What is the standard carry-on bag size allowed by airlines?
There is no single universal standard — each airline sets its own carry-on size limits. However, most full-service carriers allow bags around 22 x 14 x 9 inches (56 x 36 x 23 cm) including handles and wheels.
Budget airlines are often stricter:
• Ryanair: 40 x 20 x 25 cm (free underseat bag); larger bag requires Priority Boarding
• easyJet: 45 x 36 x 20 cm (underseat only for free); 56 x 45 x 25 cm with allocated seat
• Spirit Airlines: 18 x 14 x 8 inches (free personal item); larger bags charged
• Wizz Air: 40 x 30 x 20 cm free; 55 x 40 x 23 cm with Wizz Priority
Always check the specific airline's page on this site for their exact current carry-on allowance before packing.