STT to IAD flight delays & on-time performance
Nonstop flights from Cyril E. King Airport to Washington Dulles International Airport · 1,606 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at STT or IAD right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Charlotte Amalie (STT) to Washington (IAD) arrived on time 82% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 1.8% were cancelled, and 7% arrived an hour or more late.
- United Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 5pm did best (84% on time); around 12pm did worst (76%).
- Thursday was the most reliable day to fly (89% on time) and Sunday the least (71%).
- The largest source of delay minutes was late-arriving aircraft (56%).
Which airline is most on time from STT to IAD?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| United Airlines | 82% | 1.8% | 13 min | 7.1% | 336 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 12pm76%43 flights
- 1pm83%125 flights
- 4pm82%148 flights
- 5pm84%20 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday85%0.0% cancelled
- Tuesday80%0.0% cancelled
- Wednesday79%0.0% cancelled
- Thursday89%0.0% cancelled
- Friday85%0.0% cancelled
- Saturday84%4.6% cancelled
- Sunday71%6.5% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft56%
- Airline (crew, maintenance, cleaning, fueling)24%
- Air traffic control & airport congestion20%
- Extreme weather1%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather50%
- Air traffic control & airport congestion50%
- Airline (crew, maintenance, cleaning, fueling)0%
- Security0%
STT to IAD: common questions
- How often are STT to IAD flights on time?
- 82% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Charlotte Amalie to Washington cancelled?
- 1.8% of scheduled flights were cancelled (6 of 336).
- How long are typical delays?
- Across all flights the average arrival delay was 13 min (early arrivals count as zero). Flights that were late arrived 67 min behind schedule on average, and 7.1% of flights were an hour or more late.
- How long is taxi time at STT?
- Flights on this route spent 17 min taxiing from the gate to takeoff on average.
Related routes
Return trip: IAD to STT — 88% on time
More flights from Charlotte Amalie
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: STT → IAD, nonstop flights by US airlines that report to the DOT. How we calculate this.