Does Southwest measure carry-on bags at the gate?

Sometimes, Southwest staff may take a look at bag sizes at the gate, especially on full flights, limited overhead bin space, or if your bag looks oversized.

Are musical instruments allowed as carry-on items on Southwest?

Yes. You can bring musical instruments as a carry-on if they meet Southwest’s size limits and fit in the overhead bin or under the seat.

Can I bring a garment bag as a carry-on?

As long as the garment bag is within Southwest’s carry-on size limits, you are allowed to bring it.

Do carry-on size rules change based on the aircraft?

Southwest applies the same carry-on size rules across all aircraft. However, smaller overhead bins may fill up faster on certain planes.

Does EarlyBird Check-In or Business Select affect carry-on rules?

No. These options only give you an earlier boarding position and do not change carry-on size limits. Boarding earlier does improve your chances of finding overhead bin space.

Is overhead bin space guaranteed on Southwest?

No. Overhead bin space is available on a first-come, first-served basis due to Southwest’s open seating policy. Boarding earlier helps, but space is never guaranteed.

Can I bring sports equipment as a carry-on?

Some sports items, such as helmets or skateboards, may be allowed if they fit within carry-on size limits. Larger equipment must be checked.

Are medical devices counted as carry-on bags?

No. Approved medical devices and mobility aids do not count toward your carry-on or personal item allowance.

How does Southwest handle fragile items in carry-on bags?

Southwest has limited responsibility for fragile items, so it is best to keep valuable or breakable items in your personal item.

Can I bring a carry-on, a personal item, and a pet carrier?

No. A pet carrier counts as either your carry-on or your personal item, so you cannot bring all three.

What happens if overhead bins are full when I board?

If overhead bins are full, Southwest may ask you to gate-check your carry-on bag, which is usually returned at baggage claim after landing.

Do gate-checked carry-on bags count toward the two free checked bags?

No. Gate-checked carry-on bags do not count toward Southwest’s two free checked bags allowance.

What if my carry-on is damaged during gate check?

Southwest has limited responsibility for gate-checked carry-on bags, so valuables and fragile items should always be kept with you.

What backpack size works best for Southwest?

A medium-sized backpack that fits under the seat works best, especially if you plan to use it as a personal item.

How strict is Southwest compared to other airlines?

Southwest is generally more relaxed and flexible than many other airlines, but enforcement can still vary by flight.

Are carry-on rules different on international Southwest flights?

No. Southwest applies the same carry-on size and baggage rules on both domestic and international flights.

How Strict Is Southwest About Carry-on Size ? 2026

Planning to book your flight with Southwest, but curious how strict they are with carry-on?

Generally, you can bring any type of bag in Southwest as your main carry-on if it is within the following size: 24 x 16 x 10 inches (61 cm x 41 cm x 25 cm), including handles and wheels (additional charges may apply if it exceeds these dimensions).

There is a higher likelihood that Southwest staff will check the size of your bag to make sure it is within the size limits. If it does, it will need to be checked.

This detailed guide covers everything you need to know about Southwest carry-on size limits to help you avoid hassle at the airport and prevent any surprises.

Let’s find out.

TL;DR

Southwest is slightly strict about carry-on size
You are allowed one carry-on and one personal item
The maximum carry-on size is 24 x 16 x 10 inches, including wheels and handles
The carry-on must fit in the overhead bin
There is no carry-on weight limit, but you must be able to lift the bag yourself
Slightly oversized soft-sided bags may be allowed at the discretion of staff
If the bag does not fit, it will be gate-checked for free
Southwest includes two free checked bags
Gate-checked bags are usually picked up at baggage claim

southwest carry on size — Courtesy / Southwest Airlines

Table of Contents

How Strict Is Southwest About Carry-on Baggage Size?

Southwest Airlines is slightly strict about its carry-on size.

Therefore, you need to ensure that your carry-on bag do not excessively go over their size limits.

Southwest Airlines allows one carry-on bag plus one small personal item.

A Southwest-approved carry-on bag must not exceed 24” L x 16” W x 10” H (61 × 41 × 25 cm).

You will need to place your carry-on bag in the overhead bin, and it must fit properly.

Placing it with the wheels facing outward can help you retrieve it faster.

If your bag does not fit in the overhead bin, it will not be accepted as a carry-on and will be subject to gate check-in.

You will then need to pick it up at baggage claim.

When traveling with a pet, its carrier will be considered either your personal item or your carry-on bag.

To compare with other airlines, Southwest allows slightly larger dimensions (10″ H x 16″ W x 24″ L) 61 × 41 × 25 cm compared to the standard 9″ H x 14″ W x 22″ L (23 × 36 × 56 cm), providing an extra inch in height, two inches in width, and two inches in length.

How Strict Is Southwest With Carry-on Weight?

There is no weight limit for carry-on luggage on Southwest Airlines.

They don’t control the weight of carry-on bags.

But you must be able to lift your bag into the overhead bin yourself without any help.

What Happens If Your Carry-on Is Slightly Over the Allowed Size?

If your bag is just tiny bit larger than the allowed dimensions, the airline staff at the airport will decide wether to let it through or not.

However, if you are traveling with a backpack or a soft-sided bag, you may be able to squeeze it into the luggage sizer.

Soft bags, such as backpacks and duffle bags, are easier to fit, even if they are slightly oversized.

That said, rules are rules, and it is best to comply with them.

For example, a passenger named Jill reached out to Southwest customer service on X (formerly Twitter), asking whether her 10″ x 15″ x 25” (25 × 38 × 64 cm) bag, including wheels, would be accepted as a carry-on since it slightly exceeded the allowed dimensions.

Southwest responded that carry-on bags must not exceed 10″ x 16″ x 24″ (61 × 41 × 25 cm) (including handles and wheels).

They further advised that if the bag was slightly larger, she could check it free of charge, provided it weighed 50 pounds or less.

AskTSA answer on X about southwest carry-on size

While Southwest customer service will not officially approve oversized carry-ons, a soft-sided bag might still fit in the sizer.

Does Southwest Charge for Carry-on Bags?

No, Southwest Airlines does not charge for carry-on bags.

Southwest allows carry-on items that meet the standard dimensions free of charge. However, any bag exceeding the size limits must be checked.

What Is The Southwest Checked Baggage Allowance?

In addition to your free carry-on allowance, Southwest allows you also to bring two checked bags free of charge.

The good news is that if your carry-on bag exceeds the allowed size, you can check it in for free and avoid additional charges.

The only drawback of checking a bag is the risk of damage or loss of valuable items.

What Is the Best Bag for Southwest Carry-on?

Although Southwest can be generous with its carry-on size allowance, I recommend choosing a suitcase that meets the requirements of most airlines.

If you plan to carry only one hard-sided suitcase, I suggest going with a smaller option like the Kenneth Cole Reaction 20-Inch Carry-On (21.75” H x 14.5” W x 8.5” D).

Alternatively, you can opt for the Rockland Fashion Soft-Side Upright Luggage Set, which includes a carry-on and a personal bag, helping you avoid extra baggage fees.

What About Infant Car Seats?

In addition to the standard free baggage allowance, if you are traveling with infants you can check one stroller and one CRS (Child Restraint System) or car seat per child free of charge.

However, the airline does not assume liability for damage to strollers, CRS, or car seats, so you should take precautions to protect your items.

Final Thoughts: How Strict Is Southwest About Carry-on Size?

To avoid inconvenience at the airport, ensure that your carry-on bag meets Southwest’s size limits.

In some cases, slightly oversized carry-on bags may still be accepted, but this depends on the airline staff at the check-in counter.

I hope this guide helps.

Happy travels.

Southwest Carry-On Size FAQ

Does Southwest measure carry-on bags at the gate?
Sometimes, Southwest staff may take a look at bag sizes at the gate, especially on full flights, limited overhead bin space, or if your bag looks oversized.
Are musical instruments allowed as carry-on items on Southwest?
Yes. You can bring musical instruments as a carry-on if they meet Southwest’s size limits and fit in the overhead bin or under the seat.
Can I bring a garment bag as a carry-on?
As long as the garment bag is within Southwest’s carry-on size limits, you are allowed to bring it.
Do carry-on size rules change based on the aircraft?
Southwest applies the same carry-on size rules across all aircraft. However, smaller overhead bins may fill up faster on certain planes.
Does EarlyBird Check-In or Business Select affect carry-on rules?
No. These options only affect boarding position and do not change carry-on size limits.
Is overhead bin space guaranteed on Southwest?
No. Overhead bin space is first-come, first-served and is never guaranteed.
Can I bring sports equipment as a carry-on?
Some sports items may be allowed if they fit within carry-on size limits. Larger equipment must be checked.
Are medical devices counted as carry-on bags?
No. Approved medical devices and mobility aids do not count toward your carry-on allowance.
How does Southwest handle fragile items in carry-on bags?
Southwest has limited responsibility for fragile items, so it is best to keep them in your personal item.
Can I bring a carry-on, a personal item, and a pet carrier?
No. A pet carrier counts as either your carry-on or your personal item.
What happens if overhead bins are full when I board?
Southwest may ask you to gate-check your carry-on bag if bins are full.
Do gate-checked carry-on bags count toward free checked bags?
No. Gate-checked carry-ons do not count toward the two free checked bags.
What if my carry-on is damaged during gate check?
Southwest has limited responsibility, so valuables should always stay with you.
What backpack size works best for Southwest?
A medium backpack that fits under the seat works best.
How strict is Southwest compared to other airlines?
Southwest is generally more relaxed, but enforcement can still vary.
Are carry-on rules different on international Southwest flights?
No. The same carry-on rules apply on international flights.

People also ask:

Have a comment or question about this article? You can contact us on Instagram or Facebook.

Alysa is an experienced writer, editor and a digital nomad. She is an over-packer, Alysa has explored over 25 countries, enjoys warm destinations and she firmly believes that traveling should be hassle-free, fun and enjoyable.