<i>As a general guide you should aim to arrive:
Long-haul and El Al: three hours before scheduled departure
European flights: two hours before scheduled departure
UK and Ireland flights: 90 minutes before scheduled departure.</i><p><a href="http:&#x2F;&#x2F;www.heathrow.com&#x2F;departures&#x2F;checking-in" rel="nofollow">http:&#x2F;&#x2F;www.heathrow.com&#x2F;departures&#x2F;checking-in</a>