In 2026, the only way to fly with a dog for "free" is by having it qualified as a task-trained Service Animal under the Americans with Disabilities Act (ADA) or similar international regulations. Since 2021, most airlines have eliminated the "Emotional Support Animal" (ESA) category, meaning only dogs trained to perform specific tasks for a person with a disability (like guiding the blind or alerting to seizures) fly at no extra cost in the cabin. To do this, you must submit a DOT Service Animal Air Transportation Form at least 48 hours before your flight, detailing the dog's training and health. For non-service pets, there is no legitimate way to fly for free; fees typically range from $95 to $200 each way. Attempting to misrepresent a pet as a service animal is illegal in many jurisdictions and can result in heavy fines or being barred from the airline.