Go through your results for flights to Medan in Indonesia with Netflights.
If you don’t have set dates for when you want to fly to Medan, try searching by month – that way, you can compare airfares throughout the year.
So, if the flights to Medan 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.