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Allegiant Air Carry-On and Personal Item Size

Checked against Allegiant Air's baggage pages on October 7, 2026

Allegiant Air allows a carry-on of up to 10 x 16 x 22 in (25 x 40 x 55 cm), including wheels and handles. The personal item can be up to 8 x 14 x 18 in (20 x 35 x 45 cm). Only the personal item is free; the carry-on costs extra.

Bag size, with wheels and handles
AirlinePersonal itemCarry-on
AllegiantPersonal item: FitsCarry-on: FitsCosts extra ($10 to $75)
FrontierPersonal item: FitsCarry-on: FitsCosts extra unless your bundle includes it
Sun CountryUnderseat item: 1 in over on length (max 17 in); 1 in over on width (max 13 in)Overhead bag: FitsCosts extra
SouthwestPersonal item: No size publishedCarry-on: Fits

Your longest side is compared with each airline's longest limit, and so on. Weight is checked only where the airline publishes a limit. "No size published" means the bag just has to fit under the seat in front of you.

Allegiant Air carry-on size

Inches10 x 16 x 22 in
Centimeters25 x 40 x 55 cm
WeightNo limit published
Included?Costs extra ($10 to $75)

Allegiant Air gives a roll-aboard bag, garment bag or tote bag as examples.

Allegiant Air personal item size

Inches8 x 14 x 18 in
Centimeters20 x 35 x 45 cm
WeightNo limit published

Personal item examples from Allegiant Air: a purse, briefcase, laptop computer, small backpack, small camera or food container.

Does Allegiant Air charge for carry-on bags?

Yes.Costs extra ($10 to $75).

  • One personal item is free. A carry-on bag costs $10.00 to $75.00, priced by route and by when you add it.

More Allegiant carry-on rules

  • All measurements include wheels, pockets, handles and decorations, and the personal item must fit completely under the seat in front of you.
  • Oversized personal items and excess carry-on bags are charged an at-airport baggage fee of $50.00 to $75.00.
  • A gate-checked bag costs $0.00 to $75.00. Car seats, strollers, mobility aids and assistive devices are free.

Is a backpack a Allegiant personal item?

Yes, if it fits: Allegiant Air lists a small backpack among its personal item examples. Measure it packed, including straps and side pockets, against 8 x 14 x 18 in (20 x 35 x 45 cm). Our travel backpack picks, by their makers' measurements:

BackpackAs personal itemAs carry-on
Peak Design Travel Backpack 45Lstandard (35L), 22 x 13 x 9.5 in4 in over on length (max 18 in); 1.5 in over on depth (max 8 in)Fits
Peak Design Travel Backpack 45Lexpanded (45L), 22 x 13 x 11 in4 in over on length (max 18 in); 3 in over on depth (max 8 in)1 in over on depth (max 10 in)
Osprey Farpoint/Fairview Travel Daypackdetachable 15L daypack, 18.1 x 12.2 x 8.3 in0.1 in over on length (max 18 in); 0.3 in over on depth (max 8 in)Fits

Allegiant vs Frontier vs Sun Country vs Southwest carry-on size

AirlinePersonal itemCarry-onFree carry-on?
Allegiant8 x 14 x 18 in(20 x 35 x 45 cm)10 x 16 x 22 in(25 x 40 x 55 cm)Costs extra ($10 to $75)
Frontier14 x 18 x 8 in(36 x 46 x 20 cm)24 x 16 x 10 in(61 x 41 x 25 cm)Costs extra unless your bundle includes it
Sun Country17 x 13 x 9 in(43 x 33 x 23 cm)24 x 16 x 11 in(61 x 41 x 28 cm)Costs extra
SouthwestNot published24 x 16 x 10 in(61 x 41 x 25 cm)All fares

Compare every airline, including international carriers, in the carry-on size checker.

Sources

Limits are from each airline's own pages, checked October 7, 2026. Airlines change bag rules often, so check before you fly. Conversions use 1 inch = 2.54 cm. Backpack sizes are from the manufacturers.