You need to look to see if there are saver awards available to Alaska members to know if the space is available to partners. If you look at the alaskaair.com award search and see awards at the following level they should be bookable using the miles of Alaska's partners

Continental US including Canada and Alaska is 12.5K miles each way for coach and 25K each way for first class

Hawaii is 20K each way for coach and 40K each way for first class

Intra-State awards (All awards are based on travel within one individual state, including Alaska, California, Idaho, Montana, Oregon or Washington) 7.5K each way for coach or 15K each way for first class