- KLM Airlines provides a seamless and effective travel experience for travelers out of Terminal 1 at Singapore Changi Airport (SIN). World-class amenities including opulent lounges, duty-free shops, and a variety of eating options are what make this KLM Airlines SIN Terminal famous. KLM offers convenient and comfortable services for both business and leisure visitors. Along with offering a smooth link to a number of foreign locations, the airline lives up to its reputation for excellence and customer service. Travelers should anticipate a smooth trip beginning at Terminal 1.