Fares change seasonally, so current fares for all WSDOT ferry routes, and vary based on length and type of vehicle: https://www.wsdot.wa.gov/ferries/fares/ Vehicles pay in both directions, passengers/pedestrians and bicycles pay only from Mukilteo to Clinton. Fares also increase during the peak late Spring and Summer months, so it is worth checking each time you cross. Average vehicles will pay $10-13 (rounded up) each direction. Passengers are $5-7, less for youth and seniors. Multi-ride passes reduce the per-ride cost, but expire after 3 months. Passenger passes are monthly, providing 31 crossings onto Whidbey.
Scot Harkins is absolutely correct.
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