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Heathrow International Airport is one of the busiest airports in the United Kingdom and the world. The traffic on M25 can sometimes be busy, especially around Heathrow. Normally you should arrive the airport at least 1 hour before the departure time for domestic flights, or 2 hours before the departure time for an international flight. During the weekend and holiday season, it is highly recommended to arrive an extra hour earlier than your scheduled flight.
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