Lewiston is approximately 45 minutes by car from Pullman, and Spokane is 75 minutes.
There is a shuttle service between Spokane airport and Pullman, details here.
To get to campus from the hotels, the Quality Inn and Holiday Inn Express both offer free shuttles.
The local bus service also runs between downtown and the campus, a single ride is $0.75. Schedule here.
Further information on travel to WSU can be found here
Map to the CUE building here (paid parking is available under the building)