The advice was shared by TravelGov, an official travel information platform of the US Department of State, which urged travellers to verify entry requirements well ahead of their trips to avoid unnecessary disruptions. The US advised travellers to check passport validity before international trips. Photo: GettySource: Getty ImagesWhy Are Travellers Denied Entry? According to the advisory, one of the most common reasons is travelling with a passport that does not have enough validity. TravelGov encouraged travellers to review country-specific travel guidance before every international trip to reduce the risk of being denied entry on arrival.