Southwest carry-on size rules are simple and traveler-friendly, but knowing the exact limits can save you time and stress at the airport. Southwest has specific rules for carry-on baggage, including luggage size, cabin baggage size, and baggage allowance. Understanding the correct carry-on luggage size, personal item rules, and size restrictions will help you avoid delays or extra fees when boarding.
Southwest Carry-On Luggage Size & Weight Limits
| Baggage Type | Size (cm) | Size (inches) | Weight | Allowance |
|---|---|---|---|---|
| Carry-on bag | 61 x 41 x 25 cm | 24 x 16 x 10 in | Not specified | 1 bag |
| Personal item | Not specified | Not specified | Not specified | 1 item |
Southwest allows passengers to bring one carry-on bag and one personal item onboard. While the airline clearly defines carry-on luggage size, it does not publish exact dimensions for personal items.
Data verified from official airline sources.
Source: Southwest Official Policy
Carry-On Dimensions & Size Restrictions for Southwest
The official carry-on size for Southwest Airlines is:
- 24 x 16 x 10 inches (61 x 41 x 25 cm)
- Includes wheels and handles
This is the maximum allowed size for cabin baggage. Your bag must fit in the overhead bin.
Important things to keep in mind:
- Bags larger than this will need to be checked
- Overpacking can cause your bag to exceed size limits
- Soft-sided luggage may flex slightly, but it should still fit
Practical tip: Choose a carry-on that’s slightly smaller than the maximum allowed size to avoid issues at boarding.
Carry-On Weight Limit & Baggage Allowance
Southwest does not specify a strict carry-on weight limit in its official policy.
Instead, the airline focuses on:
- Size restrictions
- Safe handling of your bag
Your baggage allowance includes:
- 1 carry-on bag
- 1 personal item
Even without a listed weight limit, make sure you can lift your bag into the overhead bin without assistance.
Southwest Personal Item Size & Carry-On Bag Allowance
Southwest allows one personal item in addition to your carry-on bag.
Important rule:
Your personal item must fit under the seat in front of you
Examples of personal items:
- Backpack
- Handbag
- Laptop bag
- Small tote
Southwest does not specify exact personal item dimensions in its official policy.
Helpful guidance:
In general, many travelers use smaller bags (around 16–18 inches in width) as a safe reference. However, it’s best to keep your bag compact so it easily fits under the seat.
Southwest Carry-On Size Restrictions & Rules
Southwest has straightforward and easy-to-follow carry-on rules:
- Bags must fit in overhead bins or under the seat
- All items must comply with TSA regulations
- Hazardous or restricted items are not allowed
Liquids rule:
- Follow TSA’s 3-1-1 liquid policy
- Keep liquids in a clear, resealable bag
If you’re unsure about an item, it’s always safer to pack it in checked baggage.
Maximum Carry-On Size Allowed by Southwest
The maximum carry-on luggage size allowed is:
24 x 16 x 10 inches (61 x 41 x 25 cm)
This includes:
- Wheels
- Handles
- External pockets
If your bag exceeds this size, it will need to be checked.
Important: Airport staff may visually inspect or measure your bag at the gate.
How Strict Is Southwest With Carry-On Size?
Based on traveler experience, Southwest is generally consistent but reasonable when enforcing carry-on size rules.
You may face stricter checks:
- On full flights
- When overhead bins are full
- If your bag looks oversized
More relaxed situations:
- When your bag fits easily in storage
- On less crowded flights
Real-world tip: If your bag looks bulky, it’s more likely to be checked—even if it’s technically within limits.
Carry-On Rules for Domestic vs International Flights
Southwest primarily operates domestic flights, and the carry-on rules remain the same across all routes.
There are no major differences in:
- Carry-on size
- Baggage allowance
- Cabin baggage rules
However, international routes may involve additional security checks depending on the airport.
What Happens If Your Carry-On Exceeds Size or Weight Limits?
If your carry-on exceeds the allowed size:
At the gate:
- Your bag will be checked
- Additional baggage fees may apply
During boarding:
- Staff may remove oversized bags
Pro tip: Always measure your luggage before heading to the airport to avoid surprises.
Carry-On Allowance by Fare Class (Economy vs Business)
Southwest has a simple and uniform baggage policy.
All fare types include:
- 1 carry-on bag
- 1 personal item
There is no difference in carry-on allowance based on fare class.
However, earlier boarding groups have better access to overhead bin space.
FAQs About Southwest Carry-On Size
What is the carry-on luggage size for Southwest?
The carry-on size limit is 24 x 16 x 10 inches (61 x 41 x 25 cm).
What size carry-on bag is allowed?
Any bag within the maximum allowed dimensions that fits in the overhead bin is permitted.
What is the maximum carry-on size?
The maximum allowed size is 24 x 16 x 10 inches, including handles and wheels.
Does Southwest have size restrictions?
Yes, Southwest enforces size restrictions for carry-on luggage to ensure it fits in cabin storage.
What is the personal item size allowed?
Southwest does not specify exact dimensions. Your personal item must fit under the seat in front of you.
How strict is Southwest with carry-on baggage?
Southwest is generally consistent but may enforce rules more strictly on full flights.
What happens if my carry-on is oversized?
Your bag will be checked at the gate, and additional fees may apply.
 Final Thoughts
Southwest Airlines offers one of the most straightforward carry-on policies. With a clearly defined carry-on luggage size and flexible baggage allowance, it’s easy to plan your packing.
The key is to stay within the allowed dimensions and keep your personal item compact. By understanding these rules in advance, you can avoid stress, save money, and enjoy a smooth travel experience.