You can use Google Maps below or see the details just under it:
Directions from Montreal: Take the Ville Marie expressway West and follow directions to Lasalle/Pont Mercier Bridge. Cross the bridge and follow exit towards Chateauguay. Take first exit into Kahnawake, then a right and follow road to the river.Turn right and drive about 1 minute to the church. You can also take the Citso bus from the Angrignon Metro station. It runs Monday to Friday and at various times.
From Ontario: From HWY 401: Take highway 20 east to Autoroute 30 East (Sorel-Tracy), to extit #44, turn left onto Rte.207, 8 kms. to River Road, turn right , Mission is on left.
From HWY 417: Take highway 40 east to Autoroute 30 East (Sorel-tracy), to exit #44, turn left onto Rte. 207, 8 kms. to River Road, Turn right , Mission is on left.
From the U.S From HWY 87 : Take highway 15 North to Autoroute 30 West (Vaudreiul-Dorion) , to exit #44, turn right onto Rte. 207 , 8 kms. to River Road, turn right, Mission is on left.
From Quebec: Take HWY 30 towards route 132/138 west in the direction of Chateauguay and the Mercier Bridge. Follow direction as above from the U.S.
By Bus: You can find the latest bus info and schedule at the following link :http://citso.org/en/route-listings-schedule/