Flight options out of SIN
SQ 217 goes to Melbourne but only a forty minute window there.
TR 2182 to Krabi at 10.25
PR 502 to Manila at 10.30
TR 2106 to Bangkok at 10.50
ignoring Kuala Lumpur because they could have gotten there from SUB
AK 5343 to Langkawi at 10.55
MK 647 to Mauritius at 11.05
AK 5802 to Penang at 11.25
JT* 150 to Ho Chi Min City at noon
SQ 224 to Perth at 1.05
KE 643 to Seoul at 1.30 (in case Phil went there)
Matching this list with this:
So if Phil was in Terminal 1 departures around that time he could have been headed for:
Singapore CX 735
Bangkok CX 751
Seoul CX 418
Hanoi CX 1791
Phuket CX 6804
Kuala Lumpur CX 1727
Penang CX 693
Makes it likely the leg is in Singapore, Thailand, or Malaysia.