The caveat is that the stay in Bangkok is just around 24 hours. There are plenty of dates in January 2018 and beyond.
It’s still a good prices just as a one-way, nobody forces you to take the return flight. Most sites offer a 24h free cancellation.
I only have a Citi card for Hilton currently but had no trouble registering for both.
5,000 Hilton points isn’t much so I would not go crazy about this one.
– Monarch Airlines has finally given up and leaving lots of UK passengers stranded – apparently there is a major operation in place by authorities to repatriate everyone
If you are affected don;t assume Monrach will fly. Instead look at your credit card insurance.