John Plimmer wrote:

For the times of flights you have to look up the LAN airline schedules. They
are the only scheduled airline flying there apart from the odd Chilean
airforce activity.
See www.lan.com
Ya, there are only one or two flights a day depending on the day of the
week.

Mark from Auckland NZ gave me the frequencies a year or two ago, but I can
no longer find them = sorry.
One was 8867USB MWARA SP, and the other was 5 megs, perhaps 5643?
Working that freq. he found "Pascua Radio" and "Tahiti Radio" in Spanish wkg
LAN a/c.

Yes, looking at my map, both those freq's cover SP including Isla da Pascua.