Southwest Airlines carry-on size and weight in 2026
Southwest Airlines (USA, IATA code WN) allows cabin bags up to 61 cm long, 40 cm wide and 25 cm deep; there is no separate weight limit as long as the bag fits the sizer.
The dimensions include wheels, handles and outer pockets. A soft bag can usually be squeezed a little, but a hard-shell suitcase cannot lose that extra centimetre — and that is exactly when gate staff ask you to pay.
The Southwest Airlines sizer is a double one: besides the main space there is a slot for a small personal item of 41×34×20 cm.
Instead of guessing, open Kalibrator: pick Southwest Airlines, enter the size of your suitcase or bag and see in 3D whether it fits the sizer and where exactly it sticks out.
Source: official Southwest Airlines rules. Data as of 2026-11-03.
Frequently asked questions
What is the Southwest Airlines carry-on size?
Up to 61×40×25 cm (length × width × depth), including wheels and handles.
How much can Southwest Airlines hand luggage weigh?
There is no separate weight limit; the item just has to fit the sizer.
Can I bring an extra bag on Southwest Airlines?
Yes, the sizer has a slot for a small personal item of 41×34×20 cm. A small bag or backpack that fits it is checked against that slot.
How do I check whether my suitcase fits?
Open Kalibrator with Southwest Airlines selected and enter three dimensions — the site shows your suitcase in a 3D sizer and tells you where it sticks out.
How accurate is this data?
The allowances come from the airline's official website (link below). Rules change from time to time, so check with the airline before your flight.