About 68 miles or 109 kilometres.
Between Kells and Monaghan town it is about 48 miles or 76 kilometres.
It is about 117 kilometres or 73 miles between Donegal town and Monaghan town. It would take about 2 hours to drive. Donegal is a large county and Donegal town is one of the nearest points to Monaghan, so if you were travelling from other parts of Donegal, it could take a lot longer and you could add another hour or more to the journey.
It is in the north of Ireland, but not in Northern Ireland. What is known as Northern Ireland contains 6 of the 9 counties of the province of Ulster. Ulster is the northern province in Ireland. Monaghan is one of the 3 Ulster counties that are not in Northern Ireland. It is in the southern part of Ulster. See the maps at the links below.
Dublin is the closest of the three places mentioned.
It is 9122.4 miles
2252 miles
5392 miles
18.5 Miles, from Romford town centre to Chelmsford town centre.
5383 miles
it is about 6128 miles
7309.04 long miles
6285 miles