AF/KLM Business Class Europe to SIN From $2,028
 

It looks like AF/KLM have joined in on the good Business Class fares to Singapore - the departure points that I noticed are AMS, DUS and FRA.

AMS Departures Headline info:

Routes: AMS-SIN-AMS or AMS-CDG-CDG-AMS (or a combination)
Fares: From $2,028
Book by: None specified in the fare rules
Stay: Min 6 nights Max 1 Month
Availability: January - August 2016

If you want to see availability for Jan-Aug but don't want to use ITA Matrix then I've posted screenshots to the blog here.

DUS Departures Headline info:

The departures from DUS don't have nearly as much availability as the ones from AMS (above)

Routes: DUS-AMS-SIN-AMS-DUS/FRA
Fares: From $2,025
Book by: None specified in the fare rules
Stay: Min 6 nights Max 1 Month
Availability: January - August 2016

If you want to see availability for Jan-Aug but don't want to use ITA Matrix then I've posted screenshots to the blog (see above for link).

All fares found using the ITA Matrix search.