Southwest carry-on limits at a glance
Cabin bag (overhead locker)
All fares
61 × 41 × 25 cm
24 × 16 × 10 in
No published weight limit
Included in the fare
The cabin bag on All fares fares can measure up to 61 × 41 × 25 cm (24 × 16 × 10 in), and the airline publishes no weight limit for it. It is included in the fare. Dimensions include wheels and handles — measure the bag packed, not empty, because a full front pocket can add a couple of centimetres.
Airlines change cabin-bag rules often. These figures were checked in September 2026. Always confirm on Southwest’s official baggage page (opens in a new tab) before you fly — the airline’s own rules apply at the gate.
How to pack for Southwest’s limits
The 61 × 41 × 25 cm cabin bag is a standard overhead-bin size. A soft-sided bag gives you more room for the same outer dimensions than a hard shell, and packing cubes stop it bulging past the depth limit.
- Wear your heaviest shoes and jacket on the plane — they don’t count towards the bag.
- Roll or fold clothes into packing cubes and keep the bag’s depth in check; depth is the measurement most bags fail.
- Plan outfits that share pieces, so three tops and two bottoms cover a week. The outfit planner works this out per day.
- Weigh the packed bag at home. Luggage scales are cheap and save surprises at the gate.
For a full list built around a small bag, see the carry-on only packing list and our guide to packing carry-on only for a week.
Liquids in carry-on
Most airports still limit cabin liquids to containers of 100 ml (3.4 oz) in one clear 1-litre bag. Some airports with new scanners allow more — check your departure airport before you fly.
How Southwest compares
A bag at Southwest’s cabin bag limit (61 × 41 × 25 cm) is bigger on at least one side than the matching rule at every other airline we track — so check each airline before reusing it.
Want one bag for every airline? Taking the smallest length, width and depth across all cabin-bag rules we track gives 55 × 35 × 20 cm (21.5 × 14 × 8 in): a bag within that size fits all of them. Sides are compared longest to longest, because a bag can be turned to fit the sizer.
Longest side 61 cm is 24 in. Inches are rounded to the nearest half inch.
Southwest carry-on: quick answers
What size carry-on does Southwest allow?
The cabin bag on All fares fares can measure up to 61 × 41 × 25 cm (24 × 16 × 10 in), and the airline publishes no weight limit for it. It is included in the fare. Checked September 2026 — confirm on Southwest’s own page before you fly.
Does Southwest weigh carry-on bags?
Southwest doesn’t publish a weight limit for this bag in the rule we track, so size is what matters — but you must be able to lift it into the overhead bin yourself.
Will my Southwest bag fit on other airlines?
A bag at Southwest’s limit (61 × 41 × 25 cm) is larger on at least one side than every other airline’s matching rule we track, so check each airline before reusing it.