The air ambulance service gets 89% of its funding from public donations and is launching the campaign, Up Against Time today.
It comes as the charity shared they need to raise £15 million by 2024 to replace both aircraft after news they are becoming increasingly difficult to maintain.
Only 38% of Londoners know the service is primarily funded by public donations, this is after 36% shared that they think the service is funded by the NHS or central government.
However, the organisation shared that its role includes getting medics to the scene quickly so they can provide complex treatment to critically injured patients with life-threatening or life-changing injuries, who do not have time to make it back to the hospital.
Last year, London Air Ambulance assisted 1,714 patients at the scene – an average of five a day.
Those wishing to donate can do via the London Air Ambulance website here: https://www.londonsairambulance.org.uk/time