Old Apr 22, 20, 7:48 pm
  #2  
BenA
 
Join Date: May 2009
Location: Seattle, WA
Programs: DL Diamond 1MM, UX Suma Gold, Marriott Bonvoy™️ Gold, Hilton Gold, Avis Preferred, Hertz PC
Posts: 3,686
There's very little reason not to book now, given Delta's current change fee waiver on tickets booked this month - if a better fare appears in the future or your plans change, you can always change your ticket without penalty.

Applying GUCs upfront is a mixed bag. They're likely to clear, but you will likely struggle to get them back if you need to change the ticket. I'd probably determine which of your trips is most likely to happen and plan to use them there.

Keep in mind that GUCs are only eligible on specific KE fare classes that are highly unlikely to show up right now, so you'll probably be in the back for ICN-HKG no matter what.
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