In general when looking for the cheapest flight to Qatar, try to book your flight during the month of March for the best deal.
On average, from most locations, when planning your trip to Qatar, try to book your flight in the region of 48 days in advance for the cheapest prices.
In general, booking your departure to Qatar for a Friday represents the best deal on airfare. Try to avoid a Sunday departure to stay away from the highest prices.
On average you can find the best deals on plane tickets to Qatar when looking for flights with midday departure times.