This is from the Rockies Heli Canada site that flies out of the Cline River in the summer. From the Site it says $349.00 per seat, based on a full helicopter load, and they also charge $2.00/pound of baggage extra. If you're an experienced hiker it's one good long hard days pull from the Hwy to get there. Since the flood in 2013 the trail is pretty bad, lots of it is a slug up the creek bed. Definitely worth the hike in just for the views alone. The lake is well above tree line so don't plan or expect to be sitting by a campfire at night. Weather changes quickly up there so expect snow any day, especially since the lake doesn't open for fishing until Aug. 1. If you're not an experienced hiker the helicopter might be a better option.
http://www.rockiesheli.com/icefields-heli-fishing/