London Gatwick Airport has served nearly 21 million passengers during the first six months of 2013, up 4.4% compared with nearly 20 million in the same period last year.
The growth was driven by a mix of legacy, charter and low cost carriers.
The underlying traffic growth was around 3.5% if 2012 Olympics traffic is taken into account.
The airport witnessed a significant increase from European short haul flights, especially from Norway, which launched 12 new routes, as well as growing business services from easyJet and Turkish Airlines.
Gatwick has launched a £1bn investment initiative, which will include a £45m renovation of the South Terminal’s retail offering which has contributed to a 2% increase in income per passenger to £3.55.
London Gatwick CEO Stewart Wingate said: "Our results today show a strong financial performance but we must not become complacent. We must continue to invest and ensure we remain competitive.
"Gatwick continues to attract new airlines and routes, which were once only the domain of Heathrow. We now serve routes as diverse and strategically important as Moscow, Beijing, Istanbul and key cities in Vietnam."
"Substantial growth continues to come from our extensive European network. Next year we will contine to grow our long haul network with routes including Jakarta, New York and Los Angeles."
Gatwick Airport reported a 10.7% rise in turnover to £360.6m for the six months ended 30 September 2013, while EBITDA was up by 14.4% to £196.7m and profit before tax was £127.3m.