How to Add a Pet to an Allegiant Flight (Step-by-Step Guide)

Adding a pet to an Allegiant Air flight requires advance planning and direct confirmation, as Allegiant does not allow pets to be added online and strictly limits the number of pets allowed per aircraft. Unlike some airlines that let travelers manage pet travel digitally, Allegiant treats pets as a special service that must be manually added to the reservation before arriving at the airport. If a pet is not properly registered in advance, Allegiant may deny boarding—even if the traveler is willing to pay the pet fee at check-in. This guide explains exactly how to add a pet to an Allegiant flight, when to do it, and what to expect after your pet is added, without repeating full policy or fee details already covered elsewhere.

Quick Answer: How Do I Add a Pet to an Allegiant Flight?

To add a pet to an Allegiant flight, you must call Allegiant Air Reservations at 702-505-8888 and inform the agent that you are traveling with a pet. Allegiant does not allow pets to be added online, and pet space is limited per flight. Many travelers also confirm availability, eligibility, and timing in advance through the Allegiant flights help center desk at +1 (866) 558-3017 to avoid last-minute issues.

How to Add a Pet to an Allegiant Reservation

Allegiant requires all pet bookings to be handled by phone, even if your flight was booked online.

Step-by-Step Process

1. Book your Allegiant flight first using your preferred method.

2. Call Allegiant Air at 702-505-8888 as soon as your booking is confirmed. Alternatively, Reach us at +1 (860) 558-3017 for immediate and adding you pet easily.

3. Tell the agent you are traveling with a pet and want to add it to your reservation.

4. The agent will do as follow below:
   4.1. Check whether pet space is available on your specific flight
   4.2. Confirm basic eligibility
   4.3. Add the pet to your booking if space allows

5. You’ll receive confirmation that your pet is registered for the flight.

Because Allegiant allows only a limited number of pets per aircraft, waiting too long to call is one of the most common reasons pets cannot be added. To avoid Allegiant Busy line, Reach to the fastest Reservations help desk at +1-866-558-3017.

How Much Does Allegiant Charge to Add a Pet?

Allegiant charges a pet fee per direction, and the cost depends on when you add your pet to the reservation. If the pet is added in advance, Allegiant typically charges $75 per one-way flight. For walk-up requests at the airport, the fee increases to $100 per direction, provided pet space is still available. The fee applies only to in-cabin pets on domestic flights and is non-refundable.

Explore more About Allegiant Air Pet Fee 

Can I Add a Pet to My Allegiant Flight After Booking?

Yes, you can add a pet after booking, but only if pet space is still available on your flight. Allegiant does not hold pet slots automatically, and availability can disappear quickly—especially on popular domestic routes. Travelers who book their flight first and delay adding a pet often find that pet slots are already full.

Pro Tips: To avoid this risk, many passengers confirm pet availability immediately by calling +1 (866) 558-3017 before finalizing their travel plans.

How to Add a Pet to an Allegiant Flight (Domestic Travel Only)

Allegiant pet travel is limited to domestic flights within the United States. When adding a pet to a domestic Allegiant flight:

• The pet must travel in the cabin only
• Pets cannot be added for international routes
• Pets must be registered before arriving at the airport

If any portion of your itinerary includes a non-eligible route, Allegiant will not allow the pet to be added.

Does a Pet Count as a Carry-On on Allegiant?

Yes. When you add a pet to an Allegiant flight, the pet carrier counts as your carry-on item. This means:

• You cannot bring an additional standard carry-on bag
• You may still bring a personal item, depending on your fare

This rule is enforced at check-in and boarding, which is why Allegiant requires pets to be added manually to the reservation rather than online.

Read Also → How Strict is Allegiant Carry on Pet Policy?

How Strict Is Allegiant When Adding Pets?

Allegiant is fairly strict when it comes to pet registration and enforcement. Adding a pet to the reservation does not override airport checks, and final approval always happens in person.

Allegiant enforces:

• Advance pet registration
• Limited pets per flight
• Carrier size checks at the airport

If a pet is not properly added in advance or does not meet requirements at check-in, Allegiant may deny travel.

Does Allegiant Require a Health Certificate to Add a Pet?

For most domestic Allegiant flights, a health certificate is not routinely required to add a pet. However:

• Pets must appear healthy at check-in
• Airline staff may deny travel if there are visible health concerns

While not mandatory in most cases, carrying basic vaccination records is still recommended.

What If I Need Help Adding a Pet to Allegiant?

If you are unsure about:

• Limited pet space
• Domestic route eligibility
• Booking timing
  Carrier enforcement at the airport

You can contact Allegiant Air directly at 702-505-8888, or get step-by-step booking assistance through +1 (866) 558-3017, especially if your travel date is approaching.

Conclusion

Adding a pet to an Allegiant flight is simple—but only if it’s done correctly and early. Allegiant does not allow online pet additions, strictly limits pets per flight, and requires advance registration by phone. Travelers who call early, confirm availability, and understand carry-on enforcement rules are far more likely to experience smooth pet travel without surprises at the airport.

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