If you’re wondering, What Terminal is Alaska Airlines at LAS, the airline operates from Terminal 3 at Harry Reid International Airport. Passengers flying with Alaska Airlines can check in at Terminal 3 using self-service kiosks, ticket counters, or mobile boarding passes. The terminal offers modern amenities, dining options, retail shops, and efficient security screening. Clear signage and accessible ground transportation make navigating LAS simple, ensuring a smooth departure and arrival experience for all Alaska Airlines travelers.