Best Time to Fly ORD to STT: On-Time Stats by Hour & Airline
Chicago O'Hare International → Cyril E King
Data through July 2026 · Last updated October 18, 2026
255 flights were scheduled from Chicago (ORD) to Charlotte Amalie (STT) in the last 12 months, and 70.4% of those that flew arrived on time, 7.2 points below the US average of 77.6%.
Among 2 airlines, American Airlines led with 70.4% on time and United Airlines was last with 70.4%.
Over 24 months, Wednesday was the most reliable day (90% on time) and March the worst month (65%).
The cancellation rate was 1.2% (US average 1.8%).
ORD to STT on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| American Airlines | 70.4% | 71 min | 1.0% | 100 |
| United Airlines | 70.4% | 48 min | 1.3% | 155 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly ORD to STT
On-time arrival % by scheduled departure hour (local time), 381 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | Limited data | 28 | |
| 8am–9am | 76.0% | 1.1% | 182 |
| 9am–10am | 67.7% | 0.7% | 135 |
| 10am–11am | 88.6% | 2.8% | 36 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on ORD to STT
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 5 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 84.1% | +8.9 pts | 4.3% | 47 |
| Summer peak (Jun 15 - Aug 15) | Limited data | 16 | ||
| All other days | 75.2% | — | 0.6% | 313 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).