This was the biggest grossing of all Elvis Presley's movies, eclipsing his previous all-time top hit, Blue Hawaii (1961), by about $450,000.
No soundtrack album was released from the movie at the time the film was in theatres. No official reason for this has been given.
Surprisingly, according to Variety, "Viva Las Vegas" earned more in distributors rentals than A Hard Day's Night (1964) despite both films being released in 1964 at the height of Beatlemania. "Viva Las Vegas" grossed $9,442,967 compared to $6,165,000 for The Beatles' debut feature.
Elvis Presley and Ann-Margret started dating during pre-production and, according to Ann-Margret, dated for one year.