From the UK (Gatwick or Heathrow) to Puerto Vallarta

Jenny , Susana, Judilee ,Reilley and Boca all offer very good advice. All I can add is I am sure your vacation is available through some British tour operator. In Oct/Nov 2004 there were several Brit couples staying at our resort ( The Premiere) . I forget the actual point of departure but connections were made through Mexico City. They all were on 21 day trips. Good luck in your search the results will be worth all your effort.