Pavement cracking is a pervasive and concerning issue within the realm of civil engineering infrastructure management. Reducing pavement cracking is essential to extend the lifespan of road surfaces, minimize maintenance costs, and ensure safe and efficient transportation networks. Various methods and strategies are employed to mitigate pavement cracking. The use of geosynthetics in pavement building improves pavement construction by providing sustainable and reasonably priced materials. Among different geosynthetics, geocells are most frequently employed to strengthen pavements. The use of coir geocells in pavement construction and rehabilitation offers several significant benefits, contributing to the durability and sustainability of road infrastructure. An essential component of pavement performance and design is their flexural behavior. This work used a three-layered beam model setup to examine the flexural behavior of Coir geocell-reinforced material. Coir geocell with varying aspect ratios (0.5, 0.62, and 0.87) and different infill materials (sand and aggrergate) was compared with unreinforced one. Geocell with aspect ratio 0.87 shows lesser deflection irrespective of infill materials used. As height of geocell increases deflection in the beam is reduced. Geocell with aggregate infilled material shows lesser deflection compared with sand. When compared to an unreinforced aggregate infill material, the deflection at maximum load level is decreased by 6.3%, 12.3%, and 20.9% for sand, and by around 12.8%, 23%, and 32.6% for aggregate infill material reinforced with geocell of aspect ratio 0.5, 0.62, and 0.87.