Hilton is running a flash winter sale for the rooms in Japan, Korea, Hong Kong and Guam for four days only, from 26 November 2019, 1pm (Singapore time) to 29 November 2019, 1pm (Singapore time).
While the marketing spiel reads 50% off, bear in mind that this discount is off the flexible rates and not the sale rates. Also, non Hilton Honors members will only enjoy 40% off. On top of that, you will be slapped with other terms, such as non-refundable terms.
While the sale period is tight, you have some flexibility in your travel dates. You can stay between 26 November 2019 and 30 June 2020, giving you quite a fair bit of dates to play with if you haven’t lined up any plans for the first half of next year. Obviously black-out dates do apply, and I will expect that the sakura season will be excluded given the traditional high footfall.
What’s good?
Tokyo traditionally has one of the most expensive hotel rates in Asia, so this is a good time to check out the properties if you have been hesitating. For instance:
If you are looking to book a ski holiday, Hilton Niseko goes from SGD125:

Conrad Tokyo is another exceptionally property that can command more than S$700, but for this sale you can grab rooms from S$356:

If you are looking at some other luxe properties in Japan, Conrad Osaka can be booked from SGD260, down from the usual SGD500+:

Elsewhere in Asia, Conrad Hong Kong is also on sale, from SGD180!

Are the rates really available?
I did a quick search for the rates for Conrad Tokyo (which I’m dying to check out), but it seems like the really low rates are quite hard to find.
For instance, during the Chinese New Year season in early February, you are quoted about JPY32,000 (JPY40,800 after taxes, or about SGD511) per night:

As for March school holidays, the lowest pre-tax rate is JPY25,000, which works out to about JPY31,825 or SGD400 per room per night, which isn’t shabby at all.

I tried the same with some other properties around Japan (and even Conrad Hong Kong!), while you may not always get the lowest advertised rates, the discounts are still significant.
In any case, do try your luck and play around with the dates if you have some time. Remember, sale ends 29 November 2019 at 1pm (Singapore time), so you might want to just lock in your plans quickly. Book here.