JDiver:
If you are booking in conjunction with a cruise, it is often advantageous to book one-way air travel via the cruise line's air travel program as they have access to one-way rates that are not available to the general public. I assume the airlines make these one-way rates available to them, but not generally in order to continue to charge high one-way rates to business travelers (who will not be cruising).
Last edited by rtpflyer; Feb 26, 2019 at 10:04 am
Reason: Reply to JDiver specifically, though may be of general interest