International Airlines

You can confirm a seat on an alternate United flight on the same day of travel as your scheduled itinerary, within three hours of the time of your request. If eligible seats are available on an alternate flight, your change will be confirmed for a $75 fee.
You can request a same-day travel change during check-in at an EasyCheck-in® kiosk at the airport or when using EasyCheck-in Online®. You may also contact a customer service representative at the airport check-in counter or call 1-800-UNITED-1 (1-800-864-8331).
* No change fee will be required for confirmed same-day changes to business class or full-fare economy class tickets. The same-day change fee will apply to discounted economy class tickets.
* Same-day travel changes are available for flights within the 50 United States.
* Available only for identical routing: same destination and same connection city.
* Alternate flights must be scheduled to depart within three hours of your request. For flights outside of three hours the standard change fee policy will apply.
* The confirmed same-day change fee is nonrefundable and will be collected at the time when the change request is made.