What Size Is Carry-On Luggage? A 2026 Airline Size Guide

While there is no single federal rule governing carry-on luggage size, most airlines follow well-established standards. Here’s how carry-on size rules typically break down in 2026:

• Most major U.S. airlines (such as Delta, United, and American) allow carry-on luggage up to 22 × 14 × 9 inches, including wheels and handles. This size fits most standard rolling suitcases and duffel bags and is designed to fit in overhead bins on domestic flights.
  
• Budget airlines (including Spirit and Frontier) often apply stricter rules for free bags. Their free allowance is usually limited to personal items around 18 × 14 × 8 inches, which must fit under the seat. Larger carry-on bags are permitted only with an additional fee and are more strictly enforced at the gate.
  
• International airlines may use different measurement systems or enforce slightly smaller carry-on size limits, especially on short-haul or regional aircraft. Always check your airline’s official guidelines before flying internationally.