Heathrow said this morning that 5.18m passengers passed through the airport in January, a record for the month.
It marks an increase of 0.3 per cent on January 2012, up despite disruption from snow.
The load factor – which shows how full the typical flight was – also set a record for the month at 70 per cent, up two per cent year on year.
Regionally, domestic travel was down 5.8 per cent while traffic to Europe rose 1.8 per cent. Passengers to the US and Middle East rose 2.2 per cent and 3.3 per cent respectively.