Here's some advice as you're making your travel plans this year.  A massive new study has figured out the SMARTEST time to book your flights.  And they're pretty easy to remember.  Check 'em out . . .

The best time to book a domestic flight is exactly SEVEN WEEKS in advance.  That's when the price will be the lowest.

The best time to book an international flight is THREE MONTHS beforehand. 

And the best time to book a trip for a holiday like Thanksgiving or Christmas is about 13 to 14 weeks in advance. 

If you want to fly somewhere very last minute, think international, not domestic.  International tickets are more likely to go DOWN in price the day or two before the flight.  Domestic tickets are more likely to go WAY UP.  And it doesn't matter what day of the week you book, but it WILL save you money to fly on a Tuesday or Wednesday.

(Yahoo Finance)