The boarding gate is normally announced about 2 hours before the take-off time, so you will need to check the departures website if you are not already inside the airport by that time. In the airport you can check the LCD screens to see where's your boarding gate.

Your flight gate assignment typically becomes visible on airport monitors and mobile apps anywhere from 2 to 4 hours before your scheduled departure time. For domestic flights, it is often assigned and visible earlier, but for international flights, gates are frequently confirmed only after the aircraft has landed from its previous leg and a gate becomes physically available. Most airlines will also print a "preliminary" gate on your boarding pass if you check in online within 24 hours of the flight, but it is crucial to remember that gates are highly subject to change due to air traffic control or operational needs. Modern travelers should rely on the airline's official app or the large "Flight Information Display Systems" (FIDS) at the terminal for the most up-to-the-minute data. It is generally recommended to check the gate again immediately after passing through security, as last-minute changes are common in busy hubs like LAX or Heathrow.