Fairfield Transit (FAST) provides general public fixed route bus service through eight local routes.

All FAST buses are wheelchair accessible and most are equipped with bike racks.

[3] In 2023, the system had a ridership of 233,800, or about 700 per weekday as of the third quarter of 2024.

FAST runs eight bus lines within the city of Fairfield (including Cordelia) with transfer hubs at the Fairfield Transportation Center (FTC), the Fairfield–Vacaville Amtrak station, a Walmart store, and Solano Town Center.