76% of flights leaving Charlotte Amalie (STT) arrived on time over the past 12 months, right at the national average of 76%. About 15 flights leave STT on a typical day; 1.7% were cancelled. 75% pushed back from the gate on time, so most of the lateness is already there when the flight leaves the gate.
At a glance
- Best hour to fly: 1 p.m. (80% on time). Worst: 2 p.m. (73%).
- Best month: October (85%). Worst: August (70%).
- Most reliable airline here: American Airlines (78%), vs Delta Air Lines at 78%.
- Biggest delay cause: late-arriving aircraft (48% of delay minutes).
- Year on year: getting worse (81% → 76%).
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for flights leaving STT: when a flight was late, it was under 45 minutes late 53% of the time. About 1 in 13 flights landed an hour or more late, and 1 in 64 three hours or more; 1.7% were cancelled outright.
- On time or early76%
- 15–30 min late6.8%
- 30–60 min late6.0%
- 1–2 hours late4.0%
- 2–3 hours late1.9%
- 3+ hours late1.6%
- Diverted1.9%
- Cancelled1.7%
Share of all 5,479 scheduled flights, past 12 months, by arrival time against schedule.
Best time of day to fly out of STT
STT is unusually consistent through the day. Flights scheduled to leave at 1 p.m. arrived on time 80% of the time; at 2 p.m. it was 73%, a 7-point gap. Early planes usually start the day at the airport, so they haven't had a chance to pick up delays elsewhere. By evening a late inbound aircraft, a crew running out of duty hours or an afternoon thunderstorm can push one late flight into the next. Cancellations cluster too: 5 p.m. departures were cancelled 2.8% of the time, against 1.7% overall.
Hour × month
Combine the two and the spread is wider still. The most reliable combination at STT was a 4 p.m. departure in October (91% on time); the least, 4 p.m. in August (63%). If you can only move one thing, move the hour. Departure hour usually shifts the odds more than the month does.
Each cell: on-time rate for that departure hour in that calendar month, 2023–2026. Find your travel month, then look along the row for the greenest hour.
Best and worst months
August is the hardest month at STT, with 70% of flights on time across 2023–2026; October is the best at 85%. Summer (June–August) runs 8 points worse than autumn: heavy schedules, peak loads and afternoon thunderstorms. Winter costs 8 points against autumn. Cancellations peak in January (3.5% of flights).
Airlines at STT
American Airlines runs 41% of departures from STT. Among airlines with at least 1,000 departures here, American Airlines was the most reliable (78% on time) and Delta Air Lines the least (78%), a 0-point difference. On a route where both fly, that difference is worth more than a small fare gap.
| Airline | Departures | On time | Left on time | Cancelled | Typical arrival |
|---|---|---|---|---|---|
| American Airlines | 2,273 | 78% | 76% | 1.3% | −16 min |
| Delta Air Lines | 1,087 | 78% | 76% | 2.6% | −13 min |
| United Airlines | 896 | 80% | 81% | 1.6% | −11 min |
| JetBlue | 550 | 69% | 71% | 2.0% | −3 min |
| Spirit Airlines | 394 | 68% | 65% | 2.5% | −4 min |
| Southwest Airlines | 279 | 67% | 67% | 0.4% | +1 min |
Why flights are late at STT
Airlines report a cause for every flight that arrives 15 or more minutes late. At STT, 48% of delay minutes came from late-arriving aircraft: the plane showed up late from its previous flight, so the delay started somewhere else. Next is the airlines themselves at 37%. That's why the first flight of the morning is the safest bet: it has no earlier flight to inherit a delay from. Of the 93 cancellations, 39% were blamed on weather, so most were within the airlines’ control or the air traffic system’s.
The average taxi from gate to takeoff is 16 minutes, about typical for a large U.S. airport.
STT vs nearby airports
| Airport | Distance | Departures | On time | Cancelled |
|---|---|---|---|---|
| STT Cyril E. King | — | 5,479 | 76% | 1.7% |
| STX Henry E. Rohlsen | 45 mi | 1,354 | 76% | 1.6% |
Month by month
Over the latest 12 months 76% of STT departures were on time, against 81% in the 12 months before, a decline of 5 points. The best recent month was October 2025 (90%); the worst, January 2026 (63%).
Worst cancellation days
The worst single day in the past year was Saturday, Jan 3, 2026, when 100% of 24 scheduled departures were cancelled. Days like that are usually a major storm, a system outage or a holiday peak hitting bad weather. No average predicts them, so on a stormy forecast, check your airline's travel waivers.
| Date | Departures | Cancelled | On time |
|---|---|---|---|
| Jan 3, 2026 | 24 | 100% | 0% |
| Jan 25, 2026 | 20 | 45% | 25% |
| Feb 23, 2026 | 23 | 26% | 48% |
| Feb 22, 2026 | 24 | 21% | 38% |
| Jan 27, 2026 | 15 | 20% | 40% |
| Jan 12, 2026 | 19 | 16% | 63% |
| Jan 26, 2026 | 19 | 16% | 42% |
| Jan 5, 2026 | 21 | 10% | 5% |
| Feb 24, 2026 | 21 | 10% | 81% |
| Aug 7, 2026 | 11 | 9% | 73% |
Last flights of the day
The last flight of the day is a different bet. Across routes from STT, each airline's final departure was cancelled 1.0% of the time, against 2.0% for its earlier flights, so at STT the last flight is actually the steadier one. 1.5% of last flights landed 3+ hours late. The riskiest last flight out was JetBlue to San Juan (1.6% cancelled).
| Last flight to | Airline | Leaves | Cancelled | 3h+ late | On time |
|---|---|---|---|---|---|
| SJU San Juan | JetBlue | 3:48 p.m. | 1.6% | 3.2% | 70% |
| CLT Charlotte | American Airlines | 4:42 p.m. | 1.1% | 1.5% | 82% |
| ATL Atlanta | Delta Air Lines | 3:29 p.m. | 1.2% | 0.8% | 82% |
| MIA Miami | American Airlines | 4:49 p.m. | 0.3% | 0.9% | 82% |
Each airline's last scheduled departure of the day on a route, on days it flies the route at least twice; past 12 months. Riskiest first.
Tips for flying out of STT
- Book the earliest departure you can live with. At STT the 1 p.m. flights do best.
- Traveling in August? Leave extra slack for anything that can't move: cruises, weddings, the last connection of the day.
- Choosing between airlines? American Airlines has the better record here.
- Delayed already? Most delays at STT come from late-arriving aircraft. If your inbound plane is late, your flight will be too, whatever the board says.
Routes from STT
Least reliable first. Routes with at least 365 flights a year.
| To | Flights | On time | Cancelled | Typical arrival |
|---|---|---|---|---|
| SJU San Juan | 550 | 69% | 2.0% | −3 min |
| MCO Orlando | 368 | 71% | 1.9% | −3 min |
| JFK New York | 546 | 74% | 2.8% | −12 min |
| ATL Atlanta | 719 | 79% | 1.9% | −12 min |
| MIA Miami | 941 | 81% | 0.7% | −16 min |
| CLT Charlotte | 609 | 85% | 1.3% | −21 min |
Flights into STT
Arriving rather than leaving? These are the routes into Cyril E. King, least reliable first. The weakest is from Atlanta (76% on time).
| From | Flights | On time | Cancelled |
|---|---|---|---|
| ATL Atlanta | 719 | 76% | 0.7% |
| MCO Orlando | 368 | 76% | 1.1% |
| MIA Miami | 941 | 78% | 0.4% |
| JFK New York | 546 | 78% | 2.2% |
| CLT Charlotte | 609 | 80% | 1.1% |
Questions about STT delays
What is the best time to fly out of STT?
Flights scheduled at 1 p.m.: over the past year 80% of STT departures at that hour arrived on time, against 73% at 2 p.m., the worst hour.
What month has the most flight delays at STT?
August (70% on time). October is the best month (85%).
Which airline is most on time at STT?
American Airlines: 78% of its STT departures arrived on time over the past year. Delta Air Lines had the weakest record at 78%.
Why are flights delayed at STT?
The biggest cause was late-arriving aircraft (48% of delay minutes): the plane showed up late from its previous flight, so the delay started somewhere else. Then the airlines themselves (37%).
How often are flights cancelled at STT?
1.7% of scheduled departures over the past 12 months, peaking in January at 3.5%.
Hours are scheduled local departure times. "On time" means arriving less than 15 minutes late at the destination; cancelled and diverted flights count as not on time. Method.