There's understandably more focus on where best to start an DONEx or AONEx, but after several of those I'm considering a LONEx as a way to get from the UK to Australia in late Dec via a stop in the US (I'll use miles to get back from Asia). I have an expert flyer account but have no sense of which places are cheap for starting in economy. Any pointers?

So far I have (priced in USD via expert flyer for ease of comparison):

UK:
LONE3 2342.96
LONE4 2733.46
LONE5 3319.20
LONE6 3904.94

OSL:
LONE3 2093.68
LONE4 2480.65
LONE5 2877.58
LONE6 3274.39

NRT:
LONE3 2971.79
LONE4 3145.66
LONE5 3715.17
LONE6 4302.44

(LONE3 prices for more expensive places than OSL: ARN 2152.01, AMS 2425.10, CPH 2420.19, PRG 2596.25, KUL 2690.61, SIN 3403.43, PVG 3482.35, HKG 3630.30, JFK: 3599.00)