In general, when looking for the cheapest flight to Da Nang, try to choose a flight departing in October for the best deal.
From most locations, booking your flights to Da Nang around 36 days prior to your departure date finds the best deals.
From most locations, the cheapest flights to Da Nang are found on a Tuesday. Booking a Friday departure is usually the most expensive.
On average you can find the best deals on plane tickets to Da Nang when looking for flights with midday departure times.