To get to Fray Bentos from Montevideo in Uruguay, you can take route 2 to the city of Mercedes, then follow route 21 north until you reach Fray Bentos.
It can also be reached by river, since Fray Bentos is located on the banks of the Uruguay River and has a passenger port to receive boats.
In addition, it has an airport that receives private flights and charters.
See more about the location of Fray Bentos
See also information on Montevideo y Mercedes.