How Strict is Southwest Carry-On Size? A Complete Guide

When booking a trip with Southwest Airlines, it is important to know their carry-on baggage policy. The airline prides itself on being customer-friendly, but just how strict are they regarding Southwest Airlines carry-on size? In this guide, we will tell you everything you need to know about Southwest Airlines baggage policy, and how to get the most out of Southwest baggage allowance for carry-on without incurring extra fees.

Southwest Airlines Carry-On Bag Size: The Essentials

Southwest Airlines carry-on size is a single carry-on bag and a personal item per customer. But each of these must comply with particular size limitations:

Carry-On Bag Size: The largest size permitted is 24 inches (L) x 16 inches (W) x 10 inches (H) with wheels and handle.

Personal Item Size: Your personal item must be small enough to fit under the seat in front of you and usually consists of a purse, briefcase, backpack, or laptop bag.

Unlike other airlines, Southwest Airlines baggage policy does not have a weight restriction for carry-on bags, but they need to fit in the overhead bin.

How Strict is Southwest with Carry-On Size?

Southwest Airlines is fairly tolerant of other airlines, but don't think you can disregard the rules. Gate agents can request that you gate-check your bag if it's too large for Southwest Airlines carry-on size restrictions. Although there are no regular weigh-ins or measurements at security checkpoints, oversized bags can be detected prior to boarding. If your luggage won't fit into the sizer at the gate, you will be forced to check it, possibly incurring additional fees if you have already taken advantage of your two free checked bags.

Southwest Airlines Baggage Policy for Carry-On Bags

Knowing Southwest Airlines' baggage policy can avoid hassle and time in the airport. Some points of interest about carry-on and checked luggage are listed below:

Carry-On Bags: Permitted for free provided they comply with the Southwest Airlines carry-on size limit.

Checked Bags: Southwest has one of the best baggage policies with two free checked bags. Any checked bag cannot weigh more than 50 lbs and 62 linear inches (L + W + H).

Excess Baggage Fees: If you must check more than two bags, excess baggage charges are applicable, typically $75 per additional bag.

Special Items: There are guidelines for sports equipment, musical instruments, and medical devices, so refer to the baggage policy of Southwest Airlines on their main website if you're going to bring these items along.

Southwest Airlines 2025 Baggage Allowance Updates

Currently, as of 2025, Southwest Airlines 2025 baggage allowance for carry-on and checked bags is still the same. Airlines make changes to their policies quite often, though, so it's always best to refer to the Southwest Airlines baggage policy before you go.

For regular flyers, Southwest carry-on baggage allowance still ranks among the best in the business. The airline still provides two free checked bags per passenger, a privilege that distinguishes it from rivals that charge steep fees for checking bags.

How to Make Your Carry-On Bag Compliant with Southwest's Specifications

To stay away from the last-minute surprise at the airport, take the following tips:

Measure Your Bag: Before heading to the airport, ensure your carry-on fits within Southwest Airlines carry-on size limits of 24" x 16" x 10".

Use a Soft-Sided Bag: Soft-sided bags are easier to fit in overhead bins compared to hard-shell suitcases.

Pack Smartly: If your carry-on is too full, consider shifting some items to your item to comply with Southwest Airlines baggage policy.

Arrive Early: If you're worried about the size of your bag, arriving early provides you with time to check it if needed.

Think About Southwest's Free Checked Bag Policy: If your carry-on is just too big, you may want to check it for free rather than risk gate checking.

What if Your Carry-On is Too Large?

If your carry-on bag is larger than Southwest Airlines carry-on size restrictions, you will need to check it at the gate. This is free if you have not used both of your two free checked bags, but it can be a hassle if you want rapid access to your things. If overhead bins are full, flight attendants can also ask passengers to check their carry-ons.

Final Thoughts: Is Southwest Strict on Carry-On Size?

Southwest Airlines is not as strict as some other airlines when it comes to Southwest Airlines carry-on size. However, if your bag is noticeably larger than the allowed dimensions, there’s a good chance you’ll have to check it in. To ensure a hassle-free experience, always measure your bag in advance and stick to the size limits.

By knowing Southwest Airlines' carry-on size, you can pack wisely and save yourself unnecessary stress by being aware of the baggage allowance policy. Have a great flight with Southwest Airlines' liberal baggage policies and hassle-free travel experience!