Originally Posted by
IAN-UK
Throwing a bit of cash as the problem can simplify it !The Sofitel is connected to the landside area of your Heathrow terminal. They offer day-rates in the region of $200+, though prices can go crazy. It might be worth checking overnight rates: perversely these can be cheaper, and by the time you get to the hotel it will be within the generous interpretation of check-in times, and the overnight rate would allow you to stay beyond day-rate limit hour.
There are, of course, many other hotels around Heathrow with much lower rates: but none offer the convenience of the Sofitel
OP is flying AA from CLT so will arrive at T3 not T5 so the Sofitel would require a T3-T5 transfer
Given tired folks would likely prefer to get their head down quickly rather than faff around transferring immediately to T5 for an outbound to SIN that doesn't leave until late evening, I would suggest that the HGI at Terminals 2 & 3 is a better option, being only a short(ish) walk from T3 Arrivals to T2 and then through the short-stay car park.
Day Rooms are ~£130-£150 until 6pm, OP can then get themselves over to T5 after a refreshing nap and ensconce themselves in the BA lounge at T5B from where BA15 is most likely to depart