In 1842, Ronconi appeared for the first time in London, at Her Majesty's Theatre, performing the part of Henry Ashton in Donizetti's "Lucia di Lammermoor". Ronconi's success with audiences outside Italy was immediate, and he continued to be one of the most popular and influential operatic artists in Europe until the early 1870s, when he retired. For instance, from 1847 and until 1866, he appeared at London's Theatre Royal, Covent Garden, in the second and third of the three theatres on that site (now known as the Royal Opera House.) Vienna heard him in 1843 and he sang in St Petersburg between 1850 and 1860 and New York City from 1866 to 1872.