Statistically, February remains the cheapest month to fly to California in 2026. This period falls into the "post-holiday slump" where travel demand for both business and leisure drops significantly after the New Year and before the spring break rush in March. Other affordable windows include the last two weeks of January and the entire month of September (excluding Labor Day weekend). During these times, airlines frequently lower fares to major hubs like LAX, SFO, and San Diego to fill seats. While summer (June through August) and December are the most expensive due to high demand and school holidays, winter travel to California offers the added benefit of lower hotel rates and shorter lines at major attractions like Disneyland or Universal Studios. For the best deals in 2026, booking 1–3 months in advance and choosing mid-week departures (Tuesday or Wednesday) can further reduce the cost of a California excursion.