How many times is Elijah mentioned in the New Testament?

Answer 1

One of the foremost prophets of Israel. He started his long career as prophet in Israel during the reign of King Ahab, who began to rule about 940 B.C.E., and continued during the reign of Ahab’s son Ahaziah (began c. 919 B.C.E.). (1Kings 22:51) The last time he is mentioned as serving as a prophet (this time for Judah) is toward the end of the eight-year reign of King Jehoram of Judah, which rule started in 913 B.C.E.​—2 Chronicles 21:12-15; 2 Kings 8:16. Elijah first appears in the record when he is sent by Jehovah God to announce chastisement upon Israel for their sins. His first reported words are: “As Jehovah the God of Israel before whom I do stand is living.” Elijah points out that Jehovah the living God of Israel has decreed that no rain or dew will occur for a period of years, except at Elijah’s word. This time period proves to be three years and six months. (1Kings 17:1; James 5:17)

(New World Translation of the Holy Scriptures)

Answer 2

Elijah is mentioned in the New Testament several times, specifically in the Gospels. He appears in passages such as Matthew 11:14, where Jesus identifies John the Baptist as the "Elijah" to come, and in the Transfiguration accounts (Matthew 17:1-3, Mark 9:2-4, Luke 9:28-36), where Elijah appears alongside Moses. Overall, Elijah is referenced around a dozen times in various contexts throughout the New Testament.