Flying With an Emotional Support Animal From Colorado
Airline rules changed in 2021, and many travelers still expect an ESA letter to work at the gate. Here is what airlines can require, what a service dog needs, and how to get through Denver International Airport with less stress.
Two Very Different Paths Through the Airport
Under the U.S. Department of Transportation's Air Carrier Access Act rule, what counts is whether your animal is a trained service dog.
Emotional support animal
Trained service dog, including PSDs
Trip Paperwork Checker
Answer three questions for a general list of what to prepare. Your airline's own policy has the final word.
Your list
- Read the airline's pet policy, since an ESA usually travels as a pet.
- Reserve a pet spot early; cabin pet spaces are limited.
- Buy a carrier that fits under the seat in front of you.
- Budget for the airline's pet fee.
Pet Relief Areas at Denver International
DEN lists these spots for service animals and pets. Locations can change, so check the airport's website before you fly.
Tip: allow extra time. Going back out through security for the outdoor area adds a second screening.
Getting Through TSA With Your Animal
Screening is handled by TSA, not the airline. The general flow for an animal traveling with you looks like this.
Tell the officer you are traveling with a service dog or pet.
Pets come out of the carrier; the empty carrier goes through the X-ray.
Keep the leash on and walk through with your animal.
Expect possible extra screening of you and the animal.
When Your ESA Flies as a Pet
Pet policies vary a lot between airlines. These are the questions to ask before you book.
Cabin or cargo?
Many airlines allow only small pets in the cabin, and some no longer ship pets as cargo.
Carrier limits
The carrier usually has to fit under the seat and count as your personal item.
Species
Cabin pet programs are often limited to dogs and cats.
Destination rules
Hawaii and other countries can have their own entry and health requirements.
Travel Day, From Booking to Boarding
Booking
Tell the airline about the animal and get the forms.
48 hours out
Submit service dog forms if the airline asks.
Morning of
Light meal, a walk and a last relief break.
Check-in
Arrive early; animal travelers may need the counter.
Boarding
Settle the dog in your foot space before others board.
When an Airline Can Say No to a Service Dog
The DOT rule lets airlines refuse a specific dog in a few situations.
Behavior
Growling, biting or jumping on people signals a threat.
Space
The dog cannot fit in foot space or on a lap.
Missing forms
Required DOT forms were not provided.
Number
Airlines may limit a passenger to two service animals.
A Problem at the Airport
Ask for the airline's Complaints Resolution Official, who is required to be available for disability issues. You can also file a disability complaint with the U.S. Department of Transportation afterward.
Where an ESA Letter Still Counts
Flying rules and housing rules are separate. In Colorado, state law protects emotional support animals as assistance animals in housing from August 12, 2026. A letter from a licensed provider supports that housing request.
Documentation for Home, Not the Gate
Planning a move as well as a trip? Start with the Free Screening. Current plans and prices are below.
Colorado Travelers Ask About Flying With Animals
Can I fly with an emotional support animal from Denver in 2026?
Yes, but usually as a pet. Since the U.S. Department of Transportation's 2021 rule, airlines do not have to accept emotional support animals as service animals, so pet policies, carrier sizes and fees generally apply.
Does an ESA letter let my animal fly free in the cabin?
Not on most U.S. airlines. An ESA letter no longer requires an airline to treat the animal as a service animal. The letter remains useful for housing, where Colorado law protects assistance animals.
What forms does an airline ask for with a service dog?
Airlines may require the DOT Service Animal Air Transportation Form, and a relief attestation form for flights of eight hours or longer. If you booked more than 48 hours ahead, the airline can ask for the forms up to 48 hours before departure.
Is a psychiatric service dog allowed in the cabin?
Yes. The DOT rule treats a psychiatric service dog like any other service dog. It must be a dog individually trained to do work or tasks for a person with a disability, and the same forms may be requested.
Where can my dog relieve itself at Denver International Airport?
DEN lists pet relief rooms past security in the center cores of Concourses A, B and C, plus an outdoor area before security outside door 200 on the west side of Jeppesen Terminal. Check the airport's website before you fly in case locations change.
Can an airline refuse my service dog because of its breed?
The DOT rule does not allow airlines to ban service dogs by breed. An airline can refuse a specific dog that shows aggressive or disruptive behavior or that cannot fit in the handler's foot space or lap.
Before Your Next Colorado Trip, Read These
General travel information, current as of September 2026. Airline policies and DEN facilities change, and this is not legal advice. National Service Pets is not affiliated with any airline, Denver International Airport, TSA or the U.S. Department of Transportation.
Home Is Where the ESA Letter Matters Most
See whether an evaluation with a licensed provider fits your Colorado housing situation.
