Due to the second national lockdown, foreign holidays are currently banned.
However, Heathrow Airport remains open. This is because overseas travel is still allowed, but only for essential work purposes.
The new restrictions mean the airport is still affected significantly, and is no way near as busy as what it usually is at this time of the year. While there has been a massive reduction in flights, some airlines are still flying from the airport, albeit not as much.
Another reason for the airport remaining open is so it can continue to provide access for vital cargo supplies into the UK.
A mass coronavirus outbreak could potentially lead to a temporary closure, but the government is highly unlikely to close the airport during the next four weeks.