Posted by How Big Can Carry On Luggage Be Southwest?
The maximum size for carry on luggage on Southwest Airlines is 24 x 16 x 10 inches (61 x 41 x 25 cm), including handles and wheels. Bags larger than this must be checked. Southwest is strict about these limits, so always measure your bag before traveling to avoid problems at the gate.
Southwest Carry On Luggage Size: Quick Facts
Southwest Airlines allows one carry on bag and one personal item per passenger. The carry on bag must not exceed 24 x 16 x 10 inches. This is slightly larger than some other major U.S. airlines, making Southwest more generous with overhead bin space. Personal items, such as a backpack or laptop bag, must fit under the seat and be no larger than 16.25 x 13.5 x 8 inches.
Southwest’s size rules are enforced at boarding, and staff may ask you to check bags that do not fit their sizer. Overhead bins can fill quickly on busy flights, so following these rules is important to avoid delays or extra fees.
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Understanding Southwest’s Carry On Policy
Southwest’s carry on policy is designed to make boarding smoother and faster. The 24 x 16 x 10 inches limit includes everything attached to your bag—handles, wheels, and external pockets. If your bag is even a little over, it may not fit in the sizer and you could be required to check it at the gate. This rule helps Southwest keep flights on schedule and maximize space for everyone.
Personal items are also closely monitored. They must fit completely under the seat in front of you. This means large tote bags, musical instruments, or shopping bags might not count as personal items if they are too big.
Many travelers do not realize that Southwest’s size allowance is slightly more generous than other airlines. For example, American Airlines limits carry on bags to 22 x 14 x 9 inches. This gives Southwest passengers an extra couple of inches in each direction, which can make a real difference when packing.
Carry On Vs. Personal Item: What’s The Difference?
Southwest lets you bring two things on board: a carry on bag and a personal item. The carry on bag goes in the overhead bin, while the personal item must fit under the seat.
Carry on examples:
- Small suitcase
- Duffel bag
- Small garment bag
Personal item examples:
- Laptop bag
- Purse
- Small backpack
Your personal item cannot be another suitcase or large backpack. Southwest staff are trained to spot oversized bags and may ask you to check them if they do not fit under the seat. In busy travel periods, gate agents are especially careful about enforcing these rules.
Size Comparison: Southwest Vs. Other Airlines
Southwest’s carry on size is bigger than most U.S. airlines. See the comparison below:
| Airline | Max Carry On Size (inches) | Personal Item Size (inches) |
|---|---|---|
| Southwest | 24 x 16 x 10 | 16.25 x 13.5 x 8 |
| Delta | 22 x 14 x 9 | Must fit under seat |
| American Airlines | 22 x 14 x 9 | 18 x 14 x 8 |
| United | 22 x 14 x 9 | 17 x 10 x 9 |
Travelers often miss the fact that an inch or two can make the difference between a bag fitting easily or being too large. If you travel on different airlines, always check their specific limits.
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Southwest Carry On Luggage Weight Limit
Southwest does not have a weight limit for carry on bags, but you must be able to lift your bag into the overhead bin yourself. If you are unable, Southwest staff may require you to check the bag.
This is different from airlines like Air France or Lufthansa, which set strict weight limits for cabin bags. For Southwest, the main concern is size and your ability to handle the bag safely.
What Happens If Your Bag Is Too Big?
If your carry on bag is larger than 24 x 16 x 10 inches, you will need to check it. This can mean going back to the ticket counter or paying a fee if you are at the gate. Southwest does not charge for your first two checked bags, which is rare among U.
S. airlines.
If the overhead bins fill up, Southwest may also require some passengers to check their carry on bags, even if they meet size rules. This usually happens on full flights. In this situation, there is no charge, but you will need to collect your bag at baggage claim.
Travelers sometimes do not realize that checked bags are free on Southwest, which can help if you have slightly larger luggage.
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Tips To Avoid Carry On Problems With Southwest
- Measure your bag carefully before leaving home, including wheels and handles.
- Choose soft-sided luggage if you are close to the size limit, as it can squeeze into sizers more easily.
- Pack light so you can lift your bag into the overhead bin without help.
- Arrive early if you have a larger carry on, as overhead space is first-come, first-served.
- Have a backup plan in case you are asked to check your bag at the gate.
Many travelers assume that if their bag is marked “carry on size” by the brand, it is always allowed. In reality, bag makers often use slightly larger measurements, so always check the true dimensions.
Common Mistakes Travelers Make
- Ignoring handles and wheels: Southwest measures the entire bag, not just the main compartment.
- Using expandable luggage: If you unzip an expansion, your bag may suddenly be too large.
- Packing two large bags: Only one carry on and one personal item are allowed.
- Bringing irregular items: Sports equipment, musical instruments, or shopping bags may not count as personal items if they are too large.
Many travelers are caught off guard at the gate when their bag does not fit the sizer. Always check your bag before leaving for the airport.
Carry On Bag Examples That Work On Southwest
To help visualize, here are some bag types that fit Southwest’s allowance:
- 22-inch rolling suitcase: Most popular carry on size, fits comfortably in overhead bins.
- Small duffel bag: Flexible and easy to squeeze into tight spaces.
- Backpack or daypack: Make sure it’s under the size limit and not overstuffed.
Here is a comparison of common luggage types and their typical dimensions:
| Bag Type | Common Size (inches) | Southwest Allowed? |
|---|---|---|
| 22-inch suitcase | 22 x 14 x 9 | Yes |
| 24-inch suitcase | 24 x 16 x 10 | Yes (max size) |
| 26-inch suitcase | 26 x 18 x 12 | No |
| Large duffel bag | 28 x 15 x 12 | No |
If you are not sure, always go for the smaller bag to avoid trouble at the airport.
Special Items And Exceptions
Southwest does allow some exceptions for special items:
- Strollers and car seats can be brought onboard for children at no extra cost.
- Assistive devices like wheelchairs and medical equipment are not counted as carry on items.
- Garment bags are allowed as carry on if within size limits.
Musical instruments can be carried on if they fit in the overhead bin or under the seat. If not, they must be checked or you can buy an extra seat for them.
Southwest’s Overhead Bin Space: Data Insights
A standard Southwest Boeing 737 has about 120 overhead bin slots for a full flight of 175 passengers. This means not every passenger will always find space for large carry on bags, especially if the flight is full. That’s why Southwest encourages passengers to check larger items and keep the cabin organized.
Data from the U. S. Department of Transportation shows that Southwest’s generous checked bag policy helps reduce boarding times and delays compared to airlines that charge high bag fees. This is a hidden benefit for travelers who want a smoother airport experience.
Packing Strategies For Southwest Carry On
If you want to maximize your packing while staying within the rules:
- Roll your clothes to save space.
- Use packing cubes to organize and compress items.
- Place heavy items near wheels for rolling bags.
- Keep all important documents and valuables in your personal item.
Travelers often forget that liquids must still follow TSA rules—bottles of 3. 4 ounces (100ml) or less, all in a quart-sized bag.
What Not To Pack In Your Carry On
Some items are not allowed in Southwest carry on bags:
- Sharp objects (except small scissors or nail clippers)
- Large bottles of liquids or gels
- Flammable items
- Weapons or replica weapons
Always check the TSA website for the latest list of restricted items before you pack.
Southwest’s Official Luggage Policy
You can always check the most up-to-date information on Southwest’s official site: Southwest Airlines Carryon Policy. Their staff is helpful if you have questions at the airport, and their website has diagrams to show what counts as a carry on or personal item.
Frequently Asked Questions
What Happens If My Bag Is Slightly Over The Size Limit?
If your bag is even a little over 24 x 16 x 10 inches, Southwest may ask you to check it at the gate. Staff use sizers and are strict, especially on full flights. It is best to check your bag dimensions at home to avoid last-minute problems.
Does Southwest Check The Weight Of Carry On Bags?
No, Southwest does not have a weight limit for carry on bags. However, you must be able to lift your bag into the overhead bin yourself. If your bag is too heavy for you to handle, you may be asked to check it.
Can I Bring Food Or Drinks In My Carry On?
Yes, you can bring solid food and snacks in your carry on. All drinks and liquid foods must follow TSA’s 3. 4-ounce rule. Open drinks are not allowed through security, but you can fill a water bottle after passing the checkpoint.
Are There Any Exceptions For Travelers With Children?
Yes, Southwest allows strollers and car seats as additional items for children. These do not count against your carry on allowance. Diaper bags can also be brought on board, but only one per child.
What If I Have Connecting Flights With Other Airlines?
Always check the carry on rules for all airlines on your itinerary. Other airlines may have smaller size or weight limits, and what fits on Southwest might not be accepted on another carrier. Adjust your packing to the strictest rule to avoid trouble.
Traveling with Southwest is less stressful when you know their carry on luggage size policy and pack smart. By following these guidelines, you can avoid surprises at the airport and enjoy a smooth start to your trip.
Md Abdul Muhaimen is an experienced travel content writer and guide who has a Master’s in Information Systems Management from the University of Huddersfield. He is passionate about all things related to travel logistics and trip planning, and has assisted thousands of readers in choosing the proper luggage, knowing which items can be included in carry-on luggage, and understanding an airline’s policy with confidence.
Md Abdul has a sound grounding in systems thinking and data-driven content creation that allows him to bring clarity to complicated travel topics — from comparing the exact sizes of cabin bags from multiple airlines to developing helpful how-to guides to simplify a traveler’s experience.
He actually engages in travel forums on Quora, answers real user questions, and shares insights by posting on Medium blogs
.His work marries first-hand research, consumer-focused advice, and technical accuracy, and he is a voice that can be trusted among the travel and luggage community.