Which Container Trade Lanes Are Now the Hardest to Plan Around?

Global schedule reliability fell to 62.6% in June 2026, down 1.9 percentage points on the month and 4.7 points on the year. That was still the second-highest monthly figure of 2026, which shows how little an industry-wide headline can tell you about the lane or service your cargo actually uses.

A second release three days later carried a measure that helps identify where that average is least dependable. Sea-Intelligence measured schedule-reliability volatility across trade lanes over 24 months and found that nine of the ten most unstable lanes were not in that bottom tier before the pandemic.

Why an Average Cannot Size a Buffer

Sea-Intelligence frames the problem with a comparison worth borrowing. A lane that swings sharply between strong and weak reliability from one month to the next is harder to plan around than one that holds near the same level, even when their longer-term averages look similar.

The measure used is standard deviation expressed as a share of average reliability. It answers a question the average cannot: how widely has this lane’s monthly reliability moved around its normal level?

That makes the measure useful for identifying lanes that need closer buffer analysis. It does not translate directly into a number of buffer days. For that, a planner needs the distribution of actual arrival delays by lane, service and season.

One more June figure matters when assessing delay exposure. The average delay for vessels classified as late improved by 0.34 days to 5.31 days, though it remained 0.78 days above June 2025. Overall schedule reliability was 62.6%, meaning 37.4% of measured arrivals fell outside Sea-Intelligence’s on-time window. The two figures describe different parts of the distribution and should not be combined into a single buffer assumption.

The Volatility Map Has Been Redrawn

Trade lane	Variability over 24 months	In the pre-pandemic bottom tier
Asia to East Coast South America	Above 33%	No
Asia to North America East Coast	Above 25%	No
South America to North America	Above 25%	No
Transatlantic Westbound	19.76%	Yes
Europe to Africa	24.19%	No
Africa to Europe	20.05%	No
Middle East to Europe	19.41%	No

Selected lanes from Sea-Intelligence Sunday Spotlight 775, published 30 July 2026. Variability is standard deviation as a share of average schedule reliability over the trailing 24 months. The complete ten-lane ranking and exact figures are available in the public data file accompanying the release.

Asia to East Coast South America is the outlier, with variability above 33% and no other deep-sea lane close to it.

Europe to Africa, Africa to Europe and Middle East to Europe have all moved into the most volatile group, and none of them were there before 2020. Historical experience may still lead some teams to treat these lanes as relatively routine, even though their recent month-to-month performance no longer supports that assumption.

The other half of the finding is what did not change. Variability among the ten most stable trades improved slightly, from 6.4% before the pandemic to 6.1% now. The most stable group became marginally more consistent while the composition of the most volatile group changed sharply, widening the difference hidden inside the global average.

East–West Network Performance Now Spans Nearly 40 Percentage Points

Alliance or standalone network	Schedule reliability, May–June 2026
Gemini Cooperation	93.4%
MSC	80.7%
Ocean Alliance	67.6%
Premier Alliance	53.6%

Sea-Intelligence Global Liner Performance report, issue 179, published 27 July 2026.

The gap between Gemini Cooperation and Premier Alliance was 39.8 percentage points in the May–June measurement window. That spread shows how much network choice can matter on the East–West trades covered by the alliance comparison. It does not mean alliance structure outweighs every market or lane-level condition, but it makes an industry-wide average a weak substitute for service-level performance.

At carrier level in June, Maersk led the top 13 at 77.1%, Hapag-Lloyd followed at 75.6% and MSC at 72.1%. Those were the only three above 70%. CMA CGM was alone in the 60% to 70% band, eight of the remaining nine carriers sat between 50% and 60%, and Wan Hai was last at 35.6%. Two carriers improved month on month, with ZIM posting the largest gain at 0.8 percentage points.

A booking made with one carrier does not always sail on that carrier’s own tonnage. Slot charters and vessel-sharing agreements mean the vessel operator can differ from the carrier named on the booking. Sea-Intelligence’s carrier-level scores already include the services each carrier offers through those arrangements, so neither the booking carrier’s global average nor the vessel operator’s global average describes an individual service precisely. Service- and lane-level arrival history is the more useful basis for setting operational buffers.

If you are sizing buffers from carrier averages because your own arrival history sits across five portals, walk through how ops teams measure planned against actual arrival per service in one view.

August Blank Sailings Are Concentrated on the Transpacific

Drewry’s cancelled sailings tracker counted 58 blank sailings across the major East–West trades for weeks 32 to 36, covering 3 August to 6 September, out of 723 planned departures. That is an 8% cancellation rate. It compares with a 5% cancellation rate in Drewry’s 17 July five-week outlook, although the two snapshots cover different sailing windows.

Transpacific eastbound accounts for 60% of the cancellations in the latest outlook, Asia to North Europe and the Mediterranean 26%, and the Transatlantic 14%. Sea-Intelligence identifies Asia to North America East Coast as one of the most volatile lanes, but Drewry’s public tracker does not split the Transpacific cancellations between East and West Coast services. The two releases therefore point to overlapping risk, not a confirmed concentration on the East Coast lane.

Withdrawn capacity may reach a shipper as a rolled, rerouted or rebooked container rather than as a market headline. We covered the mechanics of how those changes show up in tracking, and how a roll differs from a blank sailing, in our guide to why container tracking goes silent.

What to Check This Quarter

List your live lanes against the volatility table above. Treat it as a screening tool for where closer service-level analysis is needed, not as a direct buffer calculation.
Pull your last twelve months of actual arrival dates against original ETA per lane and calculate the spread and upper-end delay percentiles, not just the average.
Record the booking carrier, vessel operator and specific service used for each shipment. Global carrier averages do not describe the performance of an individual loop.
For Transpacific eastbound bookings in August, check carrier advisories and service-level blank-sailing notices more frequently; the announced cuts are concentrated on that broad trade.
Do not use the 5.31-day average as your buffer. It applies only to vessels classified as late and does not show the upper tail of the delay distribution.

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