How WaitDelta Works
Last updated: 8 April 2026
WaitDelta is a visa intelligence platform that converts official US State Department wait time data into actionable planning information for Indian visa applicants. The data shown on every page originates from the U.S. Department of State's Global Visa Wait Times portal — the same source used by immigration attorneys, consular officers, and US embassies worldwide.
Where the Data Comes From
Every wait time figure on WaitDelta originates from one source — the official U.S. Department of State Global Visa Wait Times portal at travel.state.gov.
The State Department publishes interview wait time estimates for every US consulate globally. Figures reflect the average time applicants waited for an interview in the previous 30-day period, updated monthly.
The portal organises wait times into three visa categories:
- Visitor (B-1/B-2)
- Student/Exchange (F, M, J)
- All Other Non-immigrant (H, L, O, P, Q)
WaitDelta maps these three official categories to four applicant-facing visa types:
| State Dept category | WaitDelta visa type |
|---|---|
| Student/Exchange (F, M, J) | F-1 Student Visa |
| Visitor (B-1/B-2) | B-1/B-2 Visitor Visa |
| All Other Non-immigrant (H, L, O, P, Q) | H-1B Work Visa |
| All Other Non-immigrant (H, L, O, P, Q) | L-1 Intracompany Transfer Visa |
How WaitDelta Tracks Wait Times Over Time
WaitDelta records every monthly data point with a timestamp to build a historical series — this is the foundation of every trend chart and comparison on the platform.
Each data point is stored with:
- Consulate city and official post name
- Visa category
- Wait time in calendar days
- Date recorded
- Source URL
After 90 days of data collection, a 90-day history chart becomes available for each consulate and visa type combination. Data is never deleted — the historical record grows permanently with each monthly update.
WaitDelta currently tracks 5 consulates × 4 visa types = 20 independent time series updated every month.
How the Up and Down Trend Indicators Are Calculated
WaitDelta calculates the trend by comparing the current wait time against the figure recorded approximately 30 days prior at the same consulate for the same visa category.
Trend formula
Trend delta = current wait days − wait days from 30 days ago
A downward indicator ↓ means the wait time decreased — appointments are becoming available faster. An upward indicator ↑ means the wait time increased — the queue is lengthening. The number shown is the absolute change in calendar days.
Example
Mumbai F-1 shows ↓ 12 days. This means the current wait of 98 days is 12 days shorter than the 110-day figure recorded last month.
How Consulate-Level Data Is Organised
Each city page on WaitDelta maps to one specific US consular post — the data shown for Mumbai reflects only the U.S. Consulate General Mumbai, not India-wide figures.
| City | Official post name |
|---|---|
| Mumbai | U.S. Consulate General Mumbai |
| New Delhi | U.S. Embassy New Delhi |
| Chennai | U.S. Consulate General Chennai |
| Hyderabad | U.S. Consulate General Hyderabad |
| Kolkata | U.S. Consulate General Kolkata |
Each consulate maintains an independent appointment queue. Wait times at Chennai and Mumbai may differ by several months for the same visa category — consulate selection is one of the most impactful decisions an applicant can make. Use the consulate comparison tool to see wait times side by side before booking.
The Limits of This Data
Use WaitDelta figures as planning estimates — not guaranteed appointment dates.
Wait times are estimates, not guarantees. The State Department states these are averages based on the previous month. Actual appointment availability may differ from the published figure at any given time.
WaitDelta does not generate or modify the underlying wait time figures. All figures are displayed as published by the U.S. Department of State.
Administrative processing time is not included. The post-interview administrative processing period — typically 3–10 business days — is separate from the published wait time and is not reflected in the figures on WaitDelta. Plan for this additional time when calculating your total visa lead time.
Emergency and expedited appointments are not reflected. Emergency and expedited appointment slots operate outside the standard queue and are not captured in the published wait time figures.
"Not Available" means no standard appointments exist. When the State Department portal shows no standard appointment availability for a consulate and visa category, WaitDelta reflects this accurately where applicable.
How Often WaitDelta Updates
WaitDelta updates wait time data monthly, aligned with the State Department's own publication schedule.
- State Department: publishes updated wait times monthly
- WaitDelta pipeline: monthly data pull from the official source
- Historical data: permanently stored, never overwritten — each update adds a new data point to the series
- Trend calculations: automatically recalculated on each update using the 30-day comparison formula
Accuracy and Disclaimer
WaitDelta displays official U.S. Department of State data as published. We do not modify, interpret, or guarantee the accuracy of underlying government figures. Visa policies and appointment availability can change without notice.
Always verify current wait times directly at travel.state.gov before making travel or application decisions.
WaitDelta is an independent platform and is not affiliated with the U.S. Department of State, U.S. Embassy, or any US government body.