In the case of SATA, it more or less doesn't matter when you book your tickets, prices don't change much and typically range from €120 to €180 for a return ticket on inter-island flights.
Flights from the Azores to the Canary Islands usually don't drop below €380.
Free flights around the Azores
Travellers arriving in or departing to the Azores from/to mainland Portugal or Madeira and using Ponta Delgada, Terceira, Horta, Santa Maria or Pico airports for arrival can use one free return ticket to any other Azores island from their point of arrival. The condition is that there must be a maximum of 24 hours between the arrival in Ponta Delgada and the departure to the other island, as well as on the return journey, if there is such a connection.
If you have purchased, for example, a ticket Prague - Lisbon - Azores, this service does not apply to you, the starting point must be in Portugal only.
You can make a bookingrequest on the airline's website.
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