Best time to fly out of Cyril E. King (STT)
The early-flight folk wisdom bends at Cyril E. King: the steadiest stretch was the 10am–12pm band at 84.5%, while 4–6pm departures managed 75.5%. These are historical odds, not forecasts. The records say what happened on this schedule over three years; they know nothing about tomorrow’s thunderstorm.
Data through June 2026 · Bureau of Transportation Statistics
On-time rate by hour and day
On this page, “on time” means a departure that pushed back less than 15 minutes behind its scheduled time — the Bureau of Transportation Statistics definition, and the one airlines are held to.
| Departure time | Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|---|
| Before 6am | – | – | – | – | – | – | – |
| 6–8am | – | – | – | – | – | – | – |
| 8–10am | – | – | – | – | – | – | – |
| 10am–12pm | 85 | 86 | 80 | 84 | 87 | 85 | 85 |
| 12–2pm | 82 | 84 | 84 | 81 | 84 | 80 | 79 |
| 2–4pm | 74 | 81 | 80 | 76 | 79 | 74 | 75 |
| 4–6pm | 75 | 82 | 83 | 79 | 77 | 66 | 74 |
| 6–8pm | – | – | – | – | – | – | – |
| 8–10pm | – | – | – | – | – | – | – |
| 10pm–12am | – | – | – | – | – | – | – |
The steadiest stretch at STT was 10am–12pm — 84.5% of departures left on time across 1,190 flights. The weakest was 4–6pm at 75.5%.
The year at STT
August was the hard month at STT: 73.7% of departures left on time, across 1,083 flights. October was the easy one at 83.3%. Each month pools three years of that month, so a single bad week does not decide it.
| Month | Share departures that left on time | Flights |
|---|---|---|
| January | 77.1% | 1,661 |
| February | 76% | 1,581 |
| March | 75.1% | 1,928 |
| April | 81.1% | 1,643 |
| May | 80.1% | 1,480 |
| June | 79.8% | 1,417 |
| July | 74.9% | 1,421 |
| August | 73.7% | 1,083 |
| September | 82.1% | 601 |
| October | 83.3% | 737 |
| November | 82.9% | 1,112 |
| December | 80% | 1,512 |
Airlines at STT
Every airline with at least 100 departures from STT, busiest first. These are that airline’s departures from this airport only — its record across the country sits on its own page.
| Airline | Left on time | Typical delay | Cancelled | Departures |
|---|---|---|---|---|
| American Airlines | 79.8% | 134 min | 1% | 6,221 |
| Delta Air Lines | 79.1% | 83 min | 1.6% | 2,840 |
| United Airlines | 84.6% | 66 min | 1.3% | 2,522 |
| Spirit Airlines | 73.8% | 65 min | 1.5% | 2,512 |
| JetBlue Airways | 71.9% | 80 min | 1.6% | 1,713 |
| Southwest Airlines | 67.3% | 35 min | 0.5% | 215 |
| Frontier Airlines | 68.9% | 90 min | 1.3% | 153 |
What delays out of STT were put down to
Airlines file a reason with every arrival running 15 minutes late or more. Across 3,410 flights that departed STT and ran 15 minutes late or more, the delay minutes break down with 49.3% put down to late-arriving aircraft and 33% to airline operations.
- Late-arriving aircraft 49.3%
- Airline operations 33%
- Air traffic & airport volume 15.2%
- Severe weather 2.3%
- Security 0.2%
Late-arriving aircraft is the knock-on category: the plane came in late, so it went out late again. It is why a 7am problem in Newark is still a problem in Denver at dinnertime, and why it is usually the biggest slice on the bar.
If you are connecting through STT
Of 16,174 scheduled arrivals into STT, 78.4% reached the gate less than 15 minutes behind schedule. Of the 3,270 arrivals that ran late, 59.7% were no more than 45 minutes behind — which is the difference between a tight connection and a new boarding pass.
Work out a specific layover — pick the airport and the minutes you have, and the tool reads the same arrival records back as a share.
Busiest routes out of STT
Ranked by flights, with the share that arrived on time at the far end. Where a route carries enough flights for a page of its own the chip goes there; otherwise it goes to the destination airport.
- MIA 80.7% on time · 2,685 flights
- ATL 80.7% on time · 1,988 flights
- SJU 70.2% on time · 1,868 flights
- CLT 80.7% on time · 1,764 flights
- JFK 78.9% on time · 1,617 flights
- MCO 74.3% on time · 1,464 flights
- FLL 77.2% on time · 1,194 flights
- IAD 82.7% on time · 952 flights
- EWR 87.3% on time · 745 flights
- ORD 73.2% on time · 504 flights
STT in one number
Cyril E. King (STT)
Rank 135 of 363 US airports by departures. Steadiest stretch of the day: 10am–12pm. Hardest month: August.
Questions about STT
- What is the best time of day to fly out of Cyril E. King?
- 10am–12pm. Departures in that band left on time 84.5% of the time across 1,190 flights, July 2023 through June 2026 — the best of the ten bands in the day. The 4–6pm band was the weakest at 75.5%.
- What is the worst month to fly out of STT?
- August: 73.7% of the departures that flew left on time, with 1,083 scheduled. October was the other end of the year at 83.3%. Each figure pools three years of that calendar month.
- Which airline is most on time at STT?
- United Airlines — 84.6% of its 2,522 departures from STT left on time. Southwest Airlines sat at the other end at 67.3% over 215 flights. Only airlines with at least 100 departures here are ranked.
- How often are flights cancelled at STT?
- 1.3% of scheduled departures were cancelled over July 2023 through June 2026. Cancellations are counted against everything scheduled, not against everything that flew — a rate that looks small still adds up to real people in a rebooking line.