In general, when looking for the cheapest flight to Dubai, try to choose a flight departing in March for the best deal.
On average, from most locations, when planning your trip to Dubai, try to book your flight in the region of 27 days in advance for the cheapest prices.
From most locations, the cheapest flights to Dubai are found on a Wednesday. Booking a Saturday departure is usually the most expensive.
On average you can find the best deals on plane tickets to Dubai when looking for flights with afternoon departure times.