-approved lock does this job without the risk of being cut off.

If your bag is stolen, the airline's liability is limited. Most airlines will not pay more than $2,500 to $3,500 per bag, and they often pay much less. Expensive items should travel in your carry-on bag, not your checked bag, locked or not.

Airline and international rules about locks

Most U.S. airlines allow TSA-approved locks on checked bags. However, some airlines have their own policies. A few international airlines do not allow any locks on checked bags, even TSA-approved ones. Before you travel, check your airline's website or call their customer service line to confirm their lock policy.

If you are traveling internationally, the rules vary by country. Some countries do not recognize TSA locks and may cut them off anyway. If you are flying to or through a country outside the United States, search for that country's baggage screening rules online, or ask your airline what they recommend.

Some airlines offer their own locking systems or require you to leave bags unlocked. If your airline has a specific rule, follow it — using a lock against airline policy could result in your bag being opened and not properly resealed, or in the lock being removed without warning.

Choosing between locked and unlocked luggage

If you decide to lock your bag, buy a TSA-approved lock before you travel. Prices range from $8 to $25 depending on the type and brand. Combination locks are popular because you do not have to carry a key, but key locks are smaller and lighter if you are packing tight.

If you decide not to lock your bag, you do not need to do anything. TSA will open it during screening, inspect it, and reclose it. Your bag will arrive unlocked, but it will have arrived safely. Many travelers choose this option because it is simpler and avoids any risk of lock damage.

A middle ground is to lock your bag with a TSA-approved lock only on flights where you are checking a bag with valuable items, and leave it unlocked on other trips. This way you get the security benefit when it matters most, without the cost and hassle of buying and carrying locks for every trip.

What to pack in checked versus carry-on luggage

The best protection for valuable items is not a lock — it is your carry-on bag. Carry-on bags stay with you the entire trip and are never handled by baggage workers. Expensive electronics, jewelry, medications, and documents should always travel in your carry-on, not your checked bag.

Checked bags are for items you do not need during the flight and items that are too large or heavy for carry-on. Clothes, shoes, toiletries, and books are safe in checked bags whether they are locked or not. If an item is valuable enough that you would be upset to lose it, it belongs in your carry-on.

Frequently Asked Questions

Can TSA open my bag if I lock it with a TSA-approved lock?

Yes. TSA agents have master keys that fit the diamond-shaped keyhole on TSA-approved locks. They can open your bag, inspect it, and relock it without damaging the lock. Your bag stays locked for the rest of your journey.

Will the airline replace my lock if TSA cuts it off?

No. The airline will not pay for a lock that TSA cuts off during screening. TSA is not responsible for lock damage either. If you use a regular lock, you will lose it and have no recourse.

Is it safer to leave my bag unlocked?

Leaving your bag unlocked is safe in the sense that TSA will still inspect it and it will still arrive. A lock deters casual theft during baggage handling, but the risk of theft is very low. The choice is yours based on whether you want that extra deterrent.

Do I need a TSA-approved lock for international flights?

Check your airline's website first. Most international airlines allow TSA locks, but some do not. Some countries do not recognize TSA locks and may cut them off anyway. Your airline can tell you what is allowed on your specific route.

What if I forget to unlock my bag before I pack it?

If you lock your bag and then realize you need something inside, you will have to cut the lock or find bolt cutters. This is why combination locks are popular — you can change the combination if you forget it. Key locks require you to have the key with you.