United Airlines has its immediate solution for any passenger who misses a flight there. Contact the customer service department on: +1 (844) 884-3555 As per the policy of United Airlines Missed Flight, the airline provides a choice of either rebooking or placing the passengers on standby basis according to the sort of ticket and situation. Passengers are requested to contact well in time so that the alternatives may be discussed with them in minimal time. United Airlines is committed to making the transition smooth for travelers in case of disruptions and letting them continue to travel with as little hassle as possible.