Peak-season prices for overseas tours are about 10 to 20 percent higher than at other times, Wang said.

Overall, prices are about the same this year as last, but trips to "hot destinations" such as Europe cost more.

"Prices are up by 10 to 15 percent on some itineraries to Europe, which means about 2,000 yuan ($326) more than last summer," said a staff member at Tuniu.com, a Chinese online travel agency.

As Chinese travelers gain more experience with overseas trips, "depth tours" to a single destination are popular this summer for the first time, some business insiders said.

Russia, Switzerland and the United Kingdom are the best sellers in this category, according to Tuniu.com. Outbound travel numbers to Russia were up 120 percent as of July 9, compared with the same period of 2012, the website said.

"Depth and theme tours are drawing the most attention this year, which is a new thing in the summer market," said Zhang Lei, general manager of UTour International Travel Service.

Zhang said the depth and theme tours to Europe account for 70 percent of the agency's tours to Europe this summer.

Leisure tours including island and cruise tours are new favorites with families, Zhang added.

Chinese travelers taking cruises mainly go to Japan and South Korea, which are near to China. The whole trip usually takes five days.

Airlines operating international routes in China also get a piece of the pie in the peak season of Chinese outbound tourism.

Air fares on the China-US routes peak in July and August, and passengers have to buy tickets several months in advance to get a discount, said Li Xiaojin, a professor at the China Aviation University in Tianjin.

"Definitely, July and August is the strongest season for outbound traffic from China," said Stephan Linhart, a sales executive at Austrian Airlines AG.

Linhart said China is the airline's second most important market in Asia after Tokyo. The carrier just invested 19 million euros ($25.2 million) to upgrade the business class sections on its 10 long-haul aircraft flying between Beijing and Vienna.

The airline also plans to expand its service between Beijing and Vienna from the current five flights weekly to seven within two years, he added.