Spirit Airlines is based at Oakland International Airport (OAK), Terminal 1. This Spirit Airlines OAK Terminal is renowned for its state-of-the-art amenities and practical design. Travelers on a tight budget can find flights to a number of domestic and international locations on Spirit Airlines. Travelers on Spirit flights have the option of checking in at specific terminal kiosks or online. Furthermore, Terminal 1 offers stores, restaurants, and cozy seating areas to improve the journey. It is recommended that travelers arrive early to ensure a seamless security and check-in procedure.