The clock
Head spa near Woodinville, booked for after the afternoon is over
Doors open at 10 AM and stay open until 10 PM, seven days a week, and a 90-minute session can still start at 8:30 PM. So a valley afternoon can run late. Redmond-Woodinville Road runs southeast out of town and lands you in downtown Redmond; the last leg is SR 520 west to the Overlake exits, or 156th Ave NE south when the freeway is stacked up. Two roads, 15 to 30 minutes all in, depending on traffic and the hour you pull out.
Deciding before you leave the valley matters more than the distance does. Point the car south while everyone is still standing in a parking lot and the drive reads as a transition, but decide an hour later from your own driveway and it becomes a second trip you will talk yourself out of. Book it from where you are. The open-late guide has the last workable start time for every length.
The corridor behaves the same way a few miles west. Guests coming down from the Bothell side land in Overlake off a comparable run, and the table-side version of that trip is covered on massage near Bothell.