I-539 Final-Stage Wait Hits 12-Week High as Outlier Flag Fires at z=2.29
The week of September 7 brought a 128-day median, up 7 days from last week and the highest reading in the 12-week window. SRC's steep, confirmed upward slope makes this more than a one-week fluctuation to dismiss.
The I-539 final-stage wait reached 128 days the week of September 7, a 7-day jump from last week's 121-day reading and the peak of the past 12 weeks (which ranged from 94 to 128 days). A statistical outlier flag fired at z=2.29, placing this week's median more than two standard deviations above the 8-week trend line. Year over year, the gap is modest: the same week in 2025 came in at 125 days (across 442 cases). But SRC, which handled 72% of this week's approvals, carries an upward slope of +7.0 days per week with R²=0.91, the strongest confirmed trend among any center this week. The aggregate number and the center-level trend point in the same direction.
- The I-539 final-stage median reached 128 days the week of September 7, the highest in the 12-week window (range: 94 to 128 days), triggering an outlier flag at z=2.29 against the 8-week trend line.
- SRC handled 2,751 of 3,820 approved cases (72%) this week and carries the only confirmed upward slope among centers: +7.0 days per week at R²=0.91.
- Cases that responded to an RFE (Request for Evidence) cleared in a median of 19 days, compared with 117 days for cases without an RFE, a 6x speed ratio consistent with a batch of responses adjudicated promptly.
- The April 2026 filing-month group is 37.4% approved at 23 weeks old; the overall active pending backlog grew +1.7% (to 187,050 cases) over the past 28 days, suggesting intake is outpacing clearance.
- The 4-week forecast carries a wide confidence band, reaching ~114 to 160 days by the week of October 5, reflecting the weak R²=0.20 fit on the 8-week regression.
128 days: the week's high-water mark
The week of September 7, the median final-stage wait for I-539 cases (Application to Extend or Change Nonimmigrant Status) reached 128 days, up 7 days from last week's 121-day reading. That puts this week at the top of the 12-week range, which has run from 94 to 128 days. The outlier_week_high flag fired at z=2.29 against the prior 8-week trend line, meaning this week's reading sits more than two standard deviations above where the recent trajectory would predict. The 12-week trailing average is 113 days, so the current reading is 15 days above that baseline. The year-over-year gap is smaller: the same week in 2025 posted 125 days, a difference of just 3 days (+2.2%). With an 8-week regression R² of only 0.20, the underlying trend is noisy, and one outlier week does not confirm a direction change on its own.
One piece of context the timing aligns with: USCIS announced in August that older editions of Form I-539 will be rejected starting September 15, 2026 (news-001). A short-run filing increase ahead of that deadline could have added recently receipted cases to the pipeline, which may reflect in processing volumes in coming weeks. The data cannot confirm that mechanism, and a single week is not enough to distinguish a one-time intake effect from the beginning of a broader slowdown.
SRC's slope is the one to watch
SRC (the Texas Service Center) handled 2,751 of this week's 3,820 approved cases, or 72% of total volume. Its median sits at 80 days, and it carries a slope of +7.0 days per week with an R² of 0.91, the only center this week with both a steep upward slope and a statistically strong fit. Because 46% of SRC's approvals were transfer-touched (cases originally filed elsewhere and routed to SRC before adjudication (USCIS's decision step)), the population SRC is clearing may differ meaningfully from the population of cases originally filed there; these groups are not directly comparable. WAC (the California Service Center, code WAC) processed 504 cases this week, none transfer-touched, and runs at a median of 251 days with a declining slope of -3.3 days per week. Center medians describe who happened to be approved this week at each location; the case mix differs across centers, so these figures are not a verdict on any center's underlying pace.
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