The initiative – launched in 2019 – also boasts Booking.com, Skyscanner, TripAdvisor and Google among its supporters.

Expedia’s inclusion follows the creation of a new standardised framework by Travalyst to collect and display flight emissions data, in a bid to make it easier for customers to book a flight with lower emissions.

Travalyst confirmed all of its travel distribution partners, including Expedia, would implement the model in the near future. 

Chief executive Sally Davey said: “Driven by data and the core belief that travel is a force for good, Expedia Group’s platforms and data will enable Travalyst to help more travellers make better choices for themselves and the planet.”

Aditi Mohapatra, Expedia Group’s vice-president of global social impact and sustainability, added: “Our research shows travellers are looking for ways to minimise their footprint while traveling and support local communities and cultures, and we see travellers turning to our platform for inspiration and guidance to inform their decisions. 

“In partnership with the Travalyst coalition, our goal is to provide travellers with more responsible choices and align our business, and industry, towards a net zero future.”