Using our lab only (for now) Best Time to Buy technology, we crunched the numbers on the mega holiday airfare sale mentioned earlier. The chart above (and below) shows American and Northwest (now Delta) average cheapest ticket prices for travel departing each week fo the next 7 months. The red line denotes the prices on these routes from Monday noon and the blue line from last night at 8pm (after the sale and matching of airlines).

• Notice the steep drop in average prices for travel before Valentine’s Day and specifically on Thanksgiving and Christmas

• A 10% or more average decrease translates into savings of $100 or more per person (unfortunately, some cities aren’t on sale)

• Between 50 cities, there are more than 1,200 city-pairs, and we check almost 10,000 airfares per airline per week!

Procrastinators are getting a break — so don’t wait too long to check out prices and don’t forget to compare airline fees for the total cost of your trip!