There are multiple portals that offer you the plane tickets in cheap and best price. Dubai has multiple portals like @Tajawal
@Cleartrip Office @flyin @almosafer and many other. You can check for the latest offers that these portals are offering to get the best discounts on your ticket bookings anytime. If you want you can even check the coupon site https://www.rezeem.com/ which will help you in accessing the latest all travel offers available in middle east region.