Generally, Los Angeles International (LAX) and San Francisco International (SFO) are the cheapest airports to fly into in California due to the sheer volume of international and domestic competition. In 2026, these "mega-hubs" benefit from being the primary ports for low-cost carriers and major international airlines, leading to more frequent fare wars. However, if your destination is Southern California, you should also check Ontario International (ONT) or Burbank (BUR); while the base fare might be slightly higher, the savings on parking, car rentals, and the lack of traffic can make the "total trip cost" lower. For the San Francisco Bay Area, Oakland (OAK) and San Jose (SJC) often offer cheaper flights on domestic routes via Southwest Airlines. Data shows that flying into SFO is currently the most budget-friendly option for travelers coming from Asia or Europe, while LAX remains the price leader for those arriving from South America or across the United States.