Travel Note
If you are driving from Seattle to Leavenworth, please check the weather conditions first. Sometimes they require snow tires/chains/or close the pass due to weather.
Train
Train
There is a light rail that can take you from SeaTac Airport right to King Station in Seattle to catch the Amtrak train to Leavenworth/Wenatchee. You would get on at SeaTac station and get off at the International district/Chinatown station. Nearby is the King Street Amtrak station.
Flight
Rental Car
Rental cars can be hard to find in Wenatchee, make sure you book ahead of time and choose one with AWD. Hertz is closed on Sat/Sun. Expedia is closed on Sunday. Your best bet for a rental car in Wenatchee is to get it on Friday.
Rental Car