Allegiant Air allowance at a glance
| Bag | Maximum size | Maximum weight | Notes |
|---|---|---|---|
| Carry-on | 22x16x10 in55x40x25 cm | No stated limit | A carry-on is not free on most Allegiant fares. It is a paid add-on published at $10 to $75 depending on route and when you buy it, and is included only with bundles that cover it. No carry-on weight limit is published. |
| Personal item | 18x14x8 in45x35x20 cm | No stated limit | One personal item is free on every fare and must fit under the seat. |
| Checked bag | 80 in203 cm | 50 lb22 kg |
This page goes deeper on one part of the policy. The full record is at Allegiant Air Baggage Rules.
Allegiant personal bag dimensions top out at 18 by 14 by 8 inches, or 45 by 35 by 20 cm. That bag rides free on every fare Allegiant sells. Nothing else does.
On this airline the personal item is not a courtesy add on to a paid carry-on. It is the only bag included in the ticket price.
Knowing the Allegiant personal bag dimensions matters more here than on a legacy airline, where a full carry-on comes standard. The full Allegiant baggage rules cover the carry-on and checked side of that trade.
What counts as the free bag
The Allegiant personal bag dimensions apply to one bag per traveler. A purse, a briefcase, a laptop case or a camera case all qualify. Each must slide completely under the seat in front of you.
Bring a backpack and a tote and the second one turns into a carry-on with a fee attached. Allegiant does not publish a weight limit for the personal item, only the size box. An overstuffed bag is a fit problem first, not a weight problem.
Is it free on every fare
Yes. Allegiant’s baggage page states the personal item carries no charge for any passenger. That is not true of the carry-on.
A full size carry-on at 22 by 14 by 10 inches is a paid add on. It runs from about 10 to 75 dollars, depending on route and how early you buy it. It is cheapest at booking and priciest at the airport.
The personal item skips that pricing ladder entirely. That split is common among budget carriers. Frontier runs the same free personal item next to a paid carry-on, and its Frontier personal item box asks a similar bag to do similar work.
What happens when it does not fit
Allegiant’s own wording is blunt. A personal item that will not stow completely under the seat gets treated as a carry-on bag, and carry-on fees apply.
At the gate that means airport pricing, the top of that 10 to 75 dollar range.
A gate agent is not measuring the bag with a tape. On a full flight the real test is whether it slides under the seat ahead without a shove.
A jacket draped over the top or a bottle jammed in a side pocket is usually what pushes a bag from fitting to not fitting. Packing those extras inside the main compartment is the cheap fix. Paying at the gate is the expensive one.
Bags that fit the Allegiant personal item box
A bag cut to the box beats one that is merely small. Allegiant’s Airbus fleet does not offer much under seat space. These fit the 18 by 14 by 8 inch limit by the maker’s own stated dimensions.
| Bag | Maker’s dimensions | Fit against the box |
|---|---|---|
| Narwey personal item bag | 18 x 14 x 8 in | Cut to this exact box, and it squashes down further if the gate space runs tight |
| Bagsmart personal item travel bag | 17 x 13 x 6 in | Under the limit on all three sides, with a trolley sleeve for a rolling carry-on |
| WANDF foldable personal item | 17.7 x 13.8 x 7.9 in | Just inside the box, and it folds flat for the trip home when it is not full |
A stiff structured tote or a boxy backpack that measures close to the limit empty is the riskier buy. It has less give than a soft bag once loaded. Manufacturer specs are worth checking, since customer reviews commonly mention a listed size running generous once the bag is packed.
The bottom line
Allegiant personal bag dimensions of 18 by 14 by 8 inches define the one bag that flies free on every fare. Pick a bag built to that box rather than one that merely claims to fit.
Read the same split on the personal item versus carry-on guide before booking any add on. It helps to learn how to measure carry-on luggage the same way a gate agent would. Check the Allegiant carry-on size page too if the add on ever gets bought.
Common questions
How big is the Allegiant personal item
It measures 18 by 14 by 8 inches, or 45 by 35 by 20 cm, and must fit completely under the seat in front of you.
Is the personal item free on Allegiant
Yes, it is free on every fare Allegiant sells, unlike the carry-on bag, which is a paid add on.
What counts as a personal item on Allegiant
A purse, a briefcase, a laptop case or a camera case are the airline’s own examples, and any small bag of similar size generally works.
What happens if my personal item is too big at the gate
Allegiant treats it as a carry-on bag and charges the airport carry-on fee, which sits at the top of the airline’s pricing range.
Does Allegiant weigh the personal item
The airline publishes no weight limit for the personal item, only the size box, so fit matters more than weight.
How much does an Allegiant carry-on cost if my personal item does not fit
Allegiant prices the carry-on from about 10 to 75 dollars, cheapest at booking and most expensive at the airport.
Some links on this page are Amazon affiliate links. If you buy through one, Carry On Sizes may earn a commission at no extra cost to you. It never changes what we recommend. How this works.