Also keep in mind that SQ award booking engine via the website is plain rubbish. Even for simple redemptions like SIN-DPS or vv. I often do one search for a date, then I change the date then go back to original date to play through different options. If in search one I saw 2 Eco Saver seats for the 9:40am flight then by the time I get to search three for the same day again those seats are gone or show waitlist or the morning flight does not show at all. Only way to get clarity is to fully start a fresh search from the very beginning and not do date changes or cabin changes etc. Then magically the 2 Eco saver seats for the 9:40am SIN - DPS reappear.