London to Sydney Flight CO₂
London Heathrow (LHR) → Sydney Kingsford Smith (SYD) · 16,990 km
Economy CO₂
~1,444 kg
per passenger · estimate
Business CO₂
~5,054 kg
per passenger · estimate
Distance
16,990 km
great-circle
Driving equiv.
6,876 km
petrol car (EU avg)
Live calculation
Calculate exact CO₂ for LHR → SYD
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Route analysis
London–Sydney: emissions in context
~1,444 kg
Economy CO₂
Per passenger, one way. Calculated using ICAO v13.1 with fleet-average aircraft for the 16,990 km route.
6,876 km
Car equivalent
Driving a petrol car alone at EU average emissions (0.21 kg CO₂/km). The LHR–SYD flight emits the same as this many kilometres driven.
1.4 yr
Tree absorption
Years of CO₂ absorption by a mature tree to offset one economy passenger's share of a LHR–SYD flight.
About the London–Sydney route
The LHR–SYD route covers approximately 16,990 km great-circle distance between London Heathrow in United Kingdom and Sydney Kingsford Smith in Australia. In economy class, each passenger is responsible for approximately 1444 kg CO₂ per flight direction, or 2,888 kg for a round trip — calculated using the ICAO Carbon Emissions Calculator v13.1 methodology with fleet-average aircraft and typical load factors.
Business class passengers on the same route emit approximately 5,054 kg CO₂ per direction — roughly 3.5× more than economy — due to the larger floor area allocated to each business class seat. The climate impact is further amplified by a Radiative Forcing Index (RFI) of 1.9×, which accounts for non-CO₂ effects of aviation at cruising altitude including contrail formation and NOₓ emissions.
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