Directions from Dublin From: To: Leave Dublin onto the M4 Motorway. When the M6 (towards Athlone & Galway) and the M4 (towards Mullingar & Longford) divurge, take the M4. Continue around Mullingar and Longford on the M4 (becoming the N4 approaching Longford). Follow the N4 bypass around Longford, looking for the N5 turning towards Castlebar & Westport. Continue forward on the N5 going through the towns of Termonbarry, Strokestown, Tulsk, Frenchpark, Ballaghaderreen & around Charlestown on a bypass. Eventually arrive at Castlebar. Follow signs to Westport for approx 10 miles. Follow the directions as per the N5 Castlebar Road arriving into Westport. This route is 155 miles and should take around 3.5 hours (plus rest stops).