This paper study the feasibility of a monetary union among Gulf Cooperation Council (GCC) countries, by measuring the evolution of economic integration among them. Considering the critical role of crisis and shocks in the integration process within the region, we determine whether GCC countries are characterised by a common business cycle. We suggest a different empirical approach that, unlike previous studies, allows one to endogenously detect structural changes in the comovement process between outputs. We apply a new measure for this region that is based on the time‐varying coherence function. Such a measure not only detects comovement dynamics but also distinguishes these dynamics in terms of short‐ and long‐term cycles. Additionally, we can test whether certain countries tend to be more synchronised. The main finding of this study is that not all GCC countries share a common short‐term business cycle. However, in the long term, all country‐pairs indicate a medium‐level synchronisation in the most recent subperiods. The new role of the United Arab Emirates’ regional trade platform allows it to strengthen long‐term business cycle comovement, thus differentiating it from other GCC country‐pairs that have shown a decline in the last two subperiods.