Oakland International Airport has two terminals - Terminal 1 and Terminal 2. These terminals are connected with covered walkway accessed only after clearing through security screening—both terminals house stores, restaurants, bars, and newsstands both after the security checkpoint and before.

Terminal 1

Terminal 1 houses American Airlines, JetBlue, Spirit Airlines Alaska Airlines, Contour Airlines Allegiant Air, Azores Airlines, Delta Air Lines, Hawaiian Airlines, and Volaris. Most of the ticket counters are at the ground level of this terminal. Level 2 has access to gates 1-17 and gates 20-32 of Terminal 2. Travelers will also find passenger transit area and Lost and Found station in Terminal 1. In the post-security area, there are duty-free shops, bars, newsstands, and restaurants. Terminal 1 has 17 numbered gates in total. Only Gates 1 and 3 handle international flights.

Terminal 2

Terminal 2 is occupied entirely by Southwest Airlines. Security checkpoints are at the center along with access points to gates 20-25 and 26-32. There is also a separate baggage claim area and ticket desks. Terminal 2 has 13 gates in total, numbered from 20 to 32. Gate 20 connects with Terminal 1.

In 2017, Southwest announced that they would offer nonstop flights to four new destinations from

Oakland International Airport. These airports are: San Antonio, Texas (SAT), Orlando, Florida (MCO), Minneapolis / Saint Paul, Minnesota (MSP), and Indianapolis, Indiana (IND).