Allegiant Air vs Southwest Airlines
Cabin and carry-on baggage limits for Allegiant Air and Southwest Airlines, side by side.
⚠ These figures are awaiting manual verification against the airline's official page. Treat them as preliminary.
Southwest Airlines allows the larger carry-on — its longest side is 61 cm, versus 55 cm for Allegiant Air.
Allegiant Air is more generous for personal items — up to 45 cm, versus 41 cm on Southwest Airlines.
Check your bag
Enter your bag's dimensions to see how it fares against both airlines' carry-on limits.
| Airline | Verdict | Fits as | Margin | Checked on | Source |
|---|
Enter your bag's size above to see which airlines accept it.
- Max dimensions
- 25 × 40 × 55 cm
- Total linear
- Not published
- Weight limit
- Not published
- Pieces
- 1
- Max dimensions
- 61 × 41 × 25 cm
- Total linear
- Not published
- Weight limit
- Not published
- Pieces
- 1
Cabin & carry-on allowances
| Allowance | Allegiant Air | Southwest Airlines |
|---|---|---|
| carryOn | 25 × 40 × 55 cm · Not published · Not published · 1 pc Must fit in the overhead bin unaided Paid option, not included on the base fare Carry-on bag up to 25x40x55 cm. It is a paid option with no published weight limit and is not included on the base fare. | 61 × 41 × 25 cm · Not published · Not published · 1 pc Free on all fares No published weight limit Carry-on up to 61x41x25 cm (24x16x10 in); free on all fares, no weight limit published. |
| personalItem | 20 × 35 × 45 cm · Not published · Not published · 1 pc Must fit under the seat in front of you Free on all fares One free personal item up to 20x35x45 cm (8x14x18 in); included on all fares. | 41 × 34 × 20 cm · Not published · Not published · 1 pc Free on all fares No published weight limit Personal item up to 41x34x20 cm (16.25x13.5x8 in); free on all fares. |
Sources
Southwest Airlines
Carry-On Baggage - Southwest Airlines Official · unverified Last checked: 2026-10-11