Traveling through Heathrow Airport means planning ahead, especially when it comes to security. Mornings are usually the busiest, with long haul flights creating early queues. Heathrow Security Times Afternoons can also get crowded depending on departures. Arriving at least two to three hours before takeoff gives you breathing room. Keep liquids in a clear bag, have electronics ready for screening, and wear easy to remove shoes. Terminal traffic can vary, particularly in Terminal 5, which is largely used by British Airways. Staying organized makes the process smoother and far less stressful.