The average listing price for homes for sale in Federal Way WA was $325,460 for the week ending Sep 30, which represents a decrease of 1.9%, or $6,224, compared to the prior week.Schools in Federal Way.he average listing price for homes for sale in Federal Way WA was $325,460 for the week ending Sep 30, which represents a decrease of 1.9%, or $6,224, compared to the prior week. Schools in Federal Way.