Thanks for the advice! I purchased a guide on Mt. Whitney, it suggests to fly into Bob Hope Airport. Do you still recommend Ontario over this? I will be leaving from Boston. Also, I think it's impossible to find a direct flight in.
I have no idea why a guide would suggest the Burbank airport. I think you'll find flights more $$ as well as the rentals. In terms of access to the Eastern Sierra - it's about the same as Ontario in terms of drive time. Am a big fan of SouthWest.
I doubt you'll find a direct flight unless you do a BOS/LAX, and then you have to deal with LAX and the longer drive across downtown LA. If I were saving a substantial amount of $$, I might consider it but otherwise - it's among my least favorite airports.