Allegiant Air Carry-On Rules & Bag Size Guide 2026

Allegiant Air is a US ultra-low-cost carrier (ULCC) headquartered in Las Vegas, Nevada, operating a point-to-point network focused primarily on leisure travel from small and medium-sized US cities to vacation destinations. Founded in 1997, Allegiant connects over 130 destinations in the continental United States, the Bahamas, and Mexico, primarily using an Airbus A319 and A320 fleet. Allegiant's business model is built around very low base fares and unbundling nearly every service — seat selection, checked bags, carry-on bags, priority boarding, and even drinks on board are charged separately. Understanding what is and is not included in your fare before arriving at the airport is essential.

Allegiant Air Carry-On Allowance at a Glance

Fare Type	Carry-On Bag	Personal Item	Carry-On Status
Standard (base fare)	22 × 16 × 10 in	7 × 15 × 16 in	Must purchase separately
Allegiant Extra	22 × 16 × 10 in	7 × 15 × 16 in	Included in bundle
Trip Flex add-on	22 × 16 × 10 in	7 × 15 × 16 in	Does not include carry-on

The critical point: Allegiant's base fare does not include a carry-on bag. This is different from Spirit Airlines (which also charges for carry-ons) and more restrictive than Frontier Airlines (which includes no carry-on on the lowest base fare). If you bring an overhead carry-on bag and have not paid for it, you will be charged at the airport — at rates significantly higher than online prices.

Carry-On Bag Dimensions

Measurement	Inches	Centimetres
Length	22 in	56 cm
Width	16 in	40 cm
Height	10 in	25 cm
Max Weight	40 lbs	18 kg

The 22 × 16 × 10 inch limit is identical to the most common US domestic carry-on standard and accommodates the same bags accepted by Southwest, United, American, and Delta. The 40 lbs (18 kg) weight limit is extremely generous — effectively a non-issue for most travellers, as most carry-on bags weigh well under 18 kg even when fully packed.

Free Personal Item Dimensions

Measurement	Inches	Centimetres
Length	16 in	41 cm
Width	15 in	38 cm
Height	7 in	18 cm

The free personal item is what fits under the seat in front of you — a small backpack, purse, tote bag, or laptop bag. Note that the dimensions differ from the carry-on: the personal item is shorter and shallower. Items that clearly exceed these dimensions (such as a standard laptop backpack with a 17-inch laptop compartment) may be challenged and redirected as a charged carry-on.

Fee Structure — Carry-Ons, Checked Bags, and Gate Fees

Allegiant's fee structure is tiered by when you pay. Booking online in advance is always cheapest:

Item	Online (at booking)	Online (before day of)	Airport/Gate
Carry-on bag (per flight)	~USD 10–30	~USD 15–40	~USD 50–75
Checked bag (40 lbs)	~USD 10–30	~USD 15–45	~USD 50–75
Additional checked bag	Higher	Higher	Premium

Prices vary by route, season, and booking window. Always check current fees on Allegiant's website.

Gate fees for carry-on bags — charged when staff discover an unpaid overhead bag at the gate — are typically in the range of USD 50–75 per bag per flight. On a round trip, bringing an unpaid carry-on can cost USD 100–150 in gate fees, which often exceeds the original base fare.

Allegiant Extra — The Bundle That Includes a Carry-On

Allegiant Extra is Allegiant's fare bundle that includes several services for a single upfront price. As of 2026, Allegiant Extra typically includes:

• One carry-on bag (22 × 16 × 10 in)
• One checked bag (up to 40 lbs)
• Priority boarding
• No fee to change or cancel

For travellers who know they want a carry-on, Allegiant Extra is often comparable to or cheaper than purchasing a carry-on separately, especially when combined with the checked bag and priority boarding inclusions. Compare the bundle price against the sum of individual add-ons to find the better value.

Tips for Allegiant Air Passengers

Add your carry-on online immediately. If you need an overhead carry-on, add it to your booking at the time of purchase. The pricing window is dynamic — fees rise as departure approaches. Adding a carry-on the night before your flight costs more than adding it at booking. Waiting until the airport gate is the most expensive option by far.

The personal item size limit is real. Allegiant enforces the personal item limit at the gate, particularly on busy routes. A large backpack or oversized tote will be charged as a carry-on. If you are travelling on the base fare and want to avoid all bag fees, use a genuinely small bag — a slim backpack, a handbag, or a laptop messenger bag.

Allegiant operates from secondary airports. A core part of Allegiant's model is using less-congested secondary airports — Sanford (SFB) instead of Orlando (MCO), St. Pete-Clearwater (PIE) instead of Tampa (TPA), Bellingham (BLI) instead of Seattle (SEA). These airports are typically smaller, easier to navigate, and have shorter security queues, but they require ground transport to reach final destinations.

Check bag weight at home. While the 40 lbs (18 kg) carry-on weight limit is very generous, Allegiant's checked bag limit is also 40 lbs — lower than the 50 lbs (23 kg) standard at American, Delta, and United. If you are checking bags on Allegiant, pack to 40 lbs, not 50 lbs.

Priority boarding is worthwhile on Allegiant. Unlike legacy carriers where overhead bin space is usually adequate, Allegiant's smaller gate staff and compact operations mean bins fill quickly. Priority boarding (included in Allegiant Extra or purchasable separately) guarantees overhead space near your seat. Without it, late boarders may find bins full even with a correctly purchased carry-on.

Allegiant's route map focuses on leisure destinations. Las Vegas (LAS), Orlando (SFB), Tampa Bay (PIE), Punta Gorda (PGD, for Fort Myers), Myrtle Beach (MYR), and similar leisure spots dominate. The airline has limited corporate travel, which means most passengers are leisure travellers with luggage needs — enforcement of the no-carry-on-on-base-fare policy is taken seriously because it is a material revenue source.

The Bottom Line

Allegiant Air offers genuinely low base fares, but those fares do not include a carry-on bag. If you are travelling with anything more than a personal item that fits under the seat, you must purchase carry-on access. Add it at booking — not at the airport, where fees can reach USD 50–75 per flight. The Allegiant Extra bundle is often the best value if you need both a carry-on and a checked bag. The size limits (22 × 16 × 10 in) are generous and match standard US domestic carry-on dimensions, so your existing bag will likely fit — you just need to pay to bring it.

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Rules change — always verify with Allegiant Air before you fly.