What Is the Standard Carry-On Size?

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.

Is There a Weight Limit for Carry-On Bags?

  • U.S. Major Airlines (Often No Weight Limit): Delta, Southwest, United, and Alaska Airlines generally don't have strict weight limits for domestic flights, focusing on fitting in the overhead bin.
  • Budget/International Airlines (Strict Limits): Airlines like Frontier (35 lbs), KLM (26 lbs), Lufthansa (17 lbs), and Hawaiian (25 lbs) have specific weight caps, often much lower. 

Final Tips Before You Fly

  • Always check your airline’s website before departure
  • Measure your bag including wheels
  • Avoid expandable features if flying full flights
  • When in doubt, stick to the industry standard size

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