Personal Item
Allegiant Air45 x 35 x 20 cm
Frontier Airlines18 x 14 x 8 in
Allegiant Air vs Frontier Airlines baggage rules
United States
A source-backed comparison of Allegiant Air and Frontier Airlines personal item and carry-on limits, fare conditions and weight rules.
Quick verdict
Frontier Airlines is dimensionally more generous; Allegiant Air is stricter for this bag type. Frontier Airlines's published frame contains Allegiant Air's listed size.
Personal item and carry-on side by side
| Bag type | Allegiant Air | Frontier Airlines | Dimensional result |
|---|---|---|---|
| Personal Item | 45 x 35 x 20 cm Weight not listed Included · All fares | 18 x 14 x 8 in Max 35 lb Included · Basic | Frontier Airlines is dimensionally more generous; Allegiant Air is stricter for this bag type. Frontier Airlines's published frame contains Allegiant Air's listed size. |
| Carry-on | 55 x 40 x 25 cm Varies by fare Check fare conditions · Paid carry-on | 24 x 16 x 10 in Max 35 lb Check fare conditions · Add-on or eligible bundle/status | Frontier Airlines is dimensionally more generous; Allegiant Air is stricter for this bag type. Frontier Airlines's published frame contains Allegiant Air's listed size. |
Source match date
Source checkedPublished dimensions were matched to the source within four months; verify ticket and weight conditions before travel.
Source match date Aug 7, 2026
Relative published size frames
Carry-on
Allegiant Air55 x 40 x 25 cm
Frontier Airlines24 x 16 x 10 in
Bar area is a simple volume comparison for orientation only. Airline sizers enforce each edge separately; volume alone cannot prove that a bag fits.
Official policy sources
Explore the published size limits
Common questions before you pack
Frontier Airlines is dimensionally more generous; Allegiant Air is stricter for this bag type. Frontier Airlines's published frame contains Allegiant Air's listed size. Compare both rows because personal-item and overhead-bag results can differ. Fare and weight rules remain separate from dimensions.
Possibly, but only if every packed edge fits both airlines' current limit and your fares include that item. Use the prefilled comparison, then verify both official sources.
Not necessarily. Inclusion can depend on the fare, route, cabin or add-on even when the dimensions fit. The table shows the published inclusion status; your ticket controls the final allowance.