Scoot topped Cirium’s 2025 emissions ranking at 51.0 grams of CO₂ per available seat-kilometer, securing Gold status in the new Emerald Performance Tier.
Scoot recorded 51.0 grams of CO2 per available seat kilometer in 2025, the lowest figure of any carrier in the Cirium Flight Emissions Review and a Gold tier position under the new Emerald Performance Tier, ahead of Wizz Air at 52.9g and of TUI Airways, Air Europa and Frontier Airlines behind it.
What makes the result interesting is that Scoot’s aircraft average 6.7 years, roughly two years older than the fleets of Wizz Air and Frontier, both of which finished lower down the table. Fleet renewal is normally the first explanation offered for a strong emissions intensity figure, and in this case it explains very little.
Scoot flies from Singapore Changi across Southeast Asia and into India, China, Japan and Australia, pairing Boeing 787s on the longer sectors with A320-family aircraft on the shorter ones, which gives it a network covering a wide span of stage lengths and demand profiles with aircraft matched to each rather than to a single template. (....)