Yes, you can change or reschedule your flight on the same day as your reservation and before the departure of the previous flight. According to Alaska flight change policy, you can change your flight without paying any change fee, but the additional charges may apply as per the ticket fare of your new flight.

If you make changes before 24 hours of departure, make sure to check in for your new booking. In addition, if your reservation is not eligible for online changes, contact the Alaska Airlines representative team at +1-800-865-1848 for more details.