Liege Airport has handled 1m tonnes of cargo and marked the milestone as a "historic and symbolic day".
The milestone was reached when an Airbridge Cargo flight, chartered by Chinese company HongYuan, touched down at the airport.
Cargo on the flight — including the millionth tonne — was processed by WFS and Belgium Airport Services.
Liege Airport noted that since 1996, its strategy has been focused on full-cargo operations.
"In 1996, we had transported just under 8,000 tonnes," said Luc Partoune, chief executive of Liege Airport.
"The figure of 1m tonnes shows how far we have come since then with an almost equal distribution between import and export. This is the result of the work of our entire cargo community and I would like to thank and congratulate our staff and all our partners once again."