To change a flight booking with Alaska Airlines, you can easily manage your reservation online, through their mobile app, or by contacting customer service at 1-818-878-8939. Start by visiting Alaska Airlines' website and logging into your account. Navigate to “Manage Trip” and enter your confirmation code and last name to find your booking. Here, you can select “Change Flight” and follow the prompts to alter your travel dates, times, or destinations. Alternatively, use the Alaska Airlines app for similar steps. If you need assistance or prefer to handle changes over the phone, call Alaska Airlines’ customer service. Fees may apply depending on your ticket type and timing of the change.