Originally Posted by CoC

Schedule Change- When a Passenger’s Ticketed flight is affected because of a Schedule Change that modifies the original departure and/or arrival time by 30 minutes or more, UA will, at its election, arrange one of the following:
Provided that the dates of departure and arrival must be within 7 days of the originally scheduled dates of departure and arrival, respectively, transport the Passenger on its own flights, subject to availability, to the Destination, next Stopover point, or transfer point shown on its portion of the Ticket, without Stopover in the same class of service, at no additional cost to the Passenger;
When a Schedule Change results in the cancellation of all UA service between two cities, at UA’s sole discretion, UA may reroute Passengers over the lines of one or more carriers in an equivalent class of service;
Advise the Passenger that the value of his or her Ticket may be applied toward future travel on United within one year from the date of issue without a change or reissue fee; or
If the Passenger is not transported as provided in C) 1) or 2) above and does not choose to apply the value of his or her Ticket toward future travel as provided in C) 3) above, the Passenger will be eligible for a refund upon request. See Rule 27 A).