The Foreign, Commonwealth and Development Office (FCDO) provides guidance on COVID and non-COVID risks overseas. The FCDO currently advises against all but essential travel to many countries and territories on the basis of COVID risks. You should check the travel advice for your destination.
Travel disruption is possible worldwide. Other countries may bring in new measures with little notice such as border closures, movement restrictions or quarantine rules. Travellers should be prepared to stay overseas longer than planned.