So, you're ready to pack your bags and head off on a Southwest adventure, but that nagging question about luggage size keeps popping up? Don't worry, you're not alone! Figuring out airline baggage policies can feel like deciphering a secret code, but with Southwest, it's actually quite straightforward once you know the key numbers.
Let's dive in and break down exactly how big your suitcase can be on Southwest Airlines, step-by-step, so you can pack with confidence and avoid any last-minute airport surprises.
Step 1: Identify Your Baggage Type - Are You Carrying On or Checking In?
Before we talk numbers, it's crucial to distinguish between the two main types of luggage you'll be bringing:
Carry-on Bag: This is the bag you take with you into the cabin and store in the overhead bin.
Personal Item: This is a smaller bag that fits under the seat in front of you (e.g., a purse, laptop bag, small backpack).
Checked Baggage: These are the larger suitcases you hand over at the ticket counter to be stored in the cargo hold of the plane.
Got that? Great! Now let's get into the specifics for each.
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| How Big Can A Suitcase Be On Southwest Airlines |
Step 2: Understanding Carry-On and Personal Item Dimensions
Southwest is known for its relatively generous carry-on policy. You get one carry-on bag AND one personal item for free.
2.1: Your Carry-On Bag: The Overhead Bin Dweller
Your carry-on bag needs to fit comfortably in the overhead compartment.
The maximum dimensions for a Southwest carry-on bag are: 24 inches (L) x 16 inches (W) x 10 inches (H).
This includes handles and wheels! So, when you're measuring, make sure you measure from the absolute furthest point to furthest point.
Good news! Southwest generally doesn't have a weight limit for carry-on bags, as long as you can comfortably lift it into the overhead bin yourself. If you can't, they might ask you to gate-check it.
2.2: Your Personal Item: The Under-Seat Companion
Your personal item is your smaller companion, fitting right under the seat in front of you.
The maximum dimensions for a personal item are generally around: 18.5 inches (L) x 13.5 inches (W) x 8.5 inches (H).
Again, these dimensions include any handles or wheels.
Common examples include a purse, a laptop bag, a small backpack, or a briefcase. Just like carry-on bags, there's typically no weight limit, as long as it fits under the seat.
Step 3: Decoding Checked Baggage Size and Weight Limits
QuickTip: Slowing down makes content clearer.
This is where the "how big can a suitcase be" question usually comes into play most directly. Southwest has specific rules for checked luggage.
3.1: The "62 Linear Inches" Rule
For standard checked baggage, the maximum size is determined by "linear inches."
This means you add the length + width + height of your suitcase.
The total sum of these three dimensions cannot exceed 62 linear inches (or 157 centimeters).
To measure accurately: Use a measuring tape. Measure the longest side (length), the next longest side (width), and the depth (height) of your suitcase, including any wheels and handles. Add these three numbers together.
3.2: The Weight Limit: 50 Pounds is Key
Beyond size, weight is a critical factor for checked bags.
Each standard checked bag must weigh 50 pounds (23 kg) or less.
Why is this so important? Exceeding this weight limit will incur additional fees, which we'll discuss next.
Step 4: Understanding Oversize and Overweight Baggage Fees
This is where you want to pay close attention to avoid unexpected costs! Southwest charges fees for bags that are either too big or too heavy.
4.1: Overweight Baggage Fees
If your checked bag exceeds the 50-pound limit:
Bags weighing 51 to 100 pounds (24 to 46 kg) will incur an overweight fee, generally around $75 to $100 USD per bag, per direction. Note: As of May 28, 2025, some sources indicate potential changes to these fees, with 51-70 lbs costing $100 and 71-100 lbs costing $200. Always check the official Southwest website for the most current pricing.
Bags exceeding 100 pounds (46 kg) will generally NOT be accepted as checked baggage. They may need to be shipped via Southwest Cargo if you are a "Known Shipper."
4.2: Oversize Baggage Fees
If your checked bag exceeds the 62 linear inches limit:
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Bags measuring 63 to 80 linear inches (160 to 203 cm) will be considered oversized.
An oversize fee, generally around $75 to $200 USD per bag, per direction, will apply. Again, be aware of potential fee updates; as of May 28, 2025, some sources suggest a $200 fee for 63-80 inches.
Bags exceeding 80 linear inches (203 cm) are typically NOT accepted as checked baggage. An exception exists for active-duty military personnel, who can check bags up to 80 inches and 100 pounds without fees.
4.3: What if it's both Overweight AND Oversized?
If your bag is both overweight and oversized, only one fee will generally apply, whichever is higher, as long as it does not exceed the absolute maximum limits (e.g., 100 lbs and 80 linear inches).
Step 5: Special Considerations and How to Avoid Fees
Knowing the limits is half the battle; the other half is smart packing!
5.1: Pack Light and Smart
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Weigh your bags at home! This is the single most effective way to avoid overweight fees. A simple luggage scale is an inexpensive investment that can save you significant money.
Utilize your personal item: Maximize your personal item for heavier or bulkier items that don't need to be checked.
Wear your heaviest items: If you're teetering on the edge of a weight limit, consider wearing your bulkiest shoes or jacket instead of packing them.
Consider shipping: For extremely heavy or numerous items, especially if you're relocating, a luggage shipping service might be more cost-effective than airline baggage fees.
5.2: Southwest's "Bags Fly Free" Policy (and recent changes!)
Historically, Southwest has been famous for its "Bags Fly Free" policy, allowing two free checked bags per passenger. However, it's crucial to note that as of May 28, 2025, Southwest Airlines has revised this policy!
For most travelers, checked bags are no longer free and will incur fees.
First checked bag: Generally around $35.
Second checked bag: Generally around $45.
Third or more checked bags: Generally around $150 per bag.
Exceptions for free checked bags may still apply for:
Business Select fares.
Rapid Rewards A-List and A-List Preferred members (2 free checked bags for A-List Preferred, 1 for A-List).
Southwest Rapid Rewards credit card holders (often 1 free checked bag).
Active-duty military personnel (exempt from two-piece baggage limit and excess, oversize, or overweight charges, up to 100 pounds and 80 inches).
Always verify the most up-to-date policy on the official Southwest Airlines website or when booking your specific fare type.
5.3: Sports Equipment and Other Special Items
Southwest often has specific policies for sports equipment (like skis, golf clubs, surfboards). These items typically count as one piece of checked baggage and may have different size/weight allowances, though overweight/oversize fees can still apply if they exceed certain thresholds. Always check Southwest's "Special Baggage" section on their website if you're traveling with unusual items.
Step 6: Double-Check Before You Fly!
Airline policies can change, so it's always a good idea to:
Visit the official Southwest Airlines website: Their "Baggage" or "Optional Travel Charges" page will have the most current and authoritative information.
Review your ticket and fare type: Some special fares or loyalty program statuses come with different baggage allowances.
Measure and weigh your bags just before leaving for the airport. This ensures you haven't accidentally overpacked since your initial measurements.
By following these steps, you'll be well-prepared and can enjoy a smooth, baggage-fee-free (or at least fee-aware!) travel experience with Southwest Airlines!
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10 Related FAQ Questions
How to measure a suitcase for Southwest Airlines?
To measure your suitcase, use a measuring tape to find its length, width, and height, including wheels and handles. For checked bags, add these three dimensions together to get the "linear inches." For carry-ons and personal items, ensure each individual dimension (L, W, H) is within the limits.
How to avoid overweight baggage fees on Southwest?
Weigh your bag at home using a luggage scale to ensure it's under 50 pounds. Redistribute items to your personal item or carry-on, or consider wearing heavier clothing items.
How to get free checked bags on Southwest Airlines?
As of May 28, 2025, free checked bags are generally no longer standard. You can typically get free checked bags if you book a Business Select fare, are a Rapid Rewards A-List or A-List Preferred member, hold a Southwest Airlines co-branded credit card, or are active-duty military.
How to handle oversized sports equipment on Southwest?
Check Southwest's "Special Baggage" policy on their website for specific guidelines on sports equipment. These items usually count as one checked bag, but may have their own size/weight rules and could still incur overweight or oversized fees.
How to pack a carry-on for Southwest effectively?
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Utilize packing cubes to compress clothes, roll items tightly, and prioritize essentials. Make sure liquids comply with TSA 3-1-1 rules. Remember, it must fit in the overhead bin and you must be able to lift it yourself.
How to know if my personal item fits under the seat on Southwest?
Measure your personal item to ensure it doesn't exceed 18.5" x 13.5" x 8.5". If it's a soft-sided bag, make sure it's not overstuffed, allowing it to conform to the under-seat space.
How to pay for extra baggage on Southwest?
You pay for extra, overweight, or oversized baggage at the Southwest Airlines ticket counter when you check in at the airport. Pre-payment options are generally not available for these fees.
How to check the latest baggage policy updates for Southwest?
Always refer to the official Southwest Airlines website, specifically their "Baggage" or "Optional Travel Charges" section, for the most current and accurate information on their policies and fees.
How to travel with musical instruments on Southwest?
Small musical instruments can often be carried on if they fit in the overhead bin or under the seat. Larger instruments may need to be checked as baggage (potentially incurring oversize fees) or require the purchase of an extra seat. Check Southwest's specific policy for musical instruments.
How to get an exception for baggage size/weight limits on Southwest?
Active-duty military personnel with a valid military ID are generally exempt from excess, overweight, and oversized baggage charges for up to two bags, provided they don't exceed 100 pounds or 80 linear inches. Other exceptions are rare and usually apply to specific medical equipment.
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