Visitors from Britain fell from 6833 to 5527 and the 12-month rolling total dropped 1.7 per cent from 189,557 to 186,283.
Auckland Airport's figures for May show total international passenger volumes, excluding transits, fell 2.9 per cent to 500,064 from a year earlier.
Chinese arrivals jumped 44.4 per cent to 12,443.
China was New Zealand's second-largest inbound market behind Australia for the third month in a row with almost 4500 more arrivals than the third-placed United States.
There was strong domestic growth across the whole group, with 25 per cent-owned Queenstown Airport rising 13.6 per cent to 59,567.
Auckland Airport has stakes in Queensland's Cairns and Mackay airports.
Cairns reported a 5.4 per cent increase to 259,245 domestic passengers.
Mackay climbed 18.9 per cent to 96,164.