Global shipping schedule reliability held steady in August and showed marked improvement from a year earlier, according to a new report from Sea-Intelligence. However, the rate of late arrivals worsened during the month.

The Danish maritime data analysis company reported that in August, global industry schedule reliability recorded a marginal month-on-month (M/M) improvement of 0.1 percentage points to 65.3%, the second-highest figure for the month (across 2019-2025).

On a year-on-year (Y/Y) level, schedule reliability in August 2025 was up 12.7 percentage points.

Sea-Intelligence, noted, however, that the average delay for late vessel arrivals increased M/M by 0.07 days to 4.80 days.

For August, the report named Maersk as the most reliable top-13 carrier with schedule reliability of 76.4%, followed by Hapag-Lloyd with 72.4%. The next six carriers were in the 60%-70% range, with the remaining carriers in the 50%-60% range.

For the period, Sea-Intelligence reported that Wan Hai had the lowest reliability of 53.3%.

Sea-Intelligence said alliance scores have traditionally focused on arrivals in destination regions. However, that metric was unavailable for the new alliances in February, prompting the introduction of a broader measure that includes all arrivals—covering both origin and destination region calls on East/West trades.

Both metrics continue to be presented: "All arrivals," which aligns with the February methodology, and "Trade arrivals," which reflects the approach used for previous alliances.

It added that once the new alliances are fully rolled out, these two measures will converge.

In July/August 2025, Gemini Cooperation recorded 89.9% schedule reliability across ALL arrivals, and 86.9% across TRADE arrivals, followed by MSC at 79.0% for ALL arrivals and 80.2% for TRADE arrivals, while Premier Alliance recorded 55.4% for ALL arrivals and 56.0% across TRADE Arrivals.

Sea-Intelligence added that for the "old" alliances, "ALL arrivals" are equal to "TRADE arrivals", and Ocean Alliance scored 66.9%.

Global schedule reliability in July 2025 was 65.2%, marking a 2.2 percentage point decline from June—the first month-on-month drop since January.

In June, schedule reliability reached 67.4%, the highest figure recorded since November 2023. In May 2025, schedule reliability was up 7.4 percentage points M/M reaching 65.8%.