Hotel prices are going up. According to the Hotels.com Hotel Price Index, the average price of a hotel room in North America rose 3 percent during 2013, which is a reflection of room rate increases around the world.

"The three percent uptick in rates paid in 2013 - while slightly lower than the levels North America saw in the past two years - speaks to the steady growth of our region's hotel industry," said Neha Parikh, vice president and general manager, Hotels.com North America. "As consumers increase their reliance on mobile devices for travel purposes, mobile booking  apps are making last-minute travel more accessible than ever before and are driving consistent hotel demand in North America."

The three percent increase wasn't as much as in previous years. In both 2011 and 2012, the price increase rate was five percent.

Hotels.com found that the 10 Most Popular Domestic Cities for Americans, including Las Vegas, New York and Orlando, hasn't changed. However several locations in the U.S., like North Carolina and Florida, increased in popularity.  

The index also found that the most popular international cities for Americans to visit were London, Paris and Toronto.

The index found that Americans paid the most in Honolulu, HI, New York City and Boston. They paid the least in Macon, GA, Yuma, AZ and Dothan, AL.
Internationally, Americans paid the most for trips to the countries of Maldives, Anguilla and French Polynesia. The most expensive cities included Bora Bora, Soufriere and Mahe.

Hotels.com advises Americans to use now as a good time to travel to Europe. The site says visitors can likely expect four-star hotel room prices for under $135 per night in several popular cities. In 2013, Prague, Czech Republic ($124), Lisbon, Portugal ($127) and Berlin, Germany ($131) were just a few cities where travelers could find the Best Values in the World at highly-rated hotels.