Poor new year liner schedule reliability only improves as summer arrives

Global schedule reliability has become more seasonal, while weekly liner service deployments have grown increasingly volatile since the pandemic, according to new analysis by Sea-Intelligence.

Drawing on its Global Liner Performance database, which tracks monthly vessel arrivals from July 2011 to September 2026, the consultant found a stronger relationship between declining punctuality and the severity of delays, at , alongside more pronounced seasonal fluctuations in reliability.

While declining reliability has historically been associated with longer delays, the correlation between the two measures has shifted to a lower sustained level since the pandemic, indicating a tighter relationship between whether vessels arrive late and the magnitude of their delays than was evident before.

Sea-Intelligence also identified a marked change in the seasonal pattern of global schedule reliability.

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