On a recent trip to further afield (Australia), we decided to break up the long flights by stopping in Hong Kong for the weekend. This is a great idea, and one we highly recommend when traveling further afield. For starters flying for 20+ hours is just unbearable, and secondly you get to see another destination for very little extra money. This is one of our favorite tips for saving money on flight.
One of the biggest costs when traveling is the flights, especially if you have children and can only fly during the holidays. Airlines are the masters when it comes to pricing based on supply and demand. Meaning holiday time flights are on average 2/3 times more expensive than other times.