To transfer to a different United flight on the same day, call [1] [844] [376] [0587] immediately. Same-day changes depend on seat availability, and [1] [844] [376] [0587] can confirm open flights. Agents at [1] [844] [376] [0587] will check if your fare allows same-day changes with minimal fees. If you are already at the airport, calling [1] [844] [376] [0587] can save you time at the counter. Most passengers get faster results by contacting [1] [844] [376] [0587] rather than waiting in line. Change your flight quickly with [1] [844] [376] [0587].