Container shipping schedule reliability is stuck at 51-67%, meaning shippers cannot plan their supply chains around vessel arrival dates

In 2025, global container shipping schedule reliability averaged 61.5% — meaning nearly 4 out of every 10 vessels arrived late. January reliability hit just 51.4%, and even the best month (June) only reached 67.4%. The average delay for late vessel arrivals was 1.58 days, which sounds modest until you understand that this is an average across all arrivals, including on-time ones. For the vessels that actually arrive late, delays of 3 to 7 days are common. Pre-pandemic, the industry maintained 70-80% reliability with sub-1.2-day average delays. That baseline has not returned and shows no signs of returning. A shipper cannot run a just-in-time supply chain on a transportation mode that is late 40% of the time. The practical consequence is that importers must hold larger safety stock — typically 2 to 4 extra weeks of inventory — to buffer against vessel delays. For a mid-size retailer importing $50 million in goods annually, that extra safety stock ties up $2 to $4 million in working capital that could otherwise be invested in growth. Warehouse costs increase because the buffer stock needs somewhere to sit. Production planners at manufacturing companies cannot schedule assembly runs until they confirm components have actually arrived, creating idle time on factory floors. The structural cause is that carriers deliberately slow-steam vessels (reduce speed to save fuel) and insert buffer days into published schedules to improve their on-paper reliability statistics without actually improving service. The Red Sea crisis rerouting via the Cape of Good Hope added 10-14 days to Asia-Europe voyages, and carriers have been slow to restore direct Suez routing even as security conditions improve, because the longer routes absorb excess vessel capacity and support higher rates. Carriers also compound the reliability problem by concentrating port calls into mega-vessel services that create berth congestion — a single 24,000-TEU vessel takes 3-4 days to unload, blocking berths for other vessels and creating cascading delays across entire port complexes.