Go through your results for flights to Pekanbaru in Indonesia with Netflights.
Flexible on dates? Conducting your search by month allows you to compare prices to Pekanbaru throughout the year. Accommodation prices will also be higher at this time of year.
So, if the flights to Pekanbaru don't work for you, you could always try searching for flights to other airports in Indonesia.
Looking at a few different departure airports will give you even more choice. See what you can find. And remember, it's best to book your flights in advance wherever possible.