So where does, or could, the taxes of $800 one-way to Asia come from, as stated by the OP? Even if that was in F I doubt it could be that high.
The figures you state are far more in circumspect of what I was thinking. Maybe an inch higher.
No idea, official YQ breakdown for POS = Australia
Route
New surcharge from 08 March 2012 for Point of Sale Australia
Per sector
Suites, First Class
Business Class
Economy Class
A. Between Singapore and South East Asia (Brunei/Thailand/Philippines/Malaysia
Indonesia/Vietnam/Cambodia/Myanmar)
B. SQ code share flights with MI
between Singapore and South East Asia
C. Between REP and PNH/DAD D. Between DXB and CAI
E. Between IST and ATH
F. Between MUC and MAN
G. SQ code share flights on other airlines
• On YVR-SFO v.v.
• Within USA (domestic)
• Within New Zealand (domestic)
• Within U.K. (domestic)
• Within Germany (domestic)
• Intra-Europe
• Within South Africa (domestic)
USD 64
USD 55
USD 38
A. Between Singapore and
- South West Pacific (Australia/New Zealand) - China/Taiwan/Korea
- South Asian Subcontinent
(India/Bangladesh/Pakistan/Sri Lanka/ Nepal/Maldives)
- Middle East
(Egypt/Saudi Arabia/United Arab Emirates)
B. SQ code share flights with MI
between Singapore and China/Taiwan/ South Asian Subcontinent
USD 158
USD 140
USD 120
A. Between Singapore and Europe / South Africa B. Between FRA and JFK
C. Between DME and IAH
D. Between SEL and SFO
E. Between BCN and SAO
F. SQ code share flights on other airlines
• FRA/LON - Canada v.v.
• FRA/LON - USA v.v.
USD 222
USD 208
USD 183
A. Between Singapore and USA (LAX/SFO/JFK/EWR/IAH)
B. Between SIN and SAO
USD 334
USD 321
USD 302
Between Europe and Australia / New Zealand
(Applicable to transfer fights via Singapore only, not involving stopovers.)
USD 329
USD 309
USD 273