The basic steps for checking luggage
To check in luggage, you arrive at the airport, find your airline's counter or kiosk, place your bag on the scale, and hand it to an agent or scan your boarding pass at a self-service machine. The bag gets a tag, moves onto a conveyor belt, and travels separately to your destination. You will not see it again until you claim it at baggage claim after landing.
The process takes about five minutes per bag at a staffed counter. Self-service kiosks are faster if the line is short, but they work only for standard-sized bags without damage. If your bag is oversized, overweight, or you are traveling with a pet or fragile items, you must use a staffed counter.
Most airlines let you check one or two bags free. A third bag, overweight bag (usually over 50 pounds), or oversized bag (usually over 62 inches in length plus width plus height) costs extra. Check your airline's website before you go to the airport so you know what you will owe.
Key Takeaways
- Arrive at the airport at least two hours before a domestic flight or three hours before an international flight so you have time to check luggage without rushing.
- Pack your bag under the weight and size limits your airline sets, because overweight and oversized bags cost extra money at the counter.
- Have your ID and boarding pass ready when you reach the counter or kiosk, whether you print it at home or show it on your phone.
- Remove any prohibited items before you pack — lighters, sharp objects, and certain liquids cannot fly in checked luggage.
- Keep your baggage tag number or take a photo of it in case your bag is delayed, so you can track it with the airline.
When to arrive at the airport for checked luggage
Arrive at least two hours before a domestic flight. This gives you time to find your airline's counter, wait in line, and check your bag without rushing. If the airport is busy or you are traveling during a holiday, arrive even earlier — three hours is safer.
For international flights, arrive three hours early. International check-in lines move slower because agents verify passports and visas, and some airlines have separate international counters. Arriving early also gives you a buffer if your bag is flagged for inspection or if you need to pay an overweight fee.
If you are running late, go straight to the counter and tell the agent. Some airlines will rush your bag through, but they may charge a late-check fee or refuse to take it if you are too close to departure. Do not count on this — arriving early is always the safer choice.
What you need to bring to the counter
Bring your ID and your boarding pass. Your ID must match the name on your ticket. A driver's license, passport, or state ID card all work. Your boarding pass can be printed on paper or shown on your phone — either is fine.
Have your luggage ready to place on the scale. Do not wrap your bag in plastic or lock it with a padlock, because the TSA may need to open it for inspection. If you want to lock it, use a TSA-approved lock that agents can open with a master key.
Know your airline's baggage policy before you reach the counter. Most airlines allow one free checked bag and charge for a second. Some charge for the first bag. Knowing this ahead of time means no surprises when you are told the total cost.
How weight and size limits work
Most domestic airlines allow checked bags up to 50 pounds and 62 inches (length plus width plus height). A bag that weighs 51 pounds or measures 63 inches will be charged as overweight or oversized. The fee is usually $50 to $100 per bag, depending on the airline.
Weigh your bag at home before you go to the airport. A bathroom scale or a luggage scale from a hardware store costs $15 to $30 and saves you from paying a surprise fee. If your bag is close to the limit, pack lighter or move items to a carry-on.
International airlines sometimes have different limits. Some allow 70 pounds per bag, others allow 44 pounds. Check your airline's website or your confirmation email to see what applies to your flight. The agent at the counter will tell you the fee if you are over, but it is cheaper to know ahead of time and repack.
Using a self-service kiosk versus a staffed counter
Self-service kiosks are faster if your bag is within weight and size limits and has no damage. You scan your boarding pass, place your bag on the scale, and the machine prints a tag and sends your bag down the conveyor. The whole process takes two to three minutes.
Use a staffed counter if your bag is overweight, oversized, damaged, or if you are checking a pet, sports equipment, or fragile items. Agents can override weight limits in some cases, explain fees, and handle special items that kiosks cannot. A counter also works better if you have questions about your flight or baggage policy.
If you are unsure whether a kiosk will accept your bag, ask an agent first. They can look at it and tell you whether to use the kiosk or wait in the counter line. This saves you time and avoids the frustration of starting at a kiosk and being sent to a counter anyway.
What happens to your bag after you check it
After you hand your bag to the agent or it goes down the conveyor at a kiosk, it moves to a sorting area. Baggage handlers scan the tag, load it onto a cart, and move it to the correct plane. Your bag travels in the cargo hold of the same plane you are on.
When you land, your bag goes to baggage claim. A conveyor belt brings it to the carousel assigned to your flight. You claim it by grabbing it off the belt. If your bag does not appear within 15 to 20 minutes, go to the airline's baggage office and report it.
Keep your baggage tag number or take a photo of it before you leave the counter. If your bag is delayed or lost, you will need this number to track it. The airline can use it to find your bag and deliver it to you, sometimes within 24 hours.
Items you cannot pack in checked luggage
Lighters, matches, and flammable liquids are banned from checked bags. So are aerosol cans, certain batteries, and sharp objects like knives or tools. Liquids over 3.4 ounces are also prohibited — this includes shampoo, lotion, and cologne.
Firearms and ammunition have special rules. You can check them, but you must declare them to the agent, pack them unloaded in a locked hard case, and follow your airline's specific process. Call your airline before you travel if you plan to check a firearm.
Check the TSA website or your airline's baggage rules page for a full list of prohibited items. If you are unsure whether something is allowed, ask the agent at the counter before you check your bag. It is easier to remove an item or mail it ahead than to have your bag pulled from the plane.
Frequently Asked Questions
Can I check a bag if I only have a carry-on?
Yes. Checking a bag is separate from your carry-on allowance. Most airlines let you bring one carry-on bag and one personal item (like a purse or backpack) for free, plus pay to check additional bags. You do not have to check a bag just because you have a carry-on.
What if my bag is damaged at the airport?
Report the damage to the agent at the counter before you check it. The agent can note it on your baggage tag so the airline knows the damage happened before your flight, not during it. If your bag is damaged after you check it, report it at baggage claim with a photo and your receipt.
Do I need to lock my checked bag?
You do not have to, but you can use a TSA-approved lock. Regular padlocks can be cut off by TSA agents if they need to inspect your bag, and you will not be reimbursed for the lock. TSA-approved locks have a keyhole that agents can open without damaging the lock.
How much does it cost to check an extra bag?
Most airlines charge $35 to $50 for a second checked bag and $100 or more for a third. Some airlines charge for the first bag. Prices vary by airline and route, so check your airline's website or your confirmation email to see what you will owe before you arrive at the airport.
What if my flight is delayed after I check my bag?
Your bag stays with your flight and travels with you, even if the flight is delayed. You do not need to do anything. When you land, your bag will be at baggage claim as usual. If your flight is cancelled, ask the agent how to retrieve your checked bag or rebook it on the next flight.