But why let Kayak have all the fun? We went one further, analyzing their analysis to make these predictions that should help you travel smarter—and save money—in 2015.

Deals will determine destinations

Travelers suddenly fell in love with Milan in 2014, Kayak said, with the city's share of click traffic growing by an almost unbelievable 105 percent year over year. Airfares, though, have fallen an average of 13 percent, leading Kayak to declare the city the number one deal destination for 2015. (The October 2013 launch of Emirates service from New York’s John F. Kennedy International to Milan no doubt helped keep prices low.) With the Italian city hosting the World Expo from May through October, look for it to attract even more travelers this year. In addition to Milan, Hyderabad, Toronto, and Savannah appeared both on Kayak’s list of trending places and its list of best deal destinations. In general, travelers should monitor new airline routes as a source for deals on airfare. One good place to keep track of new options is Airfarewatchdog.

The ingredients will be local, the diners not so much

Five of Kayak's top ten trending destinations—Portland (third), Toronto (sixth), Savannah (seventh), Nashville (eighth), and Montreal (tenth)—are top North American cities for food. Joining a wealth of homegrown talent, established superstar chefs have expanded their empires to most of those cities in recent years as well, with David Chang now overseeing five Momofuku restaurants in Toronto, Hugh Acheson launching The Florence in Savannah, and Sean Brock bringing Husk to Nashville. As Americans' obsession with food continues to grow, so too will this trend. Keep tabs on emerging culinary destinations and make your travel plans—and restaurant reservations—before that up-and-coming chef ends up drawing national attention as a finalist on “Top Chef."

The best time to buy airfare to Europe is yesterday

Kayak suggests booking flights to Europe six months in advance to get the lowest airfare, a considerable change from their advice last year to book only eight to ten weeks in advance. As Condé Nast Traveler reported last week, a strong dollar is making European travel more desirable for Americans—at least once they get there. With airfares to Europe likely as high this summer as they were last year, deals, particularly at the last minute, will be scarce. If you do feel the sudden need to flee the United States, head to the Caribbean instead of Europe: You'll find the best prices just two to four weeks in advance, according to Kayak.

The most popular destinations in 2015 will be the most popular destinations of 2014 (and of 2013 and of 2012 and...)

You can probably guess the ten most popular domestic destinations of the year: New York, Las Vegas, Los Angeles, Chicago, San Francisco, Orlando, Denver, Washington D.C., Seattle, and Boston. Kayak’s findings here are nearly identical to every other recent list of the most popular places to go. One way to find a deal in these perennial favorites? Average airfares to most of these cities spike in the summer months, so simply visit in at a different time of year.

And airfare to those popular destinations will rise in July

The most expensive month to fly to nine of Kayak's ten most popular cities was July. (The lone exception was Orlando, where December sees the highest fares.) If you’re flying to one of those cities this summer, Kayak's data suggests that June or August will see lower ticket prices.