Tefler86.
From what I am reading on WA Gov. Dept. Health's website not even WA Citizens can reenter WA during the border closure.
The ONLY persons allowed to enter WA are covered under the " persons exempt " list and Travel outside of the State by a Citizen of WA and return from a Holiday is not one of the exempt persons .
Domestic Airline Travel is rather chaotic ATM and will remain so until at least end of the year , maybe some easing for Xmas Holidays.