The "Farm to Fly Act of 2025" aims to integrate sustainable aviation fuel (SAF) into Department of Agriculture bioenergy programs, fostering alternative biofuels in national aviation. Its primary purposes include expanding the fuel supply, promoting clean energy sources, and supporting United States agriculture by recognizing the sector's critical role in SAF production. The bill significantly amends the Farm Security and Rural Investment Act of 2002 by adding a detailed definition for sustainable aviation fuel . This definition specifies that SAF must meet certain ASTM International standards, not be derived from petroleum or palm fatty acid distillates, and achieve at least a 50 percent lifecycle greenhouse gas emissions reduction compared to petroleum-based jet fuel. Furthermore, the legislation establishes a "Farm to Fly Collaboration Initiative," directing the Secretary of Agriculture to pursue all Department mission areas for SAF advancement. This initiative involves maximizing inter-agency effectiveness, identifying development opportunities, leveraging farmers' capabilities, supporting rural economic development, and fostering public-private partnerships. Finally, the bill amends the Biorefinery, Renewable Chemical, and Biobased Product Manufacturing Assistance section to explicitly include fostering and advancing sustainable aviation fuels as a program purpose. It also ensures that SAF projects are eligible for assistance under this section, further promoting its production and commercialization.