I am arriving to Bucharest Otopeni airport on June 27. What is the easiest way to get to Sibiu?
There are direct shuttle vans from the airport to Sibiu (check schedules on https:/… ) and a few buses ( https://mementobus.com/en ).
You can also take similar shuttle buses from the airport to Brasov then buses to Sibiu, see the autogari.ro site above for schedules.
Another option is to take bus 780 from the airport to Bucharest North station then a train to Sibiu ( timetables on https://www.cfrcalatori.ro/en ).
Basically the easiest option depends on the specific time you'll be arriving at.