Vessel schedule reliability is the measure of how often container ships arrive when their published schedules said they would, usually the percentage of arrivals within a tolerance, commonly one calendar day, of the scheduled date. It is tracked per carrier, trade lane, and month by industry analysts.
Reliability is the honest summary of a network’s health: it absorbs weather, congestion, blanked sailings, and recovery discipline into one number. It swings materially through market cycles, collapsing during systemic disruptions and recovering when capacity loosens.
For planning, average reliability matters less than your lane’s distribution: a service that is either on time or five days late needs different buffers than one that is uniformly a day late. Contract commitments rarely guarantee schedule; buffers and monitoring do the real work.
Published indices describe the market; your own tracked history describes your risk. Following estimated versus actual arrivals across your shipments in TrackingMCP builds the lane-level picture that matters for promises and safety stock, and carrier data health shows how dependable each line’s reporting itself is.
Vessel schedule reliability is the measure of how often container ships arrive when their published schedules said they would, usually the percentage of arrivals within a tolerance, commonly one calendar day, of the scheduled date. It is tracked per carrier, trade lane, and month by industry analysts.
The common convention in industry indices is arrival within one calendar day of the scheduled date, measured per port call. Stricter or looser tolerances change the headline number substantially.
Not by itself. Reliability reflects shared conditions like port congestion as much as carrier discipline, and lanes differ. Compare carriers on the same trade and period, not global averages.
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More in Vessels, voyages & schedules: Blank sailing · Port omission · Transshipment · Feeder vessel · Voyage number · ETA, ETD, ATA & ATD · Slow steaming · AIS (Automatic Identification System) · Draft (draught) · Carrier alliances · Vessel sharing agreement (VSA) · Browse all 106 terms →