Singapore Airlines does have sale from time to time, but their Business Class fares hardly go on sale, especially outbound from Singapore! However, it is not uncommon to find Business Class sale fare from the other end!
As you can see in the screenshot above, the promotion is from now till 2 Jul 2019, and the travel period is rather generous, from 20 Aug 2019 to 31 mar 2020 for the higher fare, and a shorter period from 28 Oct 2019-15 Dec 2019 for the cheapest fare. However, I played around a little bit and it seems like you may still get the cheaper fare outside that travel period:
Minimum stay: 7 days
Maximum stay: 3 months
Minimum passengers: 1
Cancellation: Non-refundable with the exception of taxes
Booking Class: D (125% on Krisflyer)
Valid outbound flights: Valid on all our flights
Valid inbound flights: Valid on flight SQ334 only
Not unexpectedly, the cheapest fare is through Manila.
Do note that you will have to fly SIN-CDG on SQ334, which is a 777-300ER and features the 2013J business class seats.
Just in case you feel disadvantaged, the 777-300ER actually has the newer seat types! Just try to avoid SQ335 A380 (CDG-SIN) when you book as that features the older 2006J seat.
The best way to go above looking for the above flights will be to use Google flights as seen in the screenshot above, then click all the way to the last page to confirm the source of the cheapest fares (Singapore Airlines in this case)
D class credits 125% into most frequent flyer programs, but 200% on Alaska Airlines!
In case you are wondering why this post is relevant to viewers in Singapore, there will be an upcoming post to explain how to make the best of this SQ booking!