Oreo in a Sherpa Original Deluxe pet carrier in the Denver International Airport.

Moving and Flying to Spain with a Cat

Being a minimalist made moving to another country less intimidating than it otherwise could have been. So did retaining my house in Colorado as a vacation home, as it meant there was markedly less stuff I had to sell or otherwise dispose of. I knew from a two-month “practice run” last year that all I really needed to bring was a laptop bag and carry-on suitcase. Such is the life of someone who is effectively a digital nomad.

But one thing that I was apprehensive about was taking my cat. Oreo, you see, is a bona fide homebody. He even protests and panics for his life during once-a-year, eight-minute drives to the vet for an annual checkup. How in the world was he going to handle a day-long journey to another country necesitating multiple flights?

Fortunately, even though I had zero experience doing this prior, plenty of other people did. This included the woman who was cutting my hair and whose dream job was to be a caretaker on the “Cats Islands” of Greece. Her partner, she told me, rescues cats and flies with them all the time. Talking with her made flying with only one cat seem easier than making a dessert from cake mix. If only!


There still was the whole process of executing the move. It can be summarized as follows:

  1. Book a flight for you and your cat. But read the following steps first because the timing of everything is critical! Also, if you want to travel with your cat inside the cabin instead of the cargo hold, note that there are only a couple of airlines you can do so from the U.S. to Spain: Delta and United. There may be more, but I know for sure that British Airways and American only allow pets to go in the cargo hold. Also note that you will most likely have to book the flight on the telephone with an agent when you are flying with a pet. (I had to do so with both United and Iberia, or 1.5 hours on the phone.) Pet surcharges range from 35 (Iberia) to $150 (United).
  2. Make an appointment with an United States Department of Agriculture (USDA) Accredited Veterinarian to use USDA’s online Veterinary Export Health Certification System (VEHCS) to complete health certificates. Because the health certificate must be endorsed by the USDA’s Animal and Plant Health Inspection Service (APHIS) no more than 10 days before the cat’s arrival in Spain, this appointment should be say, 11 or 12 days before.
  3. Before the appointment—ideally, at least several weeks prior—make sure your cat is microchipped and vaccinated for rabies. Also, if your cat will be flying in the cabin and you don’t already have a cat carrier (see section farther down) that can fit beneath an airplane seat, buy one. Also consider buying a cat calming spray and cat calming chews to help reduce anxiety for your cat during travel.
  4. At the appointment in step (1), bring the vaccination certificate from step (2) along with your cat. The vet will need to do a quick check up and also check that the microchip is working and is one of the two standard microchip readers that Spanish customs will have. The checkup + health certificate cost me about $230, including overnight shipping in the next step.
  5. The vet will then submit the health certificate to the USDA online, along with payment for Express or Priority Mail Shipping.
  6. APHIS will then endorse the certificate, review, print out, and ship the health certificate back to the vet. Because shipping is involved, it could take a few days. It took five days for Oreo’s, including the weekend.
  7. Fly with your cat, bringing the health certificate and rabies certificates. At the first airport you arrive at in Spain, present the certificates and the cat to Spanish Custom’s declaration office. They will quickly review the certificates, check the cat’s microchip, and let you on your way. Note that the airports in the U.S. or the airlines will not ask you for these certificates before boarding and it’s completely your responsibility to make sure you have all the documentation before flying.

More about this online certification process, and its requirements, is at the USDA’s official site for pet health certificates for Spain.

My timeline was like this:

  • January 26 (Wednesday): Appointment with vet—which was not Oreo’s normal vet since he didn’t do health certificates, but was recommended by his office.
  • January 31 (Monday): Vet received the APHIS-endorsed health certificate from the USDA and I went to pick it up.
  • February 4 (Friday): Flew to Spain with Oreo on United (two flights, with a connection in Newark) and Iberia (one flight, from Madrid to Santiago de Compostela).

Cat Carrier

Since Oreo would be flying with me in the cabin, the cat carrier had to fit underneath the seat of the airplanes we would be going on. A soft carrier made the most sense since the space beneath the seats on airlines are all different. Being made from fabric, the carrier can be scrunched down a little to fit beneath the seat.

Due to Amazon reviews and reputation, I purchased a Sherpa Original Deluxe pet carrier. The Amazon listing said that it was “approved for use on most airlines and included in Sherpa’s Guaranteed On Board program.”

It turned out that the Guaranteed On Board program is only guaranteed for domestic flights.

More concerning was that Delta said this for international flights:

The soft- or hard-sided kennels must be leak-proof and have ventilation openings on three sides (four sides for international travel).


Unfortunately, I only saw the above after receiving the cat carrier—and the Sherpa Original Deluxe only has ventilation openings on three sides. So I wrote Worldwise, the Sherpa’s parent company, about this, asking if I would be forbidden from using it on Delta. They replied,

The mesh on 4 sides requirement is a newer addition to Delta’s international pet carrier policy. I would contact Delta directly to clarify the specifics of their policy, but I would think that if you’re able to open the top zipper without your pet escaping, that it could count as an additional side of ventilation.

We do make one carrier that has mesh panels on 4 sides – the On Wheels. It is for pets up to 22 lbs. and is 20” long x 12.25” wide x 10.5” high. Please find a link below. I hope this helps! Please let me know if I can provide any additional information. Thank you!

[email protected]

They also added,

I believe only Delta has the 4 mesh panel requirement so you should be fine with United. They’re one of the more accommodating airlines to in-cabin pets. 

[email protected]

Ultimately, I flew on United so I did not have to worry about the four-side ventilation requirement. I did bring a lot of safety pins, however, in case the zippers failed (they didn’t)!

Things for the Flight

For Oreo, I packed the following:

  • The aforementioned cat calming spray and cat calming chews.
  • Pee pads that friend Tori thoughtfully gave to me a few days prior.
  • Plastic bags and latex gloves to handle the pee pads.
  • Temptations cat treats.
  • A receptacle for water.
  • A collapsable box I constructed out of posterboard. This was to be a kitty litter box in the airports. (You can use a collapsable gift box instead if you have one.)
  • Zip-lock bags of kitty litter.

The Flights

February 4th was move day. I gave the cat carrier about six whiffs of the calming spray before putting Oreo in there. My friend Matt picked Oreo and me up and drove us to the Denver International Airport.

Here is Oreo patiently waiting for the first flight:

Oreo in a Sherpa Original Deluxe pet carrier in the Denver International Airport.

The first flight to Newark, New Jersey was about 3.5 hours long. Because I spent the whole night before doing last-minute cleaning of my Colorado home, I was plenty tired and slept all but a few minutes of the flight.

During those few minutes I thought I smelt some urine. Oreo also was being very talkative—fortunately there was no one sitting next to us. I thought to myself, “Oh no, I’m going to have to change those pee pads at the airport,” and went back to sleep.

As it turned out, Oreo did not take a pee! However, there was a crying baby in the row in front of me. I think the baby might have been the reason Oreo was meowing a lot (fortunately, Oreo was quieter than the baby!), and also might have been the leaky one.

Inside the Newark International Airport, I found a pet relief station that even had bins of kitty litter. However, Oreo refused to use it despite giving him two opportunities to.

The pet relief station inside the Newark International Airport in New Jersey.
The pet relief station inside the Newark International Airport in New Jersey.

Actually, after the first flight Oreo was very mellow. Here he is on a counter at the Newark airport, waiting while I ate a dinner comprised of a $60 filet mignon that was ordered and paid for by a random traveler. It hadn’t arrived by time he had to board his flight, so he generously offered it to me.

Oreo in a Sherpa Original Deluxe pet carrier in the Newark International Airport.
Oreo in a Sherpa Original Deluxe pet carrier in the Newark International Airport.

On the 7.5-hour flight to Spain, Oreo was exceptionally calm. I guess he was accustomed to this by now. Once again, I slept throughout the entire flight.

Oreo in a Sherpa Original Deluxe pet carrier under a seat on an international United flight from Newark, New Jersey to Madrid.
Oreo in a Sherpa Original Deluxe pet carrier under a seat on an international United flight from Newark, New Jersey to Madrid.

When we got to Madrid, I quickly got through customs. There was no one else who had anything to declare so I did not have to wait in line. The customs agent looked at the health certificate, recorded some things in a book, successfully scanned Oreo for the microchip, and we were on our way.

Unfortunately, despite rushing… we couldn’t make it to our third and last flight in time. This is because the second flight was delayed, mostly because of a wing de-icing procedure. Fortunately, Iberia had another flight to Santiago de Compostela just three hours later and they had room for us. (I think, but am not sure, that Iberia only allows one pet on each flight–which is why they need to pre-authorize the pet. So we were lucky no one else was traveling with a pet.)

At the Madrid airport, I couldn’t find a pet relief station, so I went to a small family bathroom–basically a small private bathroom with a lockable door–instead and set up the kitty litter box for Oreo. However, he refused to use it and also wouldn’t eat or drink. I was amazed by the fortitude of his bladder!

It was a relief to get on the third and last flight, as that one was only a little over an hour long and by that point I knew there was nothing going to stop us now. Oreo was very popular with the ladies sitting around us on this flight. In fact, after we landed in Santiago where my girlfriend Andrea picked us up, we stepped into an elevator that those ladies were and they cheerfully exclaimed, “¡Oréo!”

Once we arrived home in Spain, the first thing we did was put some food and water out for Oreo. He took to the food immediately, having not eaten for nearly 24 hours.

Oreo eating Spanish cat food in his new home in Galicia.

Unfortunately, the first evening he refused to use the kitty litter box that Andrea had gotten for him, mainly because it had litter of the silica type that he was not used to. The next day we were concerned enough that we found a 24-hour market that was open on Sundays that sold some “regular” (clay) kitty litter. We loaded it up in the box and Oreo used it immediately. What a relief it must have been for him! It was only later that I read that cats can “hold it in” for 24-48 hours if necessary, and Oreo is proof of that.

In conclusion, flying with a cat was not so bad. But I’m sure that Oreo is glad that he will probably never have to do that ever again.