[23] He performed small roles in a new production of George Benjamin’s Written on Skin with Opera Philadelphia,[24] and also in Rossini's Mosè in Egitto at the Teatro San Carlo di Napoli conducted by Stefano Montanari.

[42][43] Season 2019-20 saw Kent perform in Il barbiere di Siviglia for Theater Basel[44][45][46] with David Parry conducting Kirill Serebrennikov’s production from the Komische Oper Berlin.

[59][60][61] He also performed Stravinsky’s Pulcinella with the Orchestra Sinfonica Nazionale della RAI conducted by Ottavio Dantone,[62][63] and L'italiana in Algeri in a new production by Ido Ricklin for the Israeli Opera.

[65] Kent began debuting in major theatres in leading roles in 2021-22, with performances of Il barbiere di Siviglia with both the Bayerische Staatsoper[66] and The Dallas Opera.

The length of breath, the articulation, the charm and the panache.."[82] In 2022-23, he returned to the Bayerische Staatsoper to make a role debut as Belmonte in Die Entführung aus dem Serail,[83] and for performances of La Cenerentola in a cast including Florian Sempey and Erwin Schrott,[84] in Jean-Pierre Ponnelle's historic production which premiered at Teatro alla Scala in 1973.

[97] Major debuts continued in 2023–24 with performances as the title role in Haydn’s Orlando paladino at the Teatro Real Madrid[98] and the Gran Teatre del Liceu,[99] with Giovanni Antonini conducting Il Giardino Armonico and a cast that included Emőke Baráth.

He debuted as Narciso in Il turco in Italia for Opernhaus Zürich,[100] where he also appeared as Thespis in a new production of Rameau’s Platée with Emmanuelle Haïm conducting La Scintilla.

[103] He made his house debut with Theater an der Wien in the world premiere of Salieri's Cublai, gran kan de’ Tartari in the original Italian-text, with Christophe Rousset conducting Les Talens Lyriques.

[103] Other performances included a house debut with the Deutsche Oper am Rhein in La Cenerentola,[105] where he was critically praised for "his effortlessly radiant tones,"[106] and his "ease above the staff," and "beautiful messa di voce.."[107] In concert, he appeared with the Orchestre national de Lille[108] and with the Stavanger Symfoniorkester in George Benjamin's Written on Skin.

[109] Kent's 2024–25 season started with performances of Il barbiere di Siviglia with the Opéra de Montréal,[110] where one critic called him, "the major vocal discovery of the evening in Almaviva.

This is a real tenore di grazia, with a distinguished tone and great finesse in the execution," and calling the performances "a production which is worth seeing, especially for the remarkable Count Almaviva by Alasdair Kent.

"[111] The tenor is scheduled to make a house debut in concert with the Teatro alla Scala in Milan as Marzio in Mozart’s Mitridate, re di Ponto, with Christophe Rousset conducting Les Talens Lyriques[112] and further performances at the Théâtre des Champs-Élysées.

[117] He also debuts as Pylade in Gluck’s Iphigénie en Tauride with the Teatro de la Maestranza in Seville,[118] as Valère, Don Carlos, Tacmas & Damon in Rameau's Les Indes galantes for The Grange Festival with Leonardo García Alarcón and the Cappella Mediterranea,[119] and Toante in Tommaso Traetta's Ifigenia in Tauride with Christophe Rousset and Les Talens Lyriques with the Innsbrucker Festwochen der Alten Musik.