Flight
Flights to Seattle (Seatac) or Spokane are the cheapest. East Wenatchee, the sister city does have an airport but flights are very expensive. Wenatchee has a shuttle to/from Seatac (Wenatchee Valley shuttle) https://www.wenatcheevalleyshuttle.com/ which runs multiple times a day for $72.80 per person per way.
Travel Note
Bus service in Wenatchee is free, but not good at Sunnyslope on the weekend. We do not recommend relying on the bus.