My girlfriend and I (we are Croatian citizens) are going to visit Bucharest, Romania and we plan to stay there for 1 week. We will be traveling from Croatia to Budapest, Hungary first and from there we will take a plane to Bucharest.
Can we do this with our ID cards from Croatia? I did some research and we should be able (from what I found). Since this will be our first flight I just wanted to be sure since she and I don't have valid passports (they expired).