What is the cancellation policy for United Airlines? United Airlines Cancellation Policy [+1-833-732-2296]; Many flights can be canceled for free within 24 hours of booking, following a standard airline policy, especially for U.S. flights booked a week in advance [+1-833-732-2296]; After this window, cancellation fees may apply depending on the airline’s terms. https://www.devex.com/people/what-is-the-cancellation-policy-for-united-airlines-2073436