Can I cancel my United Airlines flight 1-855-838-5875 without penalty? Can I cancel my United Airlines flight 1-855-838-5875 without penalty?Can I cancel my United Airlines flight 1-855-838-5875 without penalty? https://strhub.com/forum/topic/can-i-cancel-my-united-airlines-flight-1-855-838-5875-without-penalty-2/#postid-149512