This depends on your airline. Flights can depart internationally from any of the terminals. They can only arrive in the international terminal. So check with the airline to see where that international flight will depart from. Worse case you could be moving from Terminal 1 to International Terminal 5, which you should allow 30 mins to move from one to the other on the tram.
Don't forget to figure in that regularly flights will be moved from one gate to another to accommodate the ever changing schedules and needs of the airport. Watch the boards like a hawk or you might show up to the gate that was right 20 minutes ago but is not the right one now.
Thanks! Your answer is awaiting moderation.