Most airlines allow locks on checked bags, but TSA officers can cut them open without permission

You can lock your checked luggage on most airlines, but the lock will not stop a TSA (Transportation Security Administration) officer from opening your bag during screening. If an officer needs to inspect your bag, they will cut the lock if necessary — you will not be charged for the damage, but your lock will be destroyed. The TSA does not require you to unlock your bag for them; they straightforward proceed with cutting if you are not present to open it.

Some airlines have their own rules on top of the TSA rule. Most major carriers — including American, Delta, United, and Southwest — permit locks on checked bags. A few regional or international airlines may restrict locks entirely, so check your airline's baggage policy before you pack. The safest approach is to use a TSA-approved lock, which has a special keyhole that TSA officers can open with a master key without damaging the lock.

Key Takeaways

  • TSA officers can cut any lock on a checked bag to inspect it, and you will not be charged for the damage.
  • A TSA-approved lock lets officers open your bag with a master key instead of cutting the lock.
  • Most major U.S. airlines allow locks on checked luggage, but some international carriers do not — verify your airline's policy before you travel.
  • If you use a regular lock and your bag is inspected, expect the lock to be destroyed and your bag to show signs of opening.

How TSA-approved locks work

A TSA-approved lock has a red diamond symbol on it and a keyhole that matches a master key held by TSA officers. When an officer needs to inspect your bag, they can open the lock, examine the contents, and lock it again — all without cutting it. Your lock stays intact and usable for the rest of your trip.

TSA-approved locks cost between $10 and $25 and are sold at most luggage shops, travel retailers, and online. They come in padlock form (for zippers) and combination lock form (for hard-sided luggage). If you travel frequently, one lock pays for itself the first time it prevents your regular lock from being cut.

What happens if you use a regular lock

If you lock your bag with a standard padlock or combination lock and the TSA needs to inspect it, the officer will cut the lock. You will not receive compensation or a replacement lock. Your bag will be reopened, and you will see evidence that it was inspected — usually a notice card left inside.

This is not a punishment or a sign that something is wrong. TSA screening is random, and many checked bags are never opened. But if yours is selected, a regular lock straightforward cannot stop the inspection from happening.

Airline-specific lock policies

Most U.S. airlines permit locks on checked bags. American Airlines, Delta, United, Southwest, JetBlue, and Alaska Airlines all allow them. However, some international carriers — particularly airlines based in Europe or Asia — prohibit locks entirely or require bags to be unlocked during check-in.

If you are flying internationally or with a carrier you do not recognize, check the airline's website under baggage rules or call their customer service line. The policy is usually listed under "checked baggage" or "security." If locks are prohibited, you will need to pack your bag without one or use a TSA-approved lock that the airline specifically permits.

Locks on carry-on bags

Locks on carry-on luggage are not screened by the TSA in the same way. You can lock a carry-on bag, and TSA officers will not cut the lock to inspect it — they will ask you to open it. If you refuse, you may be denied boarding or your bag may be confiscated.

Most travelers do not lock carry-on bags because you need quick access to your items during the flight, and TSA screening happens before you board. A lock on a carry-on is more of a hassle than a protection.

Where to buy TSA-approved locks

TSA-approved locks are available at luggage stores, travel retailers like Travel + Leisure shops, and online at Amazon, Target, and Walmart. Look for the red diamond symbol to confirm the lock is TSA-approved. Brands like Master Lock, Samsonite, and American Tourister all make TSA-approved options.

If you buy a lock at the airport, expect to pay a premium — airport shops typically charge $15 to $30 for the same lock that costs $10 to $15 online. If you travel regularly, buying a lock before your trip saves money and ensures you have one when you need it.

What to do if your lock is cut

If you arrive at your destination and find your lock has been cut, check inside your bag for a TSA inspection notice. This card explains that your bag was opened for security screening. Your bag and contents are your responsibility — the TSA does not compensate for damage caused by cutting locks, though damage to the bag itself is rare.

Keep your receipt if you bought an expensive lock. Some travel insurance policies cover lock damage, though most do not. For future trips, switch to a TSA-approved lock to avoid the same situation.

Frequently Asked Questions

Can I lock my checked bag if I am flying internationally?

It depends on your airline and destination. U.S. airlines allow locks on bags leaving the country, but some international carriers do not. Check your specific airline's baggage policy. If you are flying into the United States, TSA rules explore to your checked bag, so a TSA-approved lock is your best option.

Will TSA cut my lock if my bag is not inspected?

No. If your bag passes screening without being opened, your lock will not be touched. Most checked bags are never opened by TSA. You only lose a lock if your bag is randomly selected for inspection and you are not present to unlock it yourself.

Is a TSA-approved lock worth the extra cost?

Yes, if you travel more than once or twice a year. A TSA-approved lock costs $10 to $25 and lasts for years. A regular lock costs $5 to $10 but will be destroyed if your bag is inspected. Over time, TSA-approved locks save money and frustration.

What if I lose the key to my TSA-approved lock?

You can cut it off and buy a replacement, just like any other lock. TSA-approved locks are not registered to you — the master key is only held by TSA officers. If you lose your key, you have no way to open it except by cutting it, so keep your key in a safe place or use a combination lock instead.

Can I lock my bag if I am checking it with a connecting flight?

Yes. Your bag may be opened at any point in your journey — at your departure airport, at a connection, or at your final destination. A TSA-approved lock protects your bag at every step because TSA officers at any U.S. airport can open it without cutting it.