Yes, you can always change your flight date as mandated by Alaska Airlines flight change policy which depends on the passenger’s fare type, and can be done by paying a fee. The airline charges $125 per person, per change, along with any applicable fare difference. Alaska Airlines same day confirmed flight change can be done after paying $50 fee, subject to availability of seats. This can be done during the check-in, and when the new flight is departing on the same calendar day as the original departure.