Southwest Airlines Carry-On Rules & Size Limits (2026)
Planning to fly with Southwest Airlines (WN) and wondering what you can bring on board? This comprehensive guide covers everything about Southwest Airlines carry-on baggage rules including exact size dimensions, weight restrictions, personal item policies, and what additional items you can bring free of charge. All information is verified against Southwest Airlines's official policies and updated regularly.
Quick Answer
Southwest Airlines carry-on size limit: 24 x 16 x 10 inches (61 x 41 x 25 cm). Carry-on is free for all fares. Personal item: 18 x 14 x 8 inches (always free).
Size Limits at a Glance
| Bag Type | Size (inches) | Size (cm) | Fee |
|---|---|---|---|
| Carry-On Bag | 24 x 16 x 10 | 61 x 41 x 25 | Free |
| Personal Item | 18 x 14 x 8 | 45 x 36 x 20 | Free |
Weight Limit
No weight limit for carry-on or personal item
Carry-On Fee Details
Free for all fares — always
Overhead bin access: All passengers get full overhead bin access. No fare restrictions.
Personal Item Rules
Size: 18 x 14 x 8 inches (45 x 36 x 20 cm). Examples: Purse, briefcase, backpack, laptop bag (must fit under seat)
Additional Items Allowed (Free)
- Coat or jacket
- Umbrella
- Food and beverages
- Reading material
- Assistive devices
- Child car seat (if child has ticket)
How Strictly Are Rules Enforced?
Lenient. Southwest has the most generous carry-on size (24x16x10) and rarely enforces strictly.
Expert Tips
- Southwest allows the largest carry-on of any US airline (24x16x10 vs 22x14x9)
- No weight limit means you can pack as heavy as you can lift
- Checked bags cost $45 (first) and $55 (second) — Rapid Rewards cardholders get free bags
- Board early (A group) to guarantee overhead bin space on full flights
Carry-On Packing Checklist
Before heading to the airport, ensure your carry-on meets Southwest Airlines's requirements:
- Measure your bag: must be within 24 x 16 x 10 inches including handles and wheels
- Weigh your bag: No weight limit for carry-on or personal item
- Personal item fits under the seat: 18 x 14 x 8 inches max
- Liquids in 3-1-1 compliant bag (containers 100ml or less, one quart-size clear bag)
- Electronics accessible for security screening
- No prohibited items (sharp objects, large liquids, flammable materials)
Frequently Asked Questions
- What size carry-on does Southwest Airlines allow?
- Southwest Airlines allows a carry-on bag up to 24 x 16 x 10 inches (61 x 41 x 25 cm).
- Is carry-on free on Southwest Airlines?
- Free for all fares — always
- What is Southwest Airlines's personal item size?
- Personal item must be 18 x 14 x 8 inches. Examples: Purse, briefcase, backpack, laptop bag (must fit under seat)
- Does Southwest Airlines weigh carry-on bags?
- No weight limit for carry-on or personal item