The figure was up 6% or 229,500 travellers compared to July 2013, and was led by European traffic, particularly on business routes which was up by 10.5%.
The world’s busiest single runway gateway also says it was fuelled by a North Atlantic traffic rise of 6.6% and particularly Norwegian Air Shuttle's new low-cost long-haul US routes.
Other long haul routes also saw growth of 8.9%, and London Gatwick explains it continues to attract traffic to both emerging and high growth markets – with Dubai seeing an increase of 6.7%.
Nick Dunn, the airport's chief financial officer, comments: “The strength of Norwegian’s new low-cost long haul flights on new-generation aircraft is really encouraging.
“What passengers want is the convenience of flying from their local airport to the destination of their choice with fares they can afford.
“Building a third runway at Heathrow will diminish the choice available to British passengers, making it more expensive to go on holiday, to travel for business and to export goods and services.
“We support competition, reduced fares and two world-class London airports serving the UK as a whole.”