Best time to fly out of Killeen (GRK)
The early-flight folk wisdom holds up at Killeen / Robert Gray Army Airfield: departures in the Before 6am band left on time 92.8% of the time, against 71.2% in the 4–6pm band. 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 | 93 | 94 | 90 | 92 | 96 | 93 | 91 |
| 6–8am | – | – | – | – | – | – | – |
| 8–10am | – | – | – | – | – | – | – |
| 10am–12pm | 82 | 88 | 83 | 84 | 78 | 81 | 77 |
| 12–2pm | – | – | – | – | – | – | – |
| 2–4pm | – | – | – | – | – | – | – |
| 4–6pm | 69 | 83 | 64 | 75 | 68 | – | 69 |
| 6–8pm | 74 | 75 | 82 | 71 | 71 | 78 | 76 |
| 8–10pm | – | – | – | – | – | – | – |
| 10pm–12am | – | – | – | – | – | – | – |
The steadiest stretch at GRK was Before 6am — 92.8% of departures left on time across 883 flights. The weakest was 4–6pm at 71.2%.
The year at GRK
June was the hard month at GRK: 70.2% of departures left on time, across 467 flights. February was the easy one at 86.8%. 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 | 81.8% | 426 |
| February | 86.8% | 373 |
| March | 80.1% | 418 |
| April | 81.6% | 461 |
| May | 78.1% | 487 |
| June | 70.2% | 467 |
| July | 75.2% | 465 |
| August | 83.3% | 441 |
| September | 80.7% | 417 |
| October | 85.7% | 497 |
| November | 82.8% | 481 |
| December | 86.7% | 470 |
Airlines at GRK
Every airline with at least 100 departures from GRK, 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 |
|---|---|---|---|---|
| Envoy Air | 80.8% | 67 min | 2.6% | 3,735 |
| SkyWest Airlines | 81.5% | 86 min | 4.2% | 1,668 |
What delays out of GRK were put down to
Airlines file a reason with every arrival running 15 minutes late or more. Across 1,053 flights that departed GRK and ran 15 minutes late or more, the delay minutes break down with 39.6% put down to late-arriving aircraft and 28.2% to airline operations.
- Late-arriving aircraft 39.6%
- Airline operations 28.2%
- Air traffic & airport volume 12.6%
- Severe weather 19.3%
- 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 GRK
Of 5,404 scheduled arrivals into GRK, 75.7% reached the gate less than 15 minutes behind schedule. Of the 1,146 arrivals that ran late, 55.3% 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 GRK
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.
- DFW 79.9% on time · 5,403 flights
GRK in one number
Killeen / Robert Gray Army Airfield (GRK)
Rank 202 of 363 US airports by departures. Steadiest stretch of the day: Before 6am. Hardest month: June.
Questions about GRK
- What is the best time of day to fly out of Killeen / Robert Gray Army Airfield?
- Before 6am. Departures in that band left on time 92.8% of the time across 883 flights, July 2023 through June 2026 — the best of the ten bands in the day. The 4–6pm band was the weakest at 71.2%.
- What is the worst month to fly out of GRK?
- June: 70.2% of the departures that flew left on time, with 467 scheduled. February was the other end of the year at 86.8%. Each figure pools three years of that calendar month.
- Which airline is most on time at GRK?
- SkyWest Airlines — 81.5% of its 1,668 departures from GRK left on time. Envoy Air sat at the other end at 80.8% over 3,735 flights. Only airlines with at least 100 departures here are ranked.
- How often are flights cancelled at GRK?
- 3.1% 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.