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Jiang Jing, a 30-year-old from Weinan, a fourth-tier city in Shaanxi province, went to her local city hall early in September to apply for a passport as she planned a trip to The Maldives with her husband the following month.

She was surprised to see so many people doing the same.

"I thought overseas travel was still rare for residents of my city, but I was completely wrong, " she said.

The World Tourism Cities Federation, a nonprofit, nongovernmental international organization organized voluntarily by tourist cities around the globe, said in a report last month that more than 100 million Chinese traveled overseas last year.

It concluded the country's small cities had huge potential for outbound tourism, although big cities including Beijing, Shanghai and Guangzhou, capital of Guangdong province, are still the largest sources of outbound tourism revenue at present.

Particularly, it identified residents of Tianjin, and Shandong, Jiangsu, Zhejiang, Fujian, Liaoning, Hubei and Sichuan provinces as having the strongest demand.

Dai Yu, marketing director of China's largest online travel agency Ctrip, said although Beijing, Shanghai and Guangzhou are still the top three tourist cities in 2014, the cities of Tianjin, Changsha, the capital of Hunan province, and Harbin, the capital of Heilongjiang province, experienced the biggest growths.

"Second and third-tier cities are definitely catching up with the big cities in terms of outbound tourism traffic," said Dai.

"Smaller cities grew 100 percent more than the bigger ones on average."

Ctrip bookings for overseas travel products from small city residents, meanwhile, increased a thumping 300 percent.

The National Day holiday period is considered peak season for outbound tourism.

A government official from the entry and exit administration in Nanchang, Jiangxi province, surnamed Zhao, said daily passport applications ran at an average of 400 in September, up from 250 in August.

To cope with the rise in numbers, new passports were processed in 10 days rather than 15, Zhao said.

Jiangxi authorities processed 477,000 passports in the first eight months of 2015, according to the administration.

Neighboring countries Japan, South Korea and Thailand remained the most popular destinations for short trips, while the latter two were also the top outbound destinations for residents of Jiangxi in 2014.

The reason given by travelers from small cities for sticking to nearby countries remains the tiring need to transfer through big cities, to go further afield.

The manager of a local travel agency in Nanchang said some local travel agencies and airlines are already cooperating on the running of more charter flights from there to other nearby destinations, including Taiwan.

Cheng Qian, the manager of Huaxia Travel Agency's business department in Sanmenxia, Henan province, said five-to six-day short-haul outbound tourism products are its best-sellers during the holiday.