Originally Posted by
narvik
If you have a return ticket SIN-PKX-ICN anyway, it's easiest to just fly all segments.
I.e. just go ahead and fly the PKX-ICN-PKX portion; you've already paid for it.
(Note: It's PKX not PXK. PXK is Paxson, Alaska)
I'm guessing though that they want to stay in Beijing, not ICN. PXK is probably just a transit on that ticket. I'm guessing changing PEK to a stopover would increase the price of the ticket, obviating buying a ticket to ICN in the first place.