What Terminal is Aer Lingus at SFO Aer Lingus operates out of the International Terminal of San Francisco International Airport (SFO). It utilizes Boarding Area G, which is designated for use by international airlines. The International Terminal at SFO is well-equipped with stores, restaurants, and lounges to ensure that travelers have a pleasant journey. Travelers on Aer Lingus flights should plan to arrive at the International Terminal well in advance, particularly for international travel, to provide time for pre-flight procedures including as security screening and check-in.