Which terminal does United fly out of Ontario?

Terminal 2

ONT Courtesy Shuttle Ontario International Airport provides free courtesy shuttle that transports visitors between the passenger terminals, parking lot 5 and the Consolidated Rental Car Facility (ConRAC). All shuttles are wheelchair accessible. ONT Courtesy Shuttle Hours of OperationShuttle Route Service DaysService HoursConRac7 Days a Week24 hoursParking Lot 5Monday - Saturday3am to 1am (22 hours/day)Sunday3am to 12am (21 hours/day) Shuttle Frequency The courtesy shuttles run every 5-20 minutes, with shuttles departing less frequently between 12am (midnight) and 3am due to reduced flight activity. Please account for additional travel time when using the airport courtesy shuttles