The use of composite materials instead of metals for aircraft parts has long been identified as a way of improving their environmental performance, as weight savings reduce fuel consumption. In the context of environmental transition, it is important to improve the environmental impact of each step of the lifecycle. However, few studies have described the environmental performance of composite part manufacturing. In the present study, we therefore conducted a complete environmental analysis of the thermo-stamping of carbon-fibre-reinforced polyphenylene sulfide (CF/PPS) composite parts using a Life Cycle Assessment based framework. First, to define the system’s boundaries, the manufacturing process was described as a unit process sequence associated with the consumption and waste of materials and energy (i.e. elementary flows). Data were then collected from experimental measurements, databases, and literature for each flow. These data were used to produce an environmental assessment, highlighting the environmental impact hotspots of CF/PPS part thermo-stamping.