Go through your results for flights to Terceira in Portugal with Netflights. Although TAP Air Portugal usually has the best prices, it's best to double check what's available for your travel dates.
Flexible on dates? Conducting your search by month allows you to compare prices to Terceira throughout the year. Accommodation prices will also be higher at this time of year.
But if you're struggling to find flights to Terceira that work for you, try looking at other airports in Portugal.
For even more options, check what other airports you could fly to Terceira from. You might be able to make a saving by going from a different airport or city.