Pet Carrier for Cats: How to Choose the Right One for Vet Visits, Car Trips and Flights

A pet carrier for cats is a ventilated, secure enclosure used to move a cat safely to the veterinarian, in a car, or on a plane. The best one is sturdy, easy to clean, big enough for your cat to stand, turn around and lie down, and opens from both the front and the top so a vet can examine your cat without pulling it out. For cabin flights, Delta Air Lines and American Airlines both accept soft-sided carriers up to 18 x 11 x 11 inches as of September 2026.

This guide pulls together what veterinary organizations, the International Air Transport Association (IATA), airlines and published research say about choosing and using a cat carrier. It is written by the Animal Passport editorial team and was last updated in September 2026. Airline rules change every year, so check your airline before you fly.

What makes a good pet carrier for cats?

Veterinary groups agree on a short list of must-have features. In a February 2026 client resource, the American Animal Hospital Association (AAHA) said a good carrier should let a cat stand, turn around, sit and lie down comfortably, be well ventilated, be easy to clean, have a front door the cat can walk through on its own, and have a removable top or top opening so the vet can reach the cat easily.

The Feline Veterinary Medical Association (Feline VMA), formerly the American Association of Feline Practitioners, adds more detail in its 2026 caregiver brochure Purrfect Journey: A Cat Carrier Guide for Caregivers. It recommends a carrier that is:

• Sturdy and escape-proof, with a secure door.
• Leakproof and water-resistant, so accidents during travel stay inside and wipe off.
• Top-removable, so your cat can stay in the bottom half during a checkup.
• Floor-level at the entrance, so your cat can walk in on its own and feel more in control.
• Lined with non-slip bedding that smells like home.

Both organizations also say to use one carrier per cat. AAHA says that in a home with more than one cat, each cat should have its own carrier, and the Feline VMA says to use one carrier per cat when traveling together.

Carriers veterinary guidance says to avoid

The Feline VMA's 2026 brochure specifically warns against three designs for vet trips: soft carriers that do not hold their shape, collapse easily or are hard to clean; backpack carriers that let the cat move around too much and see too much; and carriers without removable tops. Those tips are meant for car trips to the clinic. They are not an airline rule.

Hard-sided vs soft-sided cat carriers: where the sources disagree

The main disagreement is about material. Veterinary guidance leans toward rigid carriers with removable tops for clinic visits. Airlines lean toward soft-sided carriers for the cabin, because those fit more easily under the seat. Delta Air Lines recommends a soft-sided kennel for in-cabin pets, and American Airlines lists soft-sided collapsible kennels as recommended, as long as you do not have to squash the kennel much to fit it under the seat.

In practice, many cat owners end up with two carriers: a rigid, top-opening one for the vet and the car, and an airline-sized soft carrier for flights. If you only want one, a soft carrier with a stiff frame, a top zip opening and mesh on several sides meets most of both sets of advice.

What size carrier does my cat need?

For a car or clinic carrier, the AAHA rule is the easiest: your cat should be able to stand, sit, turn around and lie down comfortably inside. Delta phrases its cabin rule the same way: the pet must be able to move around without touching or sticking out of the sides.

For a more exact size, IATA publishes a formula on its Traveler's Pet Corner page, based on its 2026 Container Requirement 1 (CR1) for cats and dogs. Take four measurements of your cat while it stands naturally:

1. A: length from the tip of the nose to the base of the tail.
2. B: height from the ground to the elbow joint.
3. C: width across the shoulders or the widest point, whichever is larger.
4. D: height from the floor to the top of the head or the ear tips, whichever is higher.

IATA's minimum internal dimensions are then: length = A + half of B, width = C x 2, and height = D + the height of the bedding. IATA says snub-nosed breeds need a container 10% larger. Snub-nosed cats include Persians and Exotic Shorthairs. These are internal measurements, so compare them with the inside of the carrier, not the outside dimensions on the label.

Airline rules for an in-cabin cat carrier (as of September 2026)

If your cat is flying in the cabin, the carrier has to fit under the seat in front of you. That space depends on the aircraft, so the published numbers are limits, not guarantees.

Delta Air Lines

As of September 2026, Delta recommends a soft-sided kennel no larger than 18 x 11 x 11 inches because it fits most aircraft types. The kennel must be leak-proof and have ventilation on 3 sides for domestic flights and 4 sides for international flights. Delta's in-cabin pet fee is $150 each way within the US and Canada for tickets issued on or after April 8, 2025, and $200 for international flights. Cats must be at least 8 weeks old to fly domestically, and at least 16 weeks old when flying into the US from another country. Delta does not allow in-cabin pets to or from destinations including the United Kingdom, Australia, New Zealand and Hawaii.

American Airlines

As of September 2026, American Airlines accepts soft-sided carriers up to 18 x 11 x 11 inches (46 x 28 x 28 cm) on all flights. Hard-sided carriers can be up to 19 x 13 x 9 inches on American mainline flights but only 16 x 12 x 8 inches on regional American Eagle flights. Soft kennels must be padded, water-repellent and have nylon mesh ventilation on 3 or more sides. American charges $150 per kennel for a carry-on pet. It does not allow in-cabin pets on its Boeing 777 and 787 aircraft or the Airbus A321XLR, because those planes lack under-seat storage.

What this means when you buy

• A soft-sided carrier no larger than 18 x 11 x 11 inches is the safest choice across both airlines.
• A hard-sided carrier that fits American mainline flights may not fit an American Eagle regional jet.
• Delta says it will check your carrier at the Special Service Counter. At security you will have to take your cat out of the carrier, so a harness helps.

How to use a cat carrier safely in the car

No government crash-safety standard applies to pet carriers. When the Center for Pet Safety (CPS) and Subaru of America published their crate and carrier crash tests in 2015, they said there were no test protocols or performance standards in the US to back up manufacturers' claims that products were crash tested, and some tested products failed completely. They advised strapping crates and carriers down with strength-rated anchor straps, not elastic or bungee cords.

The Feline VMA's 2026 advice is simple. Secure the carrier on the vehicle floor behind the driver's or passenger's seat. Only use a seat belt if the carrier is crash-test certified, because a belt can crush a carrier that is not built for it. AAHA (2026) adds three more tips: hold the carrier close to your body, do not swing it by the handle, and drive smoothly.

How to get your cat to like its carrier

Carrier training is the step most owners skip, and it matters. In AAHA's 2026 article, feline practitioner Ilona Rodan, DVM, DABVP (Feline Practice), says, "The number one thing is carrier training." She also notes that she trained her first cat when he was 12 years old.

There is evidence behind the advice. In a 2018 blinded randomized controlled trial published in Applied Animal Behaviour Science, Lydia Pratsch and colleagues split 22 cats into a training group of 11 and a control group of 11. The trained cats got 28 positive-reinforcement carrier sessions over six weeks. During a 10-minute car ride, they had significantly lower Cat Stress Scores than the control cats, and their veterinary exams were significantly shorter.

A simple routine, adapted from the Feline VMA's 2026 training steps and AAHA's guidance:

1. Leave the carrier out all the time, in a room your cat already likes, with the top off and a blanket inside.
2. Reward any interest: toss treats near the carrier, then at the door, then inside. AAHA advises against feeding regular meals in the carrier if your cat is already anxious.
3. Put the top back on once your cat is happy lying on the blanket inside.
4. Close the door briefly, give a reward, and slowly build up the time.
5. Practice lifting the carrier from the bottom with both hands, never by the handle alone.
6. Take short car rides with the carrier covered by a towel. The Feline VMA suggests spraying the towel with a synthetic feline pheromone about 15 minutes before your cat goes in.

Never force a cat into a carrier. AAHA warns that forcing a cat in even once can undo weeks or months of training. If your cat still panics, ask your veterinarian before the appointment whether anti-anxiety medication is right for your cat. IATA discourages sedating pets for flights unless a veterinarian directs it for a valid medical reason and records it on the health certificate.

A carrier is not identification

A carrier keeps a cat contained, but it does not prove who the cat is or who owns it. IATA recommends a microchip plus two tags on the collar: a permanent ID with your home details and a temporary travel ID with where you can be reached during the trip. For international trips, the United States Department of Agriculture Animal and Plant Health Inspection Service (USDA APHIS) says cats count as pets for travel purposes, and it tells owners to contact a USDA-accredited veterinarian as soon as they decide to travel so they can meet the destination country's entry rules.

Pet travel documents, such as the EU pet passport and airline health certificates, are official schemes run by governments and vets. They are not the same as Animal Passport. Animal Passport is a digital animal and livestock passport that identifies animals by muzzle biometrics: the nose print, which is unique like a fingerprint. A phone captures the nose print, and the record links the owner, breed, estimated age, body condition and vaccination history. Animal Passport was used in livestock flood rescue in Pakistan in August 2025, so farmers could reclaim their animals after paper tags washed away. It is not a government-issued travel document and does not replace a microchip, a health certificate or an airline's pet rules. You can read more about animal identification on the Animal Passport blog.

Quick checklist before you buy a pet carrier for cats

• Your cat can stand, turn around and lie down inside (AAHA, 2026).
• It has both a front door and a top opening or removable top.
• It is ventilated on at least 3 sides, which Delta and American require for soft cabin carriers.
• It is leakproof, water-resistant and easy to wipe clean.
• For flights, its outside dimensions are within 18 x 11 x 11 inches, and you have checked your aircraft type.
• For regular car use, it is crash-test certified, or you will place it on the floor behind a front seat.
• You have a few weeks before the trip to carrier-train your cat.