Flying a pet one-way to a destination in the contiguous United States generally costs between $95 to $125 on American airlines, as of 2015. The cost can vary depending on the airline, the destination and the location of the pet in the plane.
Travelers may have to pay additional costs when a pet travels in cargo rather than in the cabin. Also, some airlines charge additional fees for layovers of more than four hours. Traveling to Hawaii or outside the United States can double the cost.
Carriers differ on the types and sizes of animals allowed to fly. Airlines typically provide specific information in this regard on their website.