Booking Asia with Europe stopover

Chum

Level 2 Member
I am trying to book this trip for June 2017 using United miles

1. SFO-EWR-ATH (stopover)
2. ATH - VIE-HKG (destination)
3. MNL-ICN-HNL

economy on the 1st two lets and business on the way back... 100K United miles. Would it be possible to add HNL to SFO for less miles? Is that a valid routing?
 
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