The mobility offering - already available in Washington DC and Los Angeles as well as in France, Spain and Portugal - includes insurance, maintenance and delivery, into a month-to-month subscription, accessed via the Free2Move app.
The service is now is set to expand to the UK, Germany, Portland and Baltimore.
Stellantis said other launches are planned by the end of the year, both in Europe and the United States.
Elodie Picand, director of sales and marketing at Free2Move, said: “Since we initially launched Car On Demand two years ago, we’ve perfected this as a flexible, performant solution, created to answer the needs of our B2C customers.
“Our service is considered a true alternative to purchasing a vehicle, as it covers daily or punctual access.”
Online-only premium car brand Genesis recently announced the launch of its Genesis Flexibility car subscription service to customers across Europe.
Volvo’s car subscription service, Care by Volvo, has delivered 2,500 cars to customers in its first year, accounting for 15% of all its UK retail sales.
Hyundai Motor UK also launched a new Mocean all-inclusive vehicle subscription model offering motorists a fully taxed, insured and maintained car for a single monthly payment.
Earleir this year Stellantis reported an “outstanding” 9.5ppt year-on-year improvement in operating income margin, to 11.4%, in the first half of 2021.