Global Container Shipping On-Time Performance Dips to 39%

Global container shipping schedule reliability retreated in May despite three consecutive months of improvement, with on-time carrier performance slipping to 39% according to Xeneta's Global Reliability Scorecard. 4 days—the lowest since July 2025—the momentum gained from March through April has stalled, signaling renewed operational challenges across the shipping industry. This reversal reflects ongoing port congestion pressures that continue to undermine carrier commitments and force shippers to manage extended lead times and buffer inventories.

The data reveals a fragile recovery in container shipping reliability. Progress from 36% on-time performance in March to 37% in April suggested operational normalization, yet the pullback to 39% in May indicates structural port bottlenecks remain unresolved. For supply chain professionals managing global procurement and demand planning, this inconsistency reinforces the need for conservative schedule assumptions and contingency buffers when committing to container shipments.

4-day average delay, while improved from recent highs, still represents a material compression of delivery windows that can cascade disruptions through downstream warehousing and last-mile networks. This slowdown underscores a critical supply chain reality: vessel capacity and carrier scheduling reliability remain hostage to port infrastructure constraints. Until terminal congestion eases systematically across major global ports, shippers should expect volatility in performance metrics and maintain risk mitigation strategies including dual-sourcing, safety stock policies, and real-time tracking protocols to absorb continued variability.