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.
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95% of arriving passengers should be processed within 45 minutes - but as said above, there are so many variables...
Heathrow's rush hours are 7am to 10am and 5pm to 8pm on weekdays, with particularly dense traffic on Friday evenings and the first day of any school holiday.
In the main departures lounge you will find lots of shops, restaurants and facilities. You will also find all of the A Departure Gates. The two smaller Terminal 5 buildings (B Gates and C Gates) are much quieter than the main building.
London's Heathrow Airport has launched a six-month trial—aptly called “Heathrow Timeslot”—where travelers can pre-book a security slot, meaning that you may be able to avoid facing any lines whatsoever at security and effortlessly zoom straight through to the lounge.
It is never quiet in any meaningful sense. It runs at 98% capacity most of the time with flights landing & taking off every 30 seconds. Quiet & Heathrow don't really go together. Brittraveller: As far as I'm aware Sunday is almost always the busiest day of the week at Heathrow, particularly in summer.
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.
Allow between 30 minutes and 2 hours. Immigration queueing times have increased this week (some groups have been taking nearly two hours to reach arrivals from touchdown) but it's still very inconsistent so Peter's comment above is valid.
Terminal 5 at London Heathrow is the busiest airport terminal in the UK, with over 32 million passengers each year – more than Edinburgh Airport and Birmingham Airport combined.
Night flight restrictionsThere are two time periods: 23:00 - 07:00 and 23:30 - 06:00 both with restrictions on certain types of aircraft; The more restrictive period (23:30 - 06:00) is known as the Night Quota Period (NQP) and has limits on the number of movements which are set by the DfT.
You cannot stay airside at Heathrow Airport overnight. You can however remain in the public areas and try and sleep (I wouldn't, as I would worry about my belongings getting stolen). There are no sleeping couches, just ordinary seating. If you are worried about visa requirements though, you may be exempt.
A lot of airports have restrictions on night flights because of noise issues. Also some smaller domestic airports close at night. There are a few that leave late at night in order to take advantage of the time difference in the arrival city. There aren't more because there isn't much demand for them.
Also, since early-morning flights aren't as popular, there are fewer of them. This means the national airspace isn't as congested as it usually is later in the day, minimizing the risk of air-traffic-related delays. In my case, traveling in the morning was the only way I could pull off a same-day trip.
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.
Everyone who boards an aircraft at Heathrow has to be security screened to UK government standards. Even if you've already been through security checks at another airport, we're obliged to screen you again before you fly from Heathrow.
As with so many things in travel, there's a simple answer — and a complicated one. The simple answer is: Two hours for domestic flights, three hours for international flights. More or less.