JCBR wrote:I don't understand why but PE to HKG is sold out for weeks ahead. I have also been struggling to get seats.
The fact that your friends are holding the cheapest of the PE tickets means that only if that fare class is available will they be able to have a seat so there may be other PE seats available but they will not be allowed to book them.
Even the full fare W seats are sold out for the next few weeks.
I have a feeling that PE is sold out because of the fast approaching Summer Holiday season for schools.
JCBR wrote:Options are : use the K ticket later (within 12 months) and buy a new ticket on SQ. If you buy a one way that will probably be a full fare ticket. However, you could buy a roundtrip on SQ which would work out cheaper than a one way, then use the VS K ticket to go with the other half of the SQ ticket.
Just to weigh in on this option, date changes are usually acceptable with K class fares, but you will need to select the date at the time you call VS and you will also be liable for any change in fare costs.... they could get quite pricy if there is low availability and you would not wish to do this more than once.
There is also the admin fee per ticket to consider and as this is the first leg of the trip, it would be affecting the entire booking - all 4 segments from LHR - SYD and back again ii)
It sounds like you are suggesting nesting fares across airlines..... a tricky thing to balance out and definitely not the cheapest option to pull out of the hat for only 2 days. Plus when you miss the outbound VS flight from LHR - HKG, that entire booking is cancelled. Would lose all the VS flights then

Def better (and a lot less hassle) to head on over to HKG for those two days 8D