Not sure about the museum only price. We booked the full tour which included the transportation from downtown Seattle, the factory tour and museum. The museum is only about 1% of the tour and seems to be open to the public. I didn't see any barriers to entering the museum and no one was asking for tickets. You're doing yourself a disservice if you make the trip and don't for the factory. It's the largest factory facility in the world under one roof. 97 acres of manufacturing in one building alone. You'll see Boeing aircraft from airlines orders from all over the world setting on the flight line waiting for delivery. Freshly painted with logos you won't recognize. It's just too much to describe, do the tour of the factory.
I called to ask since I will have to stay in the family area with my son, who is under 4 feet tall. It’s $12. My son is free.
Museum admission is free.
I think there is no ticket for the meuseum however the real fun is there in the tour only which cost $25
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