For most Delta flights, the recommended Sherpa carrier size is Medium. The Sherpa Medium typically measures about 17″ L x 11″ W x 10.5″ H, which aligns closely with Delta’s common under-seat allowance of approximately 18″ L x 11″ W x 11″ H. This size is designed to be flexible and slightly compressible to slide under the seat while keeping your pet safe and comfortable.
If your pet is very small, the Sherpa Small (about 15″ L x 10″ W x 8.5″ H) can also work and offers a cozier fit. For larger pets, the Sherpa Large (about 19″ L x 11.75″ W x 11.5″ H) may be too tall or long for many Delta aircraft, so it’s best used only when the specific plane’s under-seat space allows. Always confirm the aircraft type and under-seat dimensions for your exact route, as these can vary.
How to size your dog for a comfortable flight:
For more tips on choosing a stylish, durable, and pet-safe travel bag, see our guide: How to Choose a Dog Carrier Bag.
Delta generally allows a soft-sided carrier that fits under the seat, often around 18″ L x 11″ W x 11″ H. The Sherpa Medium (about 17″ x 11″ x 10.5″) is a common fit. Always check your specific aircraft’s under-seat dimensions before you fly.
The Sherpa Medium is the go-to for most Delta flights, as its soft sides can flex to fit under-seat spaces near 18″ x 11″ x 11″. Very small pets may use a Small, but Large often exceeds typical under-seat space.
Yes. Delta measures carry-on size by the item’s total dimensions, including wheels and handles. For pet carriers specifically, the carrier must fit fully under the seat in front of you.
