Denver International Airport (DIA) has served 4.16 million passengers in April 2014, up 3.2% compared to 4.03 million passengers during the same period in the previous year.
The growth was driven by a mix of high-load factors and the Easter holiday falling in April.
DIA CEO Kim Day said: "In April, all three of our largest partners; United, Southwest and Frontier, showed an increase in connecting passengers.
"United's international traffic increased by 27%, Southwest's increased by nearly 47% and Frontier's increased by 21% compared with April 2013. We are on track for a very strong year at Denver International Airport with our peak summer season just around the corner."
The passenger traffic for international flights increased by 24% to 192,870 travellers in April, from 155,510 travellers in April 2013.
Mail, freight and express cargo operations at DIA saw an increase of 9.2% in April, compared with the same month last year.
During the first four months of this year, the airport handled 16.54 million passengers, up 2.1% compared to 16.20 million in the same period last year.
To date, DIA has handled around 162,477,217lbs of cargo this year, down 2.4% from 166,514,572lbs handled in the same period last year.
Image: Concourse B at Denver International Airport. Photo: courtesy of David Benbennick.