KAYAK, a popular OTA poured hours of time and analysis into figuring out when to tell travelers when was the best time to travel anywhere while saving money on accommodations, flights and out of pocket expenses when you get there.
A comprehensive report was generated you can read here.
The report identifies wallet-friendly trips, when to fly, beaches, the trendiest places people are going and more. For example it reports domestic flights are the most expensive on February 17th and the least expensive on February 4th.