The upturn in passengers marks the 29th consecutive month of growth for the airport and means that 17.9 million travellers (+1.4%) passed through its facilities in the first three months of 2019.
According to the airport, Africa performed especially well over the past month, increasing by 6.2% compared to the same time last year.
Domestic connections also saw a slight uplift (+0.2%) with British Airways launching its second service to Inverness and Flybe growing their loads by more than a fifth (23%) with an inaugural flight to Cornwall on March 31.
More than 149,000 metric tonnes of cargo travelled through the UK’s biggest port by value, further demonstrating the importance of Heathrow in a post Brexit world.
Both Latin America and Africa saw remarkable double digit growth with the former up 23% on 2018 due to additional services to Brazil and increased volumes to Mexico. Freight to and from Africa grew by 11%, thanks to Virgin’s growth on routes to the continent.
Heathrow CEO, John Holland-Kaye, said: “Despite Brexit uncertainty, Heathrow remains a bright light for the UK, with the role we play in keeping people and products moving evident.
"Our new domestic connections will be pivotal in linking more regions and nations to global opportunities, benefiting all corners of this great country and we look forward to announcing many more of these as part of the expansion programme.”