Checking the Delta Airline Luggage Size rules before packing can help you reduce the risk of additional baggage expenses. Make sure your carry-on suitcase meets the standard dimensions of 22 x 14 x 9 inches, including handles and wheels. Keep smaller essentials in a personal item that fits beneath the seat. If you plan to check a suitcase, review the applicable weight, size, and fee requirements for your route. Charges can vary according to your ticket and travel benefits, so confirming the details in advance can help you plan your travel budget more effectively.