Yes, Alaska Airlines lets passengers upgrade to First Class after booking, provided seats are available. You can do this online through Manage Reservations, at check-in, or at the airport kiosk. Upgrade prices depend on the route, fare type, and availability — sometimes starting as low as $29 for shorter flights. Mileage Plan members can also use miles to upgrade eligible fares. Booking early or holding elite status increases your chances of finding a First Class seat at a good rate.
