Southwest Carry-On Size Guide

Southwest allows a bigger carry-on than any other major US airline: 24 x 16 x 10 inches, wheels and handles included, plus a personal item up to 18.5 x 13.5 x 8.5 inches. There is no published weight limit for carry-ons. These numbers were accurate as of mid-2026, and since airline policies change, Southwest's own site is the final word.

The most generous carry-on limit among the majors

While American, Delta, and United all cap cabin bags at 22 x 14 x 9 inches, Southwest's limit is 24 x 16 x 10. That extra two inches of height, two of width, and one of depth adds up to meaningfully more packing volume, enough that some travelers who check a bag elsewhere can go carry-on only on Southwest. The measurement covers the whole bag: wheels, feet, side handles, and the top of the retracted trolley handle are all part of it, so measure your case standing on the floor, from the ground to its highest point.

One caution comes with the generosity. A bag bought to fill Southwest's allowance will be oversized on nearly every other US airline, and on most international carriers too. If Southwest is one airline you fly rather than the only airline you fly, a case built to the 22 x 14 x 9 standard fits everywhere, including Southwest, with room to spare in the sizer.

Personal item allowance

Southwest permits one personal item up to 18.5 x 13.5 x 8.5 inches alongside the carry-on. It stows under the seat in front of you and covers the usual candidates: a backpack, laptop bag, purse, or small duffel. Between the oversized carry-on limit and one of the larger personal item allowances in the industry, the total cabin capacity on Southwest is the best of the US majors. How you split your packing between the two bags is its own small science; our guide on how to pack a carry-on covers it.

Weight policy

Southwest publishes no weight limit for carry-on bags. The working rule is the same as everywhere in the US: if you can lift it into the bin unassisted, it flies. Keep dense items low in the bag for rolling stability, and remember that spare lithium batteries and power banks belong in the cabin with you, never in a bag that gets checked at the gate or the counter.

Checked bags changed, and it makes the carry-on matter more

For decades, two free checked bags was Southwest's signature. That era ended in 2025, when Southwest dropped the blanket policy for most fares. Baggage benefits now depend on the fare type you buy and your status in the Rapid Rewards program, with free checked bags surviving on certain higher fare tiers and for certain elite and cardholder categories. The details have shifted since the change and may shift again, so treat any summary, including this one, as a snapshot and check the current fare rules when you book.

The practical consequence is simple: flying carry-on only on Southwest is more valuable than it used to be. With the industry's largest mainline carry-on allowance and a roomy personal item, Southwest is arguably the easiest US airline on which to skip checked baggage entirely, and now there is a direct financial reason to do it on most fares.

Sizers, boarding, and the gate

Southwest uses sizer frames like everyone else, and a bag within 24 x 16 x 10 has an easy time with them. The pressure point on Southwest is bin space rather than bag size. Boarding position determines when you get to the bins, and passengers boarding late on full flights are the ones whose bags get gate-checked when overhead space runs out. A gate-check of a compliant bag is free and the bag arrives at baggage claim, but if you want your case in the cabin, an earlier boarding position is the lever. Southwest's boarding and seating model has also been evolving through this period, so check how boarding works on your fare when you book.

Practical tips for flying Southwest

• Do not buy a 24-inch bag just because Southwest allows it, unless Southwest is genuinely your only airline. A standard 22 x 14 x 9 case fits every major US carrier.
• Measure with wheels and handle included. Even a generous limit is still a limit.
• Compare fares honestly: a cheap fare plus a checked bag fee can cost more than a higher tier that includes bags. Run the math per trip.
• Secure an early boarding position when the bin matters to you, whether through fare tier, status, or paid early boarding options.
• Put essentials and batteries in the personal item so an end-of-boarding gate-check is an inconvenience, not a problem.

Southwest allowances at a glance

Allowance	Limit
Carry-on size	24 x 16 x 10 in
Personal item	18.5 x 13.5 x 8.5 in
Carry-on weight	No published limit
Checked bags	Depends on fare and status

Dimensions include wheels and handles and reflect mid-2026 policy. Verify on Southwest's site before you fly.

Common questions

What size carry-on does Southwest allow?

Up to 24 x 16 x 10 inches, including wheels and handles. That is larger than the 22 x 14 x 9 standard used by American, Delta, and United.

Does Southwest still have two free checked bags?

Not as a blanket policy. Southwest ended it for most fares in 2025. Whether checked bags are included now depends on your fare type and Rapid Rewards status, so read the fare rules for your specific booking.

Does Southwest weigh carry-on bags?

No. Southwest publishes no carry-on weight limit. If it fits the size allowance and you can lift it into the bin, it is fine.

Will a standard 22 x 14 x 9 carry-on fit Southwest's sizer?

Easily. Southwest's limit is larger in every dimension, so a case built to the common US standard clears it with room left over.

Can Southwest gate-check my carry-on?

Yes, when bins fill up on a full flight, bags boarding late get checked at the gate for free. Boarding earlier is the way to keep your bag in the cabin.

One case that fits Southwest and everyone else

The TALO Cabin is built to standard cabin sizing for major US airlines, which means it clears Southwest's larger sizer easily and still fits the tighter frames at American, Delta, and United. See The Cabin, get the full cross-airline picture in our carry-on size guide, and check carry-on weight limits before international trips.