It is situated on the south side of Loch Mullardoch, at the end of Glen Cannich, about 60 km west of Inverness.

Beinn Fhionnlaidh is a very inaccessible mountain, some distance from the nearest road, so usually involves a long walk in.

One route is to start from the end of Loch Beinn a' Mheadhoin in Glen Affric, then follow a path up Gleann nam Fiadh.

From there follow a track along Glen Elchaig to Iron Lodge, then a path to the western end of Loch Mullardoch, at the foot of Beinn Fhionnlaidh.

An easier alternative is to travel by boat along Loch Mullardoch to the foot of Beinn Fhionnlaidh, then climb straight up.