Charlton scored four international hat-tricks; in addition to the one against the United States, he scored three goals in a game against Luxembourg during the 1962 FIFA World Cup qualifiers, and in friendlies against Mexico and Switzerland.
Charlton mencetak empat hat-trick internasional; selain satu melawan Amerika Serikat, ia mencetak tiga gol dalam sebuah pertandingan melawan Luksemburg pada kualifikasi Piala Dunia FIFA 1962, dan dalam pertandingan-pertandingan persahabatan melawan Meksiko dan Swiss.