Question : How long are most people's visits to Berlin when they fly in from Riyadh?
Answer : Of course you're not most people, but if you were, you'd stay roughly five days.
Question : If your plans are flexible, have you considered changing your departure day?
Answer : For the month of December, the cheapest day to fly is Sunday. Having flexibility in your travel plans means you can save, so be sure to plan ahead when possible.
Question : Are prices changing frequently for this route?
Answer : Prices for RUH to TXL do change more than most. The further out you book a route, the more likely you are to save.