Carry-on weight limits vary by airline, but most allow 22 pounds
The weight your carry-on bag can hold depends entirely on which airline you fly. Most major U.S. carriers — American, Delta, United, Southwest — permit 22 pounds (10 kilograms) for a standard carry-on bag. Some airlines set the limit at 26 pounds. A few budget carriers like Spirit and Frontier allow only 18 pounds. International airlines often use 7 kilograms (about 15 pounds) as the standard.
The airline's website or your booking confirmation will state the exact limit for your flight. If you are unsure, call the airline directly before you pack. Weight limits are enforced at the gate, and bags that exceed the limit may be checked at the last minute, which costs money and delays your boarding.
Size and weight work together: your bag must fit the airline's dimension limits and stay within the weight cap. A bag can be the right size but too heavy, or the right weight but too large. Both matter.
Key Takeaways
- Most U.S. airlines allow 22 pounds for carry-on luggage, though some permit 26 pounds and budget carriers may limit you to 18 pounds.
- Weight limits are enforced at the gate, and overweight bags are often checked at the last minute, which incurs a fee.
- Your airline's website or booking confirmation shows the exact weight and size limits for your specific flight.
- A bag that meets the size requirement can still be rejected if it exceeds the weight limit, so weigh your packed bag before arriving at the airport.
How airlines measure and enforce weight limits
Airlines use scales at the gate to weigh carry-on bags. The agent places your bag on the scale, and if it reads over the limit, your bag is typically checked at no charge if the flight is full, or you may be asked to remove items. Some airlines are stricter than others; budget carriers enforce limits more consistently because they charge for checked bags and want to push revenue toward those fees.
The weight shown on the scale includes everything inside the bag — clothes, electronics, toiletries, books, all of it. There is no allowance for the bag itself. If your airline's limit is 22 pounds and your empty bag weighs 3 pounds, you have 19 pounds of packing room.
Enforcement happens at the gate, not at check-in, because carry-on bags are not weighed during the ticket counter process. This means you could pass through security with an overweight bag and only discover the problem when boarding begins. Weighing your packed bag at home on a bathroom scale or kitchen scale prevents this surprise.
What happens if your carry-on is too heavy
If your bag exceeds the weight limit at the gate, the agent will ask you to check it. On a full flight, this is usually free. On a less crowded flight, you may be charged a checked baggage fee (typically $30 to $50 for the first checked bag, depending on the airline). Either way, your bag will not travel with you in the cabin.
Checked bags take longer to retrieve at your destination, and if you are making a tight connection, a last-minute check can cause you to miss your flight. Weighing your bag before you leave home takes five minutes and eliminates this risk entirely.
Some travelers try to redistribute weight by wearing heavier items (a jacket, boots) onto the plane, then removing them once seated. This works in practice, though technically the agent could weigh you and your bag together if they chose to. Most agents do not, but the rule exists, so this method carries a small risk.
Packing strategies to stay within the weight limit
The easiest way to pack light is to choose a smaller number of heavier items instead of many lighter ones. A single pair of jeans weighs less than three pairs of lightweight pants. One thick sweater takes up less weight and space than four thin shirts. Wear your heaviest items on the plane rather than packing them.
Toiletries and electronics add weight quickly. A full-size shampoo bottle, a hair dryer, and a laptop can consume half your weight allowance before you pack a single piece of clothing. Consider buying travel-size toiletries at your destination, or use solid alternatives like shampoo bars and solid deodorant, which weigh less and take up less space.
Choose a lightweight carry-on bag itself. Soft-sided bags typically weigh 2 to 4 pounds, while hard-sided roller bags weigh 5 to 8 pounds. That difference matters when your limit is 22 pounds. Backpacks and duffel bags are often lighter than wheeled luggage.
Carry-on weight limits by major airline
| Airline | Weight Limit | Notes |
|---|---|---|
| American Airlines | 22 pounds (10 kg) | Applies to all cabin classes |
| Delta Air Lines | 22 pounds (10 kg) | Applies to all cabin classes |
| United Airlines | 22 pounds (10 kg) | Applies to all cabin classes |
| Southwest Airlines | 22 pounds (10 kg) | Applies to all cabin classes |
| Spirit Airlines | 18 pounds (8 kg) | Strictly enforced; overweight bags are checked |
| Frontier Airlines | 18 pounds (8 kg) | Strictly enforced; overweight bags are checked |
| JetBlue Airways | 22 pounds (10 kg) | Applies to all cabin classes |
| Alaska Airlines | 22 pounds (10 kg) | Applies to all cabin classes |
International carriers often use metric limits. Air Canada, British Airways, and Lufthansa typically allow 7 kilograms (about 15 pounds) for carry-on bags. Some international airlines permit 10 kilograms (22 pounds). Always check your specific airline's policy before packing, as limits can vary by route and booking class.
Difference between carry-on weight and checked baggage weight
Carry-on bags and checked bags have separate weight limits. Your carry-on may be limited to 22 pounds, but your first checked bag is typically allowed 50 pounds on domestic U.S. flights. This is why some travelers pack light in their carry-on and put heavier items in checked luggage instead.
However, checked bags take time to retrieve and can be lost or delayed. If you are traveling for a short trip or making a tight connection, keeping everything in your carry-on avoids these problems. The trade-off is that you must pack lighter.
If you are checking a bag, you still need a carry-on that meets both the weight and size limits. Airlines do not waive carry-on restrictions just because you are also checking luggage.
How to weigh your bag before the airport
Use a bathroom scale or kitchen scale at home. Place the empty bag on the scale and note its weight. Then pack your items and weigh the full bag. If it exceeds your airline's limit, remove items until it is within range. This takes a few minutes and prevents problems at the gate.
If you do not have a scale at home, many luggage shops and some post offices have scales you can use for free or a small fee. Some gyms also allow members to use their scales. Weighing your bag is worth the small effort.
Digital luggage scales are inexpensive (usually $10 to $20) and useful if you travel frequently. They hang from your bag's handle and display the weight when ready. Some travelers keep one in their luggage permanently.
Frequently Asked Questions
Do airlines weigh carry-on bags at security or only at the gate?
Security checkpoints do not weigh carry-on bags. Weight enforcement happens at the gate during boarding. This is why you can pass through security with an overweight bag and only discover the problem when you reach the gate. Weigh your bag at home to avoid this.
Can I wear heavy items onto the plane to avoid the weight limit?
In practice, most gate agents do not weigh passengers and bags together. Wearing a heavy jacket or boots onto the plane and removing them once seated usually works. However, the rule technically allows agents to weigh you and your bag as a combined unit, so this method carries a small risk on strict airlines.
What if I am flying internationally — do the weight limits change?
International airlines often use lower limits than U.S. carriers. Many allow 7 kilograms (about 15 pounds) instead of 22 pounds. Check your specific airline's website before packing. The limit depends on the airline and route, not just the fact that you are flying internationally.
Is the weight limit the same for all cabin classes?
Most airlines explore the same carry-on weight limit to economy, business, and first class. However, some airlines allow higher limits or additional bags for premium cabin passengers. Check your booking confirmation or the airline's website to see what applies to your specific ticket.
Can I pack my carry-on heavier if I also have a personal item?
No. Your carry-on bag and personal item (backpack, purse, laptop bag) are separate items with separate limits. The carry-on weight limit applies only to your carry-on bag. Your personal item typically has no weight limit, but it must fit under the seat in front of you.