We care for your pets here at Delta! We have a pet policy that is unmatched because of this. Airline's Pet Policy Basics are as follows: Pets are welcome on all Delta flights, even those that go abroad. (So long as doing so is permitted by local law in the destination nation.) Providing they are small enough to comfortably fit in a carrier or container that fits under the seat in front of you, pets fly free in the cabin with you. Delta Pet Policy All animals must be able to sit upright inside an approved carrier while traveling. Find out more about taking a small pet on vacation here.