Best Carry-On for Southwest Airlines 2026 — What Actually Fits
By TripLab Editors · Updated September 2026 · 11 min read
Southwest Airlines has the most generous carry-on policy of any major US airline — up to 10 x 16 x 24 inches, no charge, plus a free personal item. That's roughly 2 inches longer and 2 inches wider than Delta, United, or American allow. In practice, it means more bags qualify as Southwest carry-ons than you might expect, and you never pay a fee for them.
This guide covers exactly what fits, which carry-ons are worth buying specifically for Southwest, and what happens when bins fill up before you board.
Southwest carry-on rules at a glance
- Size limit: 10 x 16 x 24 inches (including wheels and handles)
- Fee: $0 — carry-ons are always free on Southwest
- Personal item: 1 allowed, must fit under the seat
- Checked bags: First 2 also free — one of the best bag policies in the industry
- Gate check: Free if bins are full; bag typically at jetway on arrival
How Southwest's size limit compares to other airlines
| Airline | Max Carry-On Size | Carry-On Fee |
|---|---|---|
| Southwest | 10 × 16 × 24 in | Free |
| Delta | 22 × 14 × 9 in | Free (most fares) |
| United | 22 × 14 × 9 in | Free (most fares) |
| American | 22 × 14 × 9 in | Free (most fares) |
| Spirit | 22 × 18 × 10 in | $39–$99 |
Our top 3 carry-ons for Southwest
1. Best overall — Travelpro Platinum Elite 21"
Travelpro Platinum Elite 21" Carry-On
~$415
The Travelpro Platinum Elite 21" is the carry-on that airline crews choose for their own travel — and they know better than anyone what survives daily use across multiple airports. At approximately 22 × 14 × 9 inches packed, it fits easily within Southwest's limit and in overhead bins on every 737 variant Southwest operates. The 8-wheel spinner system rolls with almost no effort on smooth airport floors. The lifetime warranty is real and honored. If you fly Southwest more than 6–8 times per year, this is the carry-on to own.
2. Best budget — Travelpro Maxlite Air V2
Travelpro Maxlite Air V2 Carry-On
~$150
The Travelpro Maxlite Air V2 is Travelpro's lightweight value line. It gives you the same brand engineering at $150 instead of $415. The trade: 4 wheels instead of 8, no leather accents, lighter-duty construction. For occasional Southwest flyers — 3–6 trips per year — it's excellent value. Fits within Southwest's limit with room to spare.
Check Price on Amazon →3. Best premium — TUMI 19 Degree
TUMI 19 Degree Hardside Carry-On
~$750
If budget is not the deciding factor, the TUMI 19 Degree is the premium standard. Polycarbonate hardshell, TUMI's Titan wheels, a build quality that handles years of frequent flying without degrading. It fits Southwest's carry-on limit. At $750, it is an investment — but for heavy Southwest flyers who want their carry-on to last a decade, it earns its cost.
Check Price on Amazon →How to avoid gate check on Southwest
Southwest uses open seating — no assigned seats. Boarding position determines bin access. The A group boards first and gets first choice of overhead bins. The C group boards last and faces the highest gate-check risk on full flights.
- Buy Early Bird Check-In ($15–$25) for automatic A/B group positioning
- Check in exactly at the 24-hour window (set an alarm) for the best free boarding position
- Fly off-peak — midweek flights and early morning departures fill less frequently
- Use a personal item for anything you need during the flight; put carry-on overhead immediately on boarding
If you do get gate-checked, Southwest handles it well — your bag arrives at the jetway on landing, no baggage claim required, and there's no fee.
TripLab Verdict
Southwest's carry-on policy is the best in US domestic aviation — free, generous dimensions, no surprises. For most Southwest flyers, the Travelpro Platinum Elite 21" is the correct carry-on: airline-grade durability, proven fit, and a lifetime warranty that makes it the last carry-on you'll need to buy. Budget travelers get the same Travelpro quality at $150 with the Maxlite Air V2.