Spain, one of the hardest-hit countries in Europe, is waiting until July to lift most of its travel restrictions. That list hasn’t been finalized, Mr. Muñiz said in an interview, but it will probably include most European nations, and could be expanded to a select group of countries from outside the region. (The country’s land borders with neighboring France and Portugal are due to reopen on June 22.) He added that Spain has asked the European Centre for Disease Prevention and Control for specific guidance on how the country should draw up its list. “When you talk to epidemiologists, what they tell you is that if you have these two containers with equivalent amount of Covid risk, it’s almost irrelevant if there are transfers of movement of people from one place to the other,” said Mr. Muñiz.