Is there a specific time that reward seats are released? Just spent some time trying to get seats, outward available but no return - but the person I spoke to said she can see a good number of UC seats available, so it’s likely more will be released. Is this as random as it sounds?
It’s very dynamic yes. But generally they will appear within a day or so of the flight going on say 330 days in advance. After that, once that availability has been depleted, reward seats come and go on a day by day basis depending on the flight load.
VS is very good at releasing seats in the 7 days running up to departure if the cabins are quiet. So if you can’t snag some, keep checking in the run up to the flight and you can often bag an upgrade.
Good luck.