When is the cheapest time to travel to Australia?

We have summer or winter, and the seasons in Australia are just the opposite. Winter and summer are just off-season, so they are cheap. But I suggest you go in spring and autumn. Traveling is not for cheap, the cheapest thing is to stay at home. It deviates from your original intention, as long as the price is lower. Don't change your purpose just because you want to be cheap!