Coming From...  

Coming from Limerick (1hour 20min)
Leave Limerick in the direction of Galway until you get to Ennis (takes 35 minutes). In Ennis, look for signs for Ennistymon or Miltown Malbay. Drive to Ennistymon (takes 35minutes). From there follow signs for Lahinch (takes 5 minutes).
Coming from Galway (1hour 30min)

There are many ways from Galway to Lahinch.
The one we find the best and quickest is.. Leave Galway in the direction of Ennis and Limerick until you get to Gort(35mins). In Gort turn right in the direction of Corofin(30mins). The roads are quite narrow this way. In Corofin go in the direction, Ennistymon(25mins) or Miltown Malbay. From Ennistymon take the directions to Lahinch.

From Dublin (4 hours+)

Usually the best way from Dublin to Lahinch is via Limerick. See directions from Limerick for this.

Alternatively if you have a map… On the road south from Dublin to limerick, probably 30 minutes before you would arrive in Limerick, there is a turn right to Broadford (you will need to look at a map). Taking this road towards a crossroads before Tulla, then turning left (west) will save you having to pass through Limerick town, which may save you an hour on your journey. The road is quite narrow initially but the stretch that goes from Tulla to Ennis is very good. This road brings you to Ennis, see directions from Ennis to Lahinch above.
From London via Shannon
Lahinch Surf School is located 40 minutes from the international airport of Shannon in the west of Ireland. Driving from Shannon, go in the direction of Ennis or Galway. In Ennis drive in the direction of Ennistymon, Lahinch is 2km from there. There are many daily flights to London with ryanair.com and aerlinus.com.