Originally Posted by Jorma

Here is my list of best OW lounges at SIN, maybe some people dont agree. I am OWE from AY.

1. QR Premium lounge. Very attentive staff, a la carte dining, good champagne and drinks options. Access here is granted only with business or first boarding pass, OWE will not get you in.
2. QF First. Best lounge if going with only Emerald status. Some might like it even over QR lounge. Solid drinks and a la carte dining.
3. QF Business. Sapphire status works.
3. BA Business. Sapphire status works. As always with BA outstation lounges, dragons might turn you away "because of capacity" if not flying BA or have status from BA.
Not visited CX lounge, as its in T4 and requires alot of work to get to. If you fly with CX, this is your best lounge or be prepared to leave other lounges more than hour before your departure. CX outstation lounges are generally very good. I assume this is also.
5. Marhaba lounge. Visited this lounge twice, nothing to write home about, basic 3rd party lounge (better than average tho). MH used this in december.