Spirit Airlines Pet Policy 2025: What Pet Owners Must Know Before Booking

Traveling with a pet turns a routine flight into a joint adventure, but Spirit Airlines maintains one of the most narrowly defined pet policies in the U.S. budget sector. The airline permits only a small set of domesticated animals in the cabin on domestic routes. There is no cargo hold or checked‑baggage pet service, no international acceptance, and strict limits on carrier size, pet weight, and onboard conduct. This comprehensive guide interprets the 2025 Spirit pet policy in plain language, covering every detail from eligible species and carrier dimensions to fees, documentation, and the step‑by‑step booking process. You will also find training strategies, airport navigation tips, and concrete alternatives if your companion simply cannot fly Spirit.

Which Pets Are Allowed to Fly in the Cabin?

Spirit accepts only a few types of small, domesticated animals, and only on flights that stay entirely within the 50 United States. The policy does not distinguish between breeds, but the animal must fit comfortably inside a single carrier and follow the weight rules. These are the only approved species:

  • Small dogs. All breeds are technically eligible, but the dog must be able to stand up, turn around, and lie down naturally inside the carrier with the top closed. Snub‑nosed breeds such as pugs, bulldogs, and Persian cats are not banned outright; however, gate agents may deny boarding if they observe any sign of breathing difficulty, even mild panting, because cabin pressure shifts can quickly turn a small respiratory issue into a medical emergency.
  • Domestic cats. Any house cat qualifies, provided it is healthy and secure. Like dogs, cats must remain inside their carrier for the entire flight.
  • Small household birds. Species such as parakeets, canaries, cockatiels, and lovebirds are allowed. The bird must be in a fully enclosed, well‑ventilated carrier that prevents escape. Important exception: Birds are not allowed on any flight to or from Puerto Rico or the U.S. Virgin Islands due to local agricultural regulations.
  • Small domestic rabbits. Rabbits are welcomed on most routes, but they fall under the same U.S. territory restrictions as birds. You cannot bring a rabbit on any itinerary that includes Puerto Rico or the U.S. Virgin Islands.

All other animals—including reptiles, amphibians, rodents (hamsters, guinea pigs, mice), ferrets, hedgehogs, spiders, insects, and any type of livestock—are strictly prohibited. Emotional support animals are no longer recognized by Spirit; only trained service dogs meeting federal requirements travel free of charge as an accommodation for a disability.

Strict Limits You Must Observe

Spirit enforces every rule at check‑in and at the gate, and there is no flexibility for borderline cases. Before you book, confirm that you can meet each of the following conditions:

  • Route restrictions: Pets are accepted solely on domestic flights. Any itinerary that includes a segment outside the 50 states—even a connection in San Juan, Puerto Rico, where rabbits and birds are prohibited—will make the entire trip ineligible. If you are flying to a U.S. territory, check the specific rules for that destination; Spirit’s general pet window closes for any flight touching a restricted area.
  • Pet count per passenger: Each traveler may bring only one carrier. That single carrier can hold up to two pets of the same species, as long as both animals have enough room to move. If you have one dog and one cat, they require two separate carriers and two paying passengers.
  • Combined weight limit: The total weight of the pet plus the carrier cannot exceed 40 pounds (18.14 kg). Spirit agents may weigh the loaded carrier at the ticket counter. Even a 41‑pound unit will be turned away.
  • Minimum age: All pets must be at least 8 weeks old and fully weaned. No exceptions are made for younger animals, regardless of a veterinarian’s note.
  • Behavior standards: The animal must not bark, whine, growl, hiss, or show any sign of aggression or extreme distress. Flight crews have full authority to deny boarding or, in severe mid‑flight cases, require that the passenger and pet be removed from the plane without compensation.

Approved Carrier Specifications

Spirit’s under‑seat space determines the carrier dimensions, and gate agents will inspect every pet carrier before you step onto the aircraft. Use these requirements as your purchase checklist:

  • Maximum size: 18 inches long x 14 inches wide x 9 inches high (45.7 cm x 35.5 cm x 22.8 cm). Soft‑sided carriers are highly recommended because they can compress slightly to fit under seats that have a center support bar or electronics box that reduces clearance. Hard‑shell plastic kennels often will not fit in window or aisle seats on Spirit’s A319 and A320 aircraft.
  • Construction: The carrier must be leak‑proof, made of sturdy materials, and ventilated on at least two full sides. Mesh panels are acceptable as long as they are tear‑resistant and zippers can be secured with a clip or small lock to prevent the pet from working them open. Flooring should be solid enough that no claws can poke through.
  • Stowage position: The carrier must remain entirely underneath the seat in front of you for the entire flight, from boarding to deplaning. It cannot stick into the aisle, encroach on your seatmate’s foot area, or be placed on an empty seat, in the overhead bin, or on your lap.
  • Comfort standard: Inside the closed carrier, your pet must be able to stand up without touching the roof, turn completely around, and lie down in a natural curled position. If the animal looks cramped or cannot shift position, board‑ing may be denied.

If you are unsure about your carrier’s fit, place it next to a measuring tape and take a photograph. Having that image handy at the airport can quickly resolve a dispute. Avoid carriers with wheels that cannot be removed or stowed, as the wheel assembly often pushes the carrier over the height limit.

How to Book a Pet on Spirit Step by Step

Spirit caps the number of pets allowed in the cabin on each flight—usually between four and six carriers, depending on the aircraft type. Spots are assigned on a first‑come, first‑served basis, so booking early is non‑negotiable.

  1. Book your own passenger ticket first using the Spirit website, mobile app, or a travel agent.
  2. Immediately after your ticket is confirmed, add the pet as an “Add‑On.” You can do this during the online booking flow by selecting the pet option before payment, or you can visit the Spirit Airlines pet policy page and follow the links to modify your reservation. If you prefer, call Spirit’s customer service line to add the pet by phone.
  3. Pay the pet fee right away. The fee is per carrier, each way. As of 2025, the one‑way fee is generally around $125, but the exact amount can change. Always verify the current price on Spirit’s official fee chart or during the booking process; the fee you pay is the one in effect at the time of payment.
  4. After payment, you will receive an updated itinerary receipt that shows the pet has been added. Save this document digitally and have a printed copy with you at the airport.

If you fail to pay in advance, you may attempt to add the pet at the airport ticket counter, but the flight’s pet quota may already be full. Walk‑up additions are not guaranteed, and Spirit will not remove a human passenger or another pre‑paid pet to make room. Do not risk it.

Health and Documentation: What’s Required

For most purely domestic itineraries, Spirit does not demand a formal health certificate. However, there are critical exceptions and smart practices that every owner should follow.

  • Rabies vaccination for Puerto Rico: If your flight touches San Juan, you must present a valid rabies vaccination certificate signed by a licensed veterinarian. If the vaccine is the animal’s first dose, it must have been administered at least 30 days before the travel date. Keep the original paperwork, not a photo.
  • General fitness standard: Your pet must appear healthy, odor‑free, and free of external parasites. Gate agents can refuse any animal that has discharge from the eyes or nose, an open wound, a heavy odor, or visible skin irritation. A pre‑travel wellness check with your veterinarian, even when not required, can catch an ear infection or a dental issue that might cause pain during pressure changes.
  • Optional veterinary letter: Carrying a short note from your vet that states your pet is “fit for air travel,” lists any medications, and describes a non‑contagious condition (such as a healed surgical scar) can help prevent questions at the airport. The letter is not a guarantee of boarding, but it gives the airline a professional opinion to lean on.

Because Spirit does not transport pets on international flights, health certificates from the destination country’s consulate are irrelevant for Spirit tickets. If your journey includes an international leg on another airline, you must arrange separate transport for your pet outside of Spirit’s network.

Getting Your Pet Ready for the Flight

A calm pet is the result of weeks of deliberate preparation. Animals that are unaccustomed to a carrier, the hum of engines, or long periods of confinement often vocalize or panic, and that behavior can cause the crew to react. These strategies will raise the odds of a smooth flight.

Carrier Acclimation Training

Start by leaving the open carrier in a room where your pet frequently relaxes. Toss high‑value treats inside, feed meals near the entrance, and drape a soft blanket that carries your scent across the bottom. Once your pet willingly enters, close the door for 30 seconds while you sit nearby, then release and reward. Gradually increase the time with the door shut, building up to several hours over two to three weeks. Next, practice short car rides with the carrier belted in, then play airplane cabin noise from a phone speaker at low volume during training sessions. By the day of travel, the carrier should feel like a familiar den, not a trap.

Feeding, Water, and Bathroom Breaks

On travel day, offer a light, easily digestible meal no later than four hours before the flight’s scheduled departure time. This reduces the chance of nausea. Provide water freely until about two hours before you leave for the airport. Just before closing the carrier, give a few ice cubes or a small drink; an ice cube inside a clip‑on dish provides slow hydration without a slosh. Attach a shallow, spill‑resistant water cup to the carrier door so your pet can lap during a long layover, but know that it may still leak due to pressure changes. Line the carrier floor with an absorbent pee pad, then lay a thin fleece over it for comfort.

Calming Strategies Without Sedation

Never give your pet a sedative or over‑the‑counter human medication without explicit, written veterinarian instructions. The combination of altitude and sedation can dangerously depress breathing. Instead, use natural calming aids: a pheromone spray like Adaptil (for dogs) or Feliway (for cats), applied to the carrier bedding 15 minutes before closing, can lower anxiety. A snug anxiety wrap like a Thundershirt works for many small dogs and can be worn inside the carrier as long as it doesn’t restrict breathing. Introducing these aids several days ahead of time lets you observe your pet’s reaction without surprises at the airport.

Airline pet travel adds steps to the standard airport routine. Plan to arrive at least two hours before a domestic flight so you have the buffer needed for each checkpoint.

Check‑In Process

Go to the full‑service Spirit ticket counter, even if you have no luggage to check. An agent will confirm your pet reservation, visually inspect the carrier, and look at the animal. You may be asked to briefly unzip the carrier so the agent can see the pet without it leaving the bag. The agent will then attach a cabin pet tag to the carrier. Keep this tag visible throughout the journey.

Going Through Security

At the TSA screening area, you must take the pet out of the carrier and carry it through the metal detector while the empty carrier goes through the X‑ray machine. A harness or snug collar with ID tags is essential at this moment; the TSA does not compel a leash, but a firm grip on a harness keeps your pet from bolting in a crowded checkpoint. If your animal is likely to panic, you can request a private screening room. TSA officers will still need to swab the carrier, but the pet will be in a quieter, enclosed space. Review the TSA’s pet screening guidelines before you leave home so you know exactly what to expect.

At the Gate and Pre‑Boarding

Once through security, your pet must stay inside the closed carrier in the gate area. Notify the Spirit gate agent that you have a cabin pet; this ensures they know you are present and can advise on pre‑boarding. Spirit does not advertise a dedicated pet pre‑board, but most gate agents will let you board early to settle the carrier under the seat without blocking the aisle. Confirm your seat assignment is not in an exit row or a bulkhead seat, where under‑seat space is often smaller or non‑existent.

During the Flight: Rules and Etiquette

Slide the carrier fully under the seat in front of you, mesh panel facing outward for ventilation. Once the aircraft door closes, the carrier must remain shut. Do not open it during the flight—not even to soothe your pet with your fingers. Your own calm, quiet presence is the best comfort. If the pet whines or meows, place a lightweight jacket over the carrier to create a darker, den‑like atmosphere; this often reduces anxiety vocalizations without any further intervention. If the behavior continues or becomes disruptive, the flight attendant may instruct you to reposition the carrier; comply immediately. In a worst‑case scenario, continued loud noise or aggression can result in the crew having you and your pet removed at the next landing, without a refund. Keep absorbent pads on hand if an accident occurs, but wait until you are inside the terminal at your destination to change soiled bedding. Never use an airplane lavatory to clean the carrier.

Handling Layovers and Connecting Flights

If your itinerary includes a connection, your pet will need a bathroom break and a drink. Use a resource like BringFido’s airport pet relief maps to locate indoor pet rest areas in your connecting terminal before you travel. During the layover, take your pet out of the carrier only inside a designated relief room or outdoor pet area behind security—nowhere else. After the break, wipe down the carrier interior, replace the urine pad if needed, and reseal the carrier completely. Time your own airport activities so your pet is never left unattended.

Alternatives If Your Pet Doesn’t Qualify

Spirit’s no‑cargo, cabin‑only model means many animals simply cannot travel on this airline. If your pet exceeds the 40‑pound limit, is an unaccepted species, or your destination lies outside the United States, consider these routes:

  • Drive instead. For trips under a day’s drive, a car journey with a crash‑tested carrier or harness restraint is often less stressful for both of you.
  • Use a pet relocation professional. Companies belonging to the International Pet and Animal Transportation Association (IPATA) arrange ground transport or flights on airlines that carry pets in temperature‑controlled cargo compartments, including international moves.
  • Switch to a pet‑friendly airline. Major carriers such as Delta, American, and United offer live‑animal cargo programs and accept certain pets on international routes, subject to destination‑country import rules. Always compare policies before cancelling a Spirit ticket.
  • Hire a sitter or board your pet. For short trips, a trusted pet sitter or a reputable boarding kennel can be the simplest, safest option.

Service Dogs: The Only Exception

Under the Air Carrier Access Act, Spirit recognizes only trained service dogs that perform specific tasks for a qualified individual with a disability. Psychiatric service dogs that are individually trained to do work (not just provide comfort) are included. Miniature horses are not accepted. Emotional support animals are no longer accommodated under any category; they must travel as in‑cabin pets if they meet the species and size rules and the fee is paid. To travel with a service dog, complete Spirit’s required service animal documentation at least 48 hours before departure. The dog must fit within your foot space or on your lap without intruding into your neighbor’s area, and must be harnessed, leashed, or otherwise under your control at all times. A properly documented service dog flies free of charge.

Frequently Asked Questions

What types of pets can fly on Spirit Airlines?

Only small dogs, domestic cats, small household birds, and small domestic rabbits. All other species, including rodents and reptiles, are forbidden. Pets are permitted only on domestic flights and must stay in the cabin.

How much does Spirit charge for a pet?

The fee is charged per carrier, each way. The exact price can fluctuate, but as of 2025 it hovers around $125 each way. Always check the current amount on Spirit’s official pet policy page before booking.

Can I put two pets in the same carrier?

Yes, up to two pets of the same species can share a single carrier, as long as the total weight (carrier included) does not exceed 40 pounds and both animals can comfortably stand, turn around, and lie down.

Are there paperwork requirements for domestic flights?

For most domestic routes, no health certificate is required. However, if you are flying to Puerto Rico, you must present a valid rabies vaccination certificate. A letter from your veterinarian is optional but wise.

What happens if my pet causes a disturbance?

If the animal whines, barks, or acts aggressively before takeoff, boarding may be denied. In‑flight disturbances can lead the crew to demand the carrier stay under the seat; in severe cases, you and your pet may be removed from the aircraft without compensation.

Does Spirit transport pets in cargo or as checked baggage?

No. Spirit does not offer any live‑animal checked baggage or cargo service. All pets must travel in the cabin and fit the published size and weight limits.

What if my pet is too large or I am flying internationally?

If your pet exceeds the 40‑pound combined weight or your route goes outside the United States, Spirit cannot accept the animal. Consider driving, using a pet transport service, or booking a different airline that handles larger pets or international animal shipments.

Can I bring an emotional support animal on Spirit?

No. Spirit no longer recognizes emotional support animals as a separate category. Only trained service dogs, as defined by the U.S. Department of Transportation, are accepted free of charge with the required paperwork.

Final Checklist and Quick‑Reference Guide

Use this condensed list to confirm that you and your pet are ready for a Spirit Airlines flight:

  • Pet species is a small dog, cat, bird, or rabbit; no other species.
  • Your entire itinerary is domestic, with no Puerto Rico or U.S. Virgin Islands segments for birds or rabbits.
  • Pet is at least 8 weeks old, fully weaned, and appears healthy.
  • Combined weight of pet and carrier is 40 pounds (18.14 kg) or less.
  • Carrier is soft‑sided and measures no more than 18” x 14” x 9”, with secure zippers and ventilation on two sides.
  • Pet reservation has been added and paid for, and you have a receipt showing the pet fee was charged.
  • If traveling to Puerto Rico with a dog or cat, you hold the original rabies vaccination certificate (at least 30 days old if initial dose).
  • Carrier acclimate training has been completed, and you have absorbent pads, a spill‑resistant water dish, and a comfort item inside the carrier.
  • You arrive at the airport at least 2 hours before the flight and go directly to the full‑service counter.
  • You keep the carrier closed under the seat at all times and follow crew instructions.

When you meet each rule precisely, Spirit’s pet policy is predictable and can be a budget‑friendly way to keep your small companion with you. Miss any one requirement, however, and you risk being turned away at the gate. By preparing thoroughly, following the training steps, and having backups in place, you stack the deck heavily in favor of a safe, quiet journey for both of you.