Singapore Airlines Service out of Ontario International Airport (ONT) in California Singapore Airlines ONT Terminal offers a variety of great services for its passengers. Although ONT is not one of Singapore Airlines main hubs, the terminal has one of the smoothest check-in processes possible, with comfortable seating and easy access to lounges for eligible passengers. Ont provides an easy, hassle-free alternative for passengers who prefer not to go through their busy regional airports during preflight. Passengers will be able to dine and shop within the terminal before boarding Singapore Airlines, which is renowned for its wonderful service-a great departure point for international travel.