Pet Policy Overview
Southwest Airlines is a popular US low-cost carrier that allows small cats in the cabin on all domestic US flights. The airline does not offer any cargo or checked baggage pet service — cabin is the only option. Southwest's major advantage is its extensive domestic US network with no change fees, making it flexible for pet owners who may need to adjust travel dates. The $125 each-way fee is competitive and consistent, with no premium for different routes.
Key Details
Pet Fee
$125 each way
Pro Tip
Southwest cannot prebook pets — you must notify the airline at check-in and availability is first-come, first-served with a limit of 6 pets per flight. Arrive early to secure your spot. Only one carrier per passenger. The carrier must be leak-proof and ventilated, fitting completely under the seat. Southwest only allows one pet per carrier. Unlike most US carriers, Southwest does not fly internationally (except limited Caribbean routes), so this is a domestic-only option.
Restrictions
Domestic US routes only (plus limited Caribbean/Mexico service). No cargo, no checked baggage — cabin only. Maximum 6 pets per flight on a first-come basis. One pet per carrier, one carrier per customer. Pets must remain in the carrier for the entire flight. Not available on flights to/from Hawaii. Cats must be at least 8 weeks old and fully weaned.