As of 2015, United Airlines charges $25 for the first checked bag, $35 for the second checked bag, and $100 for each additional bag, as detailed by Airfarewatchdog. Carry-on bags are free, and oversized bags are $100.
United.com, the official site of United Airlines, does not offer a baggage fee chart, but it offers a calculator based on specific or prospective flights. To check on baggage fees for a specific flight, the user enters either a Mileage Plus number and a pin or a confirmation number and last name. To search baggage charges for any flight, the user enters the origin and destination airport as well as the departure date, cabin type and any memberships.