Four days total? That seems pretty short to me but I guess if you just want to see Nuuk or say you have been to Greenland. I am going for two weeks (only leave I have left for next year else I'd do longer). Going to work out the details today but looking at 4-5 days in south seeing Viking ruins among other things and 4-6 days in Ilulissat/Disko island area and then a few days at end to do Nuuk and mostly to build in a buffer for return flight. Everything I have read (and honestly compared to most locations there isn't much reference material) is to get out of Nuuk but that will almost assuredly involve a flight and be aware they ain't cheap. I am going to easily spend more on my intra-Greenland flights than getting there.

Looked at cancelling (I booked fully refundable fare) and booking on points but for most dates adding a 90 minute flight to/from my local airport makes the cost 70k each way. 30k for a 90 minute flight in Y is a bit rich. Normally I'd just do separate bookings on another carrier but my outbound date is a high demand date towards the end of August and cash costs are high and any saver Y DL/AA has long since been taken. And since I need to burn down my Travel Bank I'll stick to cash booking for moment.