bus fares King County Metro To Charge Flat Rate Bus Fare By Paula Wissel • Nov 13, 2017 Jennifer Wing / knkx Listen Listening... / 1:06 King County Metro Transit fares are being simplified. Beginning in July 2018, bus riders will pay a flat adult rate of $2.75. The new fare system eliminates different fares for peak times and for traveling between zones. Metro youth fares going up By Paula Wissel • Aug 31, 2011 Oran Viriyincy / Flickr Kids will pay 50 cents more to ride the bus starting tomorrow. Bus fares on King County Metro increase from 75 cents to $1.25 to travel in all zones at all times.