The world number eight Konta has not dropped a set this week, but was made to work hard to maintain that record by Magdalena Rybarikova.
The top seed in Nottingham ultimately triumphed 6-2 7-5, breaking her opponent late in set two to avoid a tie-breaker.
Donna Vekic will provide Konta’s opposition in Sunday’s final. Vekic battled past Lucie Safarova in a match lasting close to three hours, eventually winning 7-6 (7-5) 3-6 7-6 (7-4).
At the Rosmalen Grass Court Championships, Natalia Vikhlyantseva beat fifth seed Ana Konjuh 6-3 7-5 to reach her first WTA Tour final.
Anett Kontaveit stands between Vikhlyantseva and a maiden title, after the Estonian came through a three-setter with Lesia Tsurenko.