Many fans would have arrived at Eastbourne hoping for Konta and Watson to set up an all-British final.
Konta is scheduled to play on Monday at Wimbledon against Chinese Taipei's Hsieh Su-wei, who beat her at the French Open last month, in the first-round draw.
Ahead of her return to SW19, two-time Wimbledon champion Petra Kvitova has said it is only the beginning of her "second career" after recovering from injuries to her playing hand sustained during a knife attack in her home last December.
"It's been great to get the feel, because especially on the grass, if you don't feel 100 percent comfortable, it can be pretty tricky", said Wozniacki, who won her lone grasscourt title eight years ago at Eastbourne.
The 26-year-old from Denmark could not understand what was going on and would have felt like it was daylight robbery with the second seed taking the opening set by producing a crushing backhand victor down the line, 7-5 in 44 minutes.
Halep, who is seeded second for Wimbledon behind Kerber struggled in the first set but calmed down in the second.
Fellow Briton Heather Watson joined Konta in the tournament's last four after overpowering world No20 Barbora Strycova 6-1, 1-6, 6-4, having earlier defeated Anastasia Pavlyuchenkova 6-4, 6-3. In the second, he saved three break points, and broke Monfils to cap the final and improve to 14-0 against the Frenchman on the tour. Continuing to go after her serve, Wozniacki stamped a love hold for a 3-2 second-set lead.
"Hopefully I can go far at Wimbledon", Pliskova 25-year-old told BBC Sport. "I think the serve is definitely my biggest weapon and if it's working then it's trouble for the opponent".
"It could have gone both ways, honestly", Wozniacki said.