There are a variety of factors that will determine your vanpool fare. The transit agency, the number of days you want to commute, the mileage of your commute, and the number of people in your van will all contribute to your vanpool fare.
You can check out the Pierce Transit vanpool fares here or the Intercity Transit vanpool fares here. Riding with a different transit authority? You can find vanpool fare information on their websites using the links in the LEARN section above.
There may also be discounts available through your work by choosing to vanpool to work. Contact your HR, Employee Transportation Coordinator (ETC) or your transportation team to find out if your employer provides a transportation benefit for vanpooling.