Figures from UK research consultancy Drewry said aggregate on-time performance came in at around 64% last month.
The latest result represents an 8.5% gain over February and is the second best average after October 2014 since the start of the new data series in May 2014.
The improvement seen in March is said to have been the consequence of much improved services in the Asia-Europe trade and gradually easing congestion on the US West Coast following the resolution of the port labour dispute.
