What Are the Pet Carrier Size Requirements on Allegiant Air?

Flying with your pet can be an exciting adventure, but it starts with understanding the pet carrier size requirements on Allegiant Air. Whether you’re planning a vacation or relocating with your furry companion, making sure your carrier meets airline guidelines is a crucial step.

In this guide, we’ll walk you through Allegiant Air’s pet travel rules, approved carrier dimensions, and tips for a smooth journey—all tailored to help you fly confidently with your pet.

Understanding the Pet Carrier Size Requirements on Allegiant Air

Before booking your flight, it’s important to understand how Allegiant Air handles pets in the cabin. Under the Allegiant pet policy, only small domestic cats and dogs are permitted, and they must travel in an approved pet carrier that fits under the seat in front of you. The carrier is considered your personal item, so plan accordingly if you also need a carry-on.

Allegiant does not transport pets in the cargo hold, so if your pet doesn’t fit in an in-cabin carrier, flying may not be an option with this airline.

Approved Pet Carrier Dimensions and Design Guidelines

To ensure your pet can board without any issues, Allegiant Air requires that pet carriers meet the following size limits:

• Maximum dimensions: 9 inches high x 16 inches wide x 19 inches deep
  (22.9 cm x 40.6 cm x 48.3 cm)
• The carrier must fit completely under the seat in front of you.
• Only soft-sided pet carriers are recommended, as they offer more flexibility in tight cabin spaces.
• Your pet must be able to stand up and turn around comfortably inside the carrier.

It’s essential that the carrier is well-ventilated, secure, and leak-proof to ensure both your pet’s safety and the comfort of nearby passengers.

Choosing the Right Carrier: Why Soft-Sided Is Best

Allegiant specifically recommends soft-sided carriers for cabin travel. These are more forgiving when fitting under seats, and they often include features that improve airflow and comfort.

ibiyaya offers a range of soft-sided pet carriers that comply with Allegiant’s sizing guidelines. Their carriers are not only lightweight and collapsible, but they’re also stylish and durable—making them a favorite among frequent pet travelers. Look for models with padded interiors, breathable mesh panels, and shoulder straps for easier airport navigation.

How to Book a Flight With Your Pet on Allegiant

Bringing your pet along requires a little extra planning. Here’s how to book correctly:

Step 1: Reserve Early

Allegiant allows only a limited number of pets per flight, so be sure to book your pet’s spot early. You can do this during your online booking or by calling customer support.

Step 2: Pet Fee

A $50 fee per segment applies when you fly with a pet. This fee is non-refundable and due at booking or check-in.

Step 3: Always Consider Seating Restrictions

Passengers with pets are not permitted to sit in:

• • Exit rows
  • Bulkhead seats
  • Rows with inflatable seat belts

Your seat will need to accommodate the pet carrier under the seat in front of you, so be mindful when choosing your spot.

Editor’s Note: These steps might change, so always check with the airline before booking. 

In-Cabin Travel Tips for Allegiant Pet Passengers

Once you’ve booked your flight, use these pet travel tips to prepare for the journey:

Acclimate Your Pet to the Carrier

Get your pet used to spending time in the carrier several days before your trip. Place familiar blankets, toys, or treats inside to make it feel like a safe space.

Pack Smart

While your pet must remain in the carrier during the flight, it’s helpful to keep a few essentials in your carry-on:

• Collapsible water bowl
• Waste bags
• Travel-sized wipes
• A calming aid or familiar item from home

Visit the Vet (Optional but Smart)

Even though Allegiant doesn’t require health certificates, it’s a good idea to schedule a check-up before flying—especially if your pet is a nervous traveler or has health conditions.

ibiyaya is Perfect for Other Travel Scenarios

While most ibiyaya carriers do not meet Allegiant Air’s strict pet carrier size requirements—particularly the 9-inch height limit—they’re still excellent choices for a wide range of other travel situations where your pet’s comfort and safety matter just as much.

Many of our soft-sided carriers are built with extra headroom, ventilation, and ergonomic features that make them ideal for:

• Car travel and road trips
• Train rides and public transportation
• Vet visits where ease of access and comfort are key
• Flights on other domestic airlines with more generous under-seat allowances (such as Delta, United, Alaska, and JetBlue)

Top ibiyaya Picks for Alternative Travel

Here are some of our most popular carriers that may be too tall for Allegiant, but are perfectly suited for your everyday adventures:

🎒 Ultralight Dog Carrier Backpack

• Dimensions: 12″ L × 12″ W × 20″ H
• Best for: Train rides, vet visits, and flights on airlines with taller under-seat clearance.
• Why we love it: Lightweight, breathable mesh panels, and padded shoulder straps make it easy to carry on foot or on the go.

🎒 4-in-1 Pet Carrier (Stroller + Backpack + Car Seat + Carrier + Roller Bag)

• Dimensions (Carrier only): 13″ L × 11″ W × 20″ H
• Best for: Multi-modal travel where flexibility is key
• Why we love it: A true all-in-one solution that adapts to any journey—from rolling through the airport to strapping into the backseat.

Travel Comfortably, Wherever You’re Headed

Even if you’re not flying Allegiant, ibiyaya carriers are thoughtfully designed to offer flexibility, durability, and pet-friendly features for almost any journey. Whether you’re headed to the vet or hopping on a train, you’ll find a carrier that matches your lifestyle—and your pet’s personality.

Final Thoughts

Flying with your pet on Allegiant Air can be a smooth, stress-free experience as long as you understand the carrier rules and prepare in advance. From knowing the Allegiant pet policy to choosing the right carrier and planning your seating, a little preparation goes a long way. Always prioritize your pet’s comfort and safety by selecting a soft, breathable carrier like those offered by ibiyaya.

Disclaimer: Airline policies can change without notice. Always check directly with Allegiant Air for the latest pet carrier size requirements and travel regulations before your trip.