Washington (IAD) to Charlotte Amalie (STT): On-Time Performance
Data through July 2026
Washington (IAD) to Charlotte Amalie (STT) is a thinner route than most in this dataset — 336 departures over the past year, roughly 6 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 87% arrived on time, comfortably above the national average of 78%.
- On-time
- 87%
- arrived <15 min late
- Avg delay
- 7 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 0.92
- last 12 months
- Duration
- 4h 0m
- scheduled
- Distance
- 1,606 mi
Monthly on-time trend
Best time to fly from IAD to STT
Aim for departures around 12 p.m. (91% on-time); avoid 8 a.m. departures (86%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 87% | 8 min |
| Tuesdaybest | 89% | 5 min |
| Wednesday | 86% | 11 min |
| Thursday | 88% | 8 min |
| Friday | 84% | 8 min |
| Saturday | 85% | 7 min |
| Sunday | 88% | 4 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft11%
- Airline operations31%
- National airspace system46%
- Weather13%
Frequently asked questions
- How often are flights from IAD to STT delayed?
- 14% of IAD–STT flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 7 minutes.
- What is the best time of day to fly from IAD to STT?
- Departures around 12 p.m. have the best record (91% on-time), while departures around 8 a.m. have the worst (86%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from IAD to STT?
- The scheduled IAD–STT flight time averages 4h 0m over 1,606 miles. Actual arrival times vary — flights on this route land 15+ minutes late 14% of the time.
- How often are IAD to STT flights cancelled?
- 0.6% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from IAD to STT?
- August 2024 was the roughest month in this dataset, with only 70% of arrivals on time. The best was April 2026 at 100%. If your dates are flexible, that 30-point gap is worth planning around.
Explore related pages
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Related guides
Based on 680 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.