What time of year are you doing this?
I believe I-5 - I-80 - US 95 is quickest. If you're looking for something a little more scenic, then you can take US 395 south from Reno and cut over.
Thanks for the reply - we're planning to do it next month. Google suggested three routes of which the first is shortest (17.5 hrs)
2) I-84E and I-15 S
3) US-95 S
You're looking at 18+ hours any way you cut it; if it was me I'd avoid the I-5 corridor altogether and take I-90 to I-82/84 to Salt Lake then I-15 the rest of the way. Maybe an hour or two (tops) longer than via US 93 or some such N/S road in Nevada, but easier on the system and more places to pull over for a catnap should the need arise.
Note this is assuming the trip is not in midwinter, when mountain passes can be troublesome.
I would choose the route through Salt Lake as well in July. US 95 in Nevada is just awful at that time of year. It's prettier too.
Thanks for the responses! The trip is next month so weather should be ok.
Colinaz, just so I'm understanding correctly - what makes US 95 awful? My guess is that its a hot, barren drive but wanted to make sure :)
Right. There's just nothing on it. Even the towns suck. It gets very boring.
Have you checked Southwest, Allegiant or Alaska for cheap flights? With the rental car and gas, it might be a better idea.
The original plan was to make a one-way road trip out of it with while stopping by in a few places. Then we changed our mind and decided we'd like to get there as quick as possible :).
I don't know where us95 comes from. Our perferred route is to take the interstates to Twin Falls and then hit us93 through the desert. 93 most is 70 mph max and shortest to Las Vegas imo.