United Airlines vs Southwest Airlines
Cabin baggage rules side by side, and the safe bag size for both.
 United Airlines |  Southwest Airlines | |
|---|---|---|
| Free bag size | 56 × 35 × 22 cm | 61 × 41 × 25 cm |
| Weight limit | — | — |
| Free cabin bag? | Yes | Yes |
Verdict
Southwest Airlines is more generous — its free allowance (61 × 41 × 25 cm) is larger than United Airlines's (56 × 35 × 22 cm).
Safe size for both
56 × 35 × 22 cm
Fits the free allowance of both airlines.
FAQ
Is United Airlines or Southwest Airlines stricter on cabin bags?+
Southwest Airlines is more generous — its free allowance (61 × 41 × 25 cm) is larger than United Airlines's (56 × 35 × 22 cm).
What bag fits both United Airlines and Southwest Airlines?+
To be safe on both, choose a bag no larger than 56 × 35 × 22 cm. That fits inside the free allowance of each airline.