Ronaldo stepped up to take the penalty and the 39-year-old sent the goalkeeper the wrong way to score his sixth goal of the league campaign in the seventh minute of stoppage time.
Cristiano Ronaldo insists he is focused on being the perfect team member at Saudi side Al Nassr rather than collecting more individual accolades in the twilight of his career.
His Portuguese predecessor Castro was the third coach to depart Al Nassr since Ronaldo's groundbreaking arrival in early 2023.
The futures of Napoli striker Victor Osimhen and England international Ivan Toney are set to dominate the final day of the European transfer window on Friday as Chelsea continue their frenzied pursuit of new signings.
Ronaldo's latest goal places him just two goals shy of achieving 900 career goals.
The Belgium captain has six Premier League crowns and one Champions League title, as well as two FA Cups and five League Cups to his name since his 2015 switch from German side VfL Wolfsburg.
Neymar is set to miss the start of the next Saudi Pro League season as he recovers from a serious knee injury, Al Hilal's coach said Tuesday.
Ronaldo was once again the star performer for his side and was as clinical as ever in front of the goal. The 39-year-old was too hot to handle for the Al-Wehda players who completed the 66th hat-trick of his illustrious career.
The 39-year-old scored back-to-back hattricks in three days.
Al-Hilal have signed Morocco goalkeeper Yassine Bounou from Spanish side Sevilla on a three-year contract, the Saudi Pro League club said on Thursday.
The 31-year-old Neymar signed a two-year contract with the Riyadh-based club on Tuesday after spending six years with Paris St Germain, in a deal reportedly worth about 90 million euros ($98 million)
Cristiano Ronaldo's arrival in January to play for Riyadh-based Al-Nassr is what first drew global attention to ongoing efforts to boost the Saudi Pro League.
Saudi Professional League (SPL) club Al-Hilal announced that Neymar had signed a contract until 2025, with the Brazilian saying, "I am here in Saudi Arabia, I am Hilali" in a video on the team's social media accounts
The Brazil international joined the French champions for 220 million euros ($241m) from Barcelona in 2017
Cristiano Ronaldo slotted home from the spot in the final minutes to propel his Saudi Pro League side Al Nassr to their first-ever Arab Club Champions Cup final after a 1-0 win over Al Shorta in the semifinal at the Prince Sultan bin Abdul Aziz Stadium in Abha on Wednesday.
Liverpool manager Jurgen Klopp on Tuesday urged football authorities to address the late closure of the transfer window in the Saudi Arabia league, fearing it may have a detrimental effect on European clubs.
Bayern Munich boss Thomas Tuchel said Tuesday he was saddened that things didn't work out for Sadio Mane at the club but feels his departure is for the best.
Manchester City manager Pep Guardiola said on Saturday that the Saudi Pro League had "completely changed the market" and he expects more and more high-profile players to move there.
Cristiano Ronaldo was replaced at half-time as Al Nassr drew 1-1 with Champions League finalists Inter Milan in the second game of their pre-season tour in Japan on Thursday.