Flight
The closest major airport to Sun Mountain lodge is SeaTac. We recommend flying into this airport and then taking a rental car to drive to the destination (about 3.5 to 4 hours away).
Travel Note
For the best experience we recommend going north on I-5 then taking highway 20, which is often referred to as the North Cascade highway and taking time to look at Diablo Lake and viewpoints along the way. On the way back, we recommend making a pit stop in Leavenworth which is a beautiful German town full of great food and views.