Can You Lock Your Luggage When Flying International?

You pack carefully, double-check your passport, and zip your suitcase shut. Then comes the pause — hand hovering over a padlock. Should you lock it or leave it open? The advice you hear seems to flip depending on who you ask.

Here is the short version: locking your checked luggage for an international flight is a smart move, but only certain locks work with airport security screening. The right lock keeps your belongings safe while allowing customs and security agents to do their job without damaging your bag.

How TSA-Approved Locks Work for International Travel

TSA-approved locks (sometimes called Travel Sentry locks) use a universal master-key system. Security agents across participating countries carry tools that open these locks without cutting them. The lock then snaps shut again, and your bag stays secured for the rest of the journey.

This system exists because checked luggage gets screened behind the scenes. If a TSA agent or a foreign security officer needs to open your bag and finds a non-standard lock, they may cut it off entirely. A TSA lock avoids that outcome.

Travel industry guidance recommends using these locks for both domestic and international itineraries. The same lock that works in the US also works in most countries that accept the Travel Sentry system, which covers a large number of international destinations.

Why Locking Your Luggage Matters

Some travelers skip the lock, thinking it saves hassle if inspectors need inside. But going unlocked leaves your belongings exposed to a few real risks that a simple lock addresses well.

• Theft deterrence: A locked zipper makes it harder for someone to slip a hand into your bag during transit or at baggage claim. Locking your luggage provides an extra layer of protection against opportunistic theft, per travel security experts.
• Accidental openings: Zippers can slide apart when bags get tossed around during loading. A lock holds the zipper pulls together and keeps your items from spilling out inside the cargo hold.
• Peace of mind during layovers: On long international trips with multiple legs, your bag may sit unattended for hours. A visible lock signals that the contents are protected.
• Consistency across trips: Once you own a TSA-approved lock, you can use it for domestic flights, international travel, trains, and even hostel lockers. One lock covers most situations.

None of this means a lock makes your bag invincible. But travel experts agree that a TSA-approved lock adds a meaningful layer of security for very little weight or cost.

Choosing the Right Lock for Your Trip

Not all luggage locks are built the same, and the choice matters more than you might expect. TSA-approved locks come in combination and key versions, and some suitcases now include built-in TSA locks.

Combination locks let you set your own code and avoid carrying a spare key. Key locks are simpler but require keeping track of a tiny key across your trip. Cable locks work well for soft-sided bags where the zipper pulls are far apart. Travelpro’s guide to lock your luggage when flying internationally explains why matching the lock type to your bag style matters.

If your suitcase already has a built-in lock, check the Travel Sentry logo or TSA-accepted marking before assuming it is approved. Some older built-in locks don’t carry the certification and may get cut just like a hardware-store padlock.

How to Use a TSA Lock Correctly

Owning the right lock helps only if you use it properly. A few simple habits keep your lock functional across multiple trips.

1. Set a unique combination before you travel: Factory-default codes like 0-0-0 are easy for others to guess. Change yours to something memorable that only you know.
2. Keep the master-key slot clear: TSA locks have a small keyhole or slot for the master key. Do not cover it with tags, straps, or stickers that could block agent access.
3. Test the lock before your trip: Pack your bag, close it, and lock it at home. Make sure the mechanism engages smoothly and the zippers sit flush against each other.
4. Store backup information separately: If you use a key lock, put the spare key in your carry-on or personal item. Never pack it inside the locked bag you are checking.

Industry guidance from brands like Briggs & Riley also notes that locking your luggage helps ensure zippers stay closed during rough handling. A quick test before you leave home saves frustration at the airport.

The Risk of Using a Non-TSA Lock

Using a standard padlock on checked luggage carries a real downside that many travelers discover only after it happens. Security officers have the authority to open any bag that triggers further screening. If they cannot open your lock with their tools, they will cut it.

The same principle applies at customs. Your bag may be selected for inspection upon arrival in another country. Without a TSA-approved lock, you risk returning to baggage claim and finding your lock missing and your bag possibly left unsecured. Per the lock your checked luggage article on the Booking platform, using locks that meet official security standards is the safest path for international travel.

If you have no TSA lock available for an upcoming trip and feel uneasy leaving your bag unlocked, zip ties are a temporary alternative — but be aware agents will cut those too if they need inside. A proper TSA lock remains the better long-term solution for frequent international travel.

The Bottom Line

Locking your checked luggage when flying internationally is a smart habit, but only with a TSA-approved lock that security agents can open and re-close without damage. Combination locks give you the convenience of no keys, while key locks work well if you prefer a physical backup. Either option beats leaving your bag unlocked or risking a cut-off padlock.

For specific guidance on your destination country’s lock policies, check with your airline’s baggage department or your departure airport’s security website before you fly — policies can differ outside the TSA system.