Southwest Airlines flies mostly domestic routes out of Washington Dulles International Airport's (IAD) Terminal B. Southwest Airlines IAD Terminal **** Modern conveniences including free Wi-Fi, restaurants, and shops are available at Terminal B. The Dulles Aerotrain and pedestrian walkways provide easy access for passengers to the terminal. At IAD, Southwest offers self-service kiosks, online check-in, and conventional counters as check-in methods. Arriving at least 90 minutes before to departure is advised for a seamless travel experience. Flying from IAD is hassle-free thanks to Southwest's customer-focused offerings, such as free checked baggage, and Terminal B's effective design, which guarantees speedy access to gates.