I would like to book a return flight over the Christmas period from London to Warsaw, so I know it will be very expensive. At this time only a few airlines (mostly the regular ones, e.g. BA and LOT) already sell tickets for that period (it is March). How can I figure out when the tickets will be released by other airlines (e.g. cheap ones - WizzAir and RyanAir have direct connection on this route), so that I can snatch one of the first tickets at reasonable price?
Please note that this question is mainly about when the first tickets will be released, and not so much about when they will be the cheapest.