Flight Arrivals are located on Level 1 while Flight Departures can be found on Level 5 (Check-in level) and Level 4 (Gates A1-A26).
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We recommend getting to the airport three hours before your flight if you're travelling internationally, or two hours if you're travelling domestically or to Europe.
Unsurprisingly, Heathrow Terminal 5 took the top spot. As the main hub for long-haul flights from British Airways, Iberia and American Airlines (just to name a few), T5 recorded over 100,000 passengers in September alone. Heathrow's Terminals 3 and 2 ranked similarly highly, coming in at fifth and sixth respectively.
All European carriers except Icelandair use terminal 2A to board and disembark passengers. Air Canada and Turkish Airlines also use this building for their short haul flights. 2B was designed by Grimshaw Architects, and built by Balfour Beatty.
The peak times at London Heathrow Airport is from 10 AM to 1 PM, and 5 PM to 8 PM. Since London Heathrow Airport is the busiest airport in the UK, you'll find it jam-packed with passengers 24/7.
In most cases, you will only need to go to check-in when you have checked-in online if you need to drop off an item of hold baggage. Please ensure that you are aware of the hand baggage requirements for your specific airline before you travel.
The General Guideline for How Early You Should Get to the Airport. Generally speaking, most airlines advise that you arrive at the airport at least 2 hours prior to a domestic flight, and at least 3 hours prior to an international flight.
Check-in closes 60 minutes before long-haul flights depart and 45 minutes before short-haul flights depart. Pass through security at least 35 minutes before your flight departs. Be at the boarding gate at least 20 minutes before your flight departs. See the 'Boarding' section, below.