By geography, the Americas posted the biggest fall, with its first half pre-tax profit declining by 32.1% to US$8.14m ($13.3m).
New Zealand followed with a 24.1% fall to $46.38m, while pre-tax earnings from Asia were down 9.6% at US$5.93m.
Australia was the standout - with before-tax earnings gaining 7.6% to A$60.8m ($67m), although margins in its air and ocean business were under pressure.
Mainfreight’s operation in Europe posted a 5.5% gain to €13.23m ($23.7m).
In May, Mainfreight posted a 33% fall in profit before tax to $395.4 million for the year to March 2024 as freight volumes and international sea and air freight rates returned to earth.
Shares in Mainfreight last traded at $70.40, having gained 12% over the past 12 months.