We investigate how end-to-end fidelity in quantum networks depends on the relative entropy of coherence under amplitude damping and depolarizing noise, as well as how it degrades with an increasing number of swapping operations. Analytical models reveal that while purification improves fidelity, it offers diminishing returns as the number of purifications increases. Our results show that depolarizing noise yields higher fidelity than amplitude damping for the same relative entropy of coherence. This framework enables coherence-aware routing using only fidelity measurements, providing a foundation for future routing protocols in quantum networks.