Top list · Worldwide
Sustainable aviation startups worldwide
26 sustainable aviation startups worldwide have raised money in rounds we track. These are the 26 that have raised the most, $491M between them, with the United States the most common home.
- 1
Heart AerospaceHeart Aerospace is a manufacturer of hybrid-electric regional aircraft, focused on creating sustainable air travel solutions.Heart Aerospace is a manufacturer of hybrid-electric regional aircraft, focused on creating sustainable air travel solutions.
Founded 2019Torrance, Sweden$107Mlast round Feb 2024 - 2
Reaction EnginesReaction Engines is a British aerospace and engineering company founded in 1989, based in Culham, Oxfordshire.Reaction Engines is a British aerospace and engineering company founded in 1989, based in Culham, Oxfordshire.
Founded 1989Abingdon, United Kingdom$93Mlast round May 2023 - 3
LanzaJetLanzaJet is a private company founded in 2020 that focuses on sustainable fuels technology.LanzaJet is a private company founded in 2020 that focuses on sustainable fuels technology.
Founded 2020Chicago, United States$67Mlast round Oct 2026 - 4
XFuelXFuel produces sustainable and net-zero road, marine and aviation drop-in fuelsXFuel produces sustainable and net-zero road, marine and aviation drop-in fuels
Founded -Dublin, Spain$41Mlast round May 2026 - 5
Lunar OutpostLunar Outpost is a private aerospace company based in Golden, Colorado, focused on building robotic infrastructure to support a sustainable human presence on thLunar Outpost is a private aerospace company based in Golden, Colorado, focused on building robotic infrastructure to support a sustainable human presence on th
Founded 2017Golden, United States$30Mlast round May 2026 - 6
STELLARIAStellaria is an Emirati tech company founded in 2021 and based in Abu Dhabi.Stellaria is an Emirati tech company founded in 2021 and based in Abu Dhabi.
Founded 2023Abu Dhabi, France$27Mlast round Jul 2025 - 7
Karman+We want to mine space resources from near-Earth asteroids to provide abundant, sustainable energy and resources in space and for Earth.We want to mine space resources from near-Earth asteroids to provide abundant, sustainable energy and resources in space and for Earth.
Founded 2022Denver, United States$20Mlast round Feb 2025 - 8
Vaya SpaceVaya Space is a sustainable aviation and aerospace company producing rockets for low-reach orbit.Vaya Space is a sustainable aviation and aerospace company producing rockets for low-reach orbit.
Founded 2017Cocoa, United States$17Mlast round Jan 2023 - 9
Unum Aircraft SeatingUnum Aircraft Seating is a UK-based aerospace startup that designs, develops, and manufactures lightweight and sustainable business-class airline seats.Unum Aircraft Seating is a UK-based aerospace startup that designs, develops, and manufactures lightweight and sustainable business-class airline seats.
Founded 2020Crawley, United Kingdom$16Mlast round Apr 2026 - 10
Circularity FuelsCircularity Fuels converts biogas into sustainable aviation fuel.Circularity Fuels converts biogas into sustainable aviation fuel.
Founded -Palo Alto, United States$15Mlast round Nov 2026 - 11
InspeCityInspeCity, also known as InspeCity Space Laboratories Pvt.InspeCity, also known as InspeCity Space Laboratories Pvt.
Founded 2022Thane, India$14Mlast round Aug 2025 - 12
ARC AerosystemsARC Aerosystems is a UK-based aerospace startup founded in 2017, originally named Samad Aerospace.ARC Aerosystems is a UK-based aerospace startup founded in 2017, originally named Samad Aerospace.
Founded 2017Bedford, United Kingdom$12Mlast round Oct 2025 - 13
Kreios SpaceKreios Space is a Spanish deep-tech startup founded in 2021, specializing in Air-Breathing Electric Propulsion (ABEP) systems.Kreios Space is a Spanish deep-tech startup founded in 2021, specializing in Air-Breathing Electric Propulsion (ABEP) systems.
Founded 2021Vigo, Spain$9.5Mlast round Sept 2025 - 14
Firefly Green FuelsFirefly Green Fuels is a British developer focused on sustainable aviation fuel (SAF).Firefly Green Fuels is a British developer focused on sustainable aviation fuel (SAF).
Founded 2022Bristol, United Kingdom$6.2Mlast round Nov 2023 - 15
Azure Sustainable FuelsAzure Sustainable Fuels is a fuel company that offers low carbon, sustainable aviation fuel (SAF) production facility.Azure Sustainable Fuels is a fuel company that offers low carbon, sustainable aviation fuel (SAF) production facility.
Founded -Calgary, Canada$3.7Mlast round Mar 2024 - 16
Spark e-FuelsSpark e-Fuels is a Berlin-based climate-tech startup founded in 2021.Spark e-Fuels is a Berlin-based climate-tech startup founded in 2021.
Founded 2021Berlin, Germany$2.4Mlast round Jan 2025 - 17
MetafuelsMetafuels is a Swiss climate technology company founded in 2019, focused on developing sustainable aviation fuel (SAF) technology known as aerobrew.Metafuels is a Swiss climate technology company founded in 2019, focused on developing sustainable aviation fuel (SAF) technology known as aerobrew.
Founded 2021Zurich, Switzerland$2.2Mlast round Apr 2026 - 18
FlyOROHello there, we are FlyORO - your solution to last-mile Sustainable Aviation Fuels (SAF) blending technologies.Hello there, we are FlyORO - your solution to last-mile Sustainable Aviation Fuels (SAF) blending technologies.
Founded 2021Singapore, Singapore$1.6Mlast round Jan 2024 - 19
ATOBA EnergyATOBA Energy is a private company founded in 2024, focused on sustainable aviation fuel (SAF) aggregation and financing.ATOBA Energy is a private company founded in 2024, focused on sustainable aviation fuel (SAF) aggregation and financing.
Founded 2024Lyon, France$1.4Mlast round Jan 2025 - 20
AvioxxAvioxx is a clean-tech company based in the UK, founded in May 2023.Avioxx is a clean-tech company based in the UK, founded in May 2023.
Founded 2023London, United Kingdom$1.3Mlast round Feb 2024 - 21
WeSkyWeSky is an aviation technology company based in Vilnius, Lithuania.WeSky is an aviation technology company based in Vilnius, Lithuania.
Founded -Vilnius, Lithuania$1.2Mlast round May 2025 - 22
XCF GlobalXCF Global is a clean energy company that develops sustainable aviation fuel (SAF) production facilities.XCF Global is a clean energy company that develops sustainable aviation fuel (SAF) production facilities.
Founded -Houston, United States$700Klast round Jan 2026 - 23
ThermolicThermolic turns agricultural waste into two premium industrial products: renewable syngas and Thermolic Carbon.Thermolic turns agricultural waste into two premium industrial products: renewable syngas and Thermolic Carbon.
Founded 2021Denver, United States$500Klast round Sept 2026 - 24
Urban-Air PortUrban-Air Port, founded in 2019 and based in London, is a leader in the Advanced Air Mobility (AAM) sector.Urban-Air Port, founded in 2019 and based in London, is a leader in the Advanced Air Mobility (AAM) sector.
Founded 2019London, United Kingdom$308Klast round Mar 2026 - 25
Flux AviationFlux Aviation develops and manufactures sustainable powertrains for general aviation operations.Flux Aviation develops and manufactures sustainable powertrains for general aviation operations.
Founded 2021Warwick, United Kingdom$307Klast round Mar 2023 - 26
Dimensional EnergyDimensional Energy is a leader in carbon-to-value technology, focusing on transforming carbon dioxide emissions into sustainable aviation fuel (SAF), renewable Dimensional Energy is a leader in carbon-to-value technology, focusing on transforming carbon dioxide emissions into sustainable aviation fuel (SAF), renewable
Founded 2016Ithaca, United States$75Klast round Apr 2025
Torrance, Sweden
Abingdon, United Kingdom
Chicago, United States
Dublin, Spain
Abu Dhabi, France
Thane, India
Calgary, Canada
Berlin, Germany
Zurich, Switzerland
Singapore, Singapore
Vilnius, LithuaniaCompanies whose own description names this theme, ranked by the total they have raised in rounds we hold. Nobody pays to be on a list.
Who backed them?
Open any company for its rounds and investors, or search the investors who back sustainable aviation startups worldwide in the app, with filters, lists and exports.
More lists worldwide
See all
GV
V
RPHealth startups worldwide12,811 companies · $81B
O
A
XAI startups worldwide10,238 companies · $830BGVVRPBiotech startups worldwide7,127 companies · $70B
D
B
FTBig data startups worldwide3,812 companies · $220BAF
R
SFintech startups worldwide3,200 companies · $94BOABAI startups that raised in 20262,922 companies · $540B in 2026FT
CE
PEnergy providers startups worldwide2,808 companies · $152B
A
P
OMarketing tech startups worldwide2,728 companies · $28B