Overall, New Zealand hotels cost an average of $171 a night over the first half of 2015 - up 9 per cent.
The biggest increase was in Auckland, where the average price of a room booked through the website jumped 16 per cent to $171 per night.
A Hotels.com spokeswoman said the rise across New Zealand was driven mainly by a higher demand for accommodation during events such as the Cricket World Cup.
Areas where matches were played included Dunedin, which saw a 4 per cent rise to $158, Christchurch, up 2 per cent to $167 a night, and Wellington, up 10 per cent from $148 to $164.
Other New Zealand cities with strong increases included Queenstown (14 per cent to $226), Te Anau (11 per cent to $158) and Palmerston North (12 per cent to $133).
Blenheim was the only region to experience a decrease in hotel prices, down 1 per cent to $166.
Across the ditch, Cairns hotel prices fell 16 per cent to $155 a night. Brisbane also saw a decrease, of 12 per cent to $176 per night.
The cities with the biggest price hike for Kiwis booking accommodation through the site were Washington DC, up 25 per cent to $273 a night, Nadi up 20 per cent to $255 and Shanghai, up 20 per cent to $255.
In San Francisco the price of a room jumped 17 per cent from $266 to $311 a night.
A spokeswoman for Hotels.com would not say how many hotels could be booked through the website either in New Zealand or worldwide.
But a quick count online revealed that Invercargill alone had at least 31 hotels, motels, bed and breakfasts, serviced apartments and motor lodges available.