What Terminal is Aer Lingus at SFOAer Lingus operates out of Terminal 1 at San Francisco International Airport (SFO). This terminal is known for its modern amenities and streamlined services, catering to both domestic and international travelers. Terminal 1 offers a variety of dining options, retail stores, and comfortable lounges, ensuring a pleasant experience while waiting for flights. Travelers flying with Aer Lingus can expect efficient check-in processes, clear signage, and easy access to security checkpoints, making their journey through SFO smooth and convenient.