The simplest and quickest way is to fly. You could also get a ferry to either Holyhead or Liverpool and travel on to Manchester from those places.
Dublin is larger in size than Manchester.
From Dublin in Ireland to Manchester in England the flight time is about 50 minutes.
You would fly east from Dublin to Manchester airport. The flight time is less than an hour.
About 195 miles
none
About 45 minutes.
it is 166.31 miles
About 40 minutes.
The city of Dublin is in Ireland. The other three cities are in England.
None directly, though you can go via the UK i.e. Belfast > Manchester > Dublin Most people get the train or even the bus as it takes around 1 hour on the express service now that the roads are finally sorted.
Glasgow Birmingham Dublin Cardiff Manchester London
165.64 air miles