Singapore Airlines is based out of Frankfurt Airport's Terminal 1 (FRA). This terminal is where Singapore Airlines FRA Terminal. passengers check in, go through security and board their aircraft. One of the primary terminals at FRA Terminal 1 provides a variety of amenities including stores, restaurants and lounges. Signs and information screens are available to help tourists to their gates. To ensure you have adequate time for security checks and check-in prior to your trip, arrive early.