Go through your results for flights to Vanuatu in Pacific Islands with Netflights. The most popular airlines for this route are Qantas, with Qantas claiming the top spot. Although Qantas usually has the best prices, it's best to double check what's available for your travel dates.
If these flights are too expensive, try searching for a different time of year. So if your dates are flexible, consider looking at different times of year.
Vanuatu receives five direct and indirect flights every week, but the cheapest airline is normally Qantas. So, if the flights to Vanuatu don't work for you, you could always try searching for flights to other airports in Pacific Islands.
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.