Alaska Airlines IAD Terminal. This is a handy location for our check-in counters and gate, providing a seamless beginning to your journey. See our welcoming team standing by to answer any inquiries you may have. While you wait for your trip, take advantage of the numerous amenities, culinary options, and cozy seating places. Use our mobile app to watch the status of your flight and check in for a hassle-free experience. Travel safely on Alaska Airlines!