Ib, Sjo-pty
 

According to the *.pdf and the desktop timetables IB operate a SJO-PTY (and vice versa) service on the end of either their BCN/MAD - SJO/PTY services.

Does anyone know if the SJO-PTY, or vice versa legs are bookable seperately. Expertflyer, & Expedia don't appear to believe the flight exsists, but the timetables published by OneWorld clearly do.

has anyone ever booked one of these flights, albeit paid or on a OneWorld RTW ticket?

Yes, they are.

Do you know where I can book them online? Or, will I need to contact Iberia directly?

Cheers

For bookings I think your best bet is to contact Iberia direct, particularly since it is not a daily flight.

All I did was to check availability and price for SJO-PTY using the first online website I came up with (rumbo.es, in this case) and could see that the IB flight was valid and priced. I didn't check the return flight, but if it exists then it stands to reason that it should also be valid.
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Those flights are showing up in EF, it's just not daily as mentioned.