[7] On 30 March, Dart and her doubles partner Lesley Kerkhove won the final of the Open de Seine-et-Marne[8] against Sarah Beth Grey and Eden Silva.

At the Wimbledon Championships, Dart beat both Christina McHale[9] and Beatriz Haddad Maia,[10] progressing to the third round where she lost to Ashleigh Barty only winning two games.

[13] At Wimbledon, Dart reached her first Grand Slam final making the mixed doubles decider alongside partner Joe Salisbury where they lost to Neal Skupski and Desirae Krawczyk.

[14][15] Partnering Asia Muhammad, she won her first WTA 125 doubles title at the Midland Tennis Classic, defeating Peangtarn Plipuech and Aldila Sutjiadi in the final.

[33] In June, Dart reached successive WTA Tour quarterfinals, with runs to the last eight at the grass court events in Nottingham, where she lost to eventual champion Katie Boulter,[34] and Birmingham, when it was Anastasia Potapova who ended her challenge.

[37] Dart returned to the world's top 100, after reaching her first WTA singles semifinal at the Transylvania Open defeating Anna Bondár, fifth seed Elisabetta Cocciaretto, and Nuria Párrizas Díaz, before bowing out against eventual champion Karolína Plíšková.

[42] Alongside Diane Parry, Dart was runner-up in the doubles at the Nottingham Open, losing to top seeds Gabriela Dabrowski and Erin Routliffe in the final.

[44] Dart made it through to round three at Wimbledon with victories over Bai Zhuoxuan[45] and Katie Boulter,[46] but then lost six games in a row from 3-0 ahead in the deciding set against Wang Xinyu to bring her run in the tournament to an end.

[47] Dart retired due to cramp in her final qualifying match at the Canadian Open but was given a place in the main draw as a lucky loser only to be defeated in the first round by Diana Shnaider, in three sets.

[57] Wins over Lizette Cabrera[58] and Taylah Preston[59] saw Dart reach the final round of qualifying at the Australian Open, where she lost to Nao Hibino.

[63] Only main-draw results in WTA Tour, Grand Slam tournaments, Fed Cup/Billie Jean King Cup and Olympic Games are included in win–loss records.