78% of flights leaving Killeen (GRK) arrived on time over the past 12 months, 3 points better than the national average of 76%. About 5 flights leave GRK on a typical day; 4.3% were cancelled. 79% 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: 10 a.m. (87% on time). Worst: 10 a.m. (87%).
- Best month: February (87%). Worst: June (68%).
- Biggest delay cause: late-arriving aircraft (38% of delay minutes).
- Year on year: improving (77% → 78%).
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 GRK: when a flight was late, it was under 45 minutes late 47% of the time. About 1 in 14 flights landed an hour or more late, and 1 in 52 three hours or more; 4.3% were cancelled outright.
- On time or early78%
- 15–30 min late5.5%
- 30–60 min late4.7%
- 1–2 hours late3.9%
- 2–3 hours late1.2%
- 3+ hours late1.9%
- Diverted0.2%
- Cancelled4.3%
Share of all 1,938 scheduled flights, past 12 months, by arrival time against schedule.
Best time of day to fly out of GRK
GRK is unusually consistent through the day. Flights scheduled to leave at 10 a.m. arrived on time 87% of the time; at 10 a.m. it was 87%, a 0-point gap. Taken together, early departures (5–9 a.m.) ran 86% on time against 67% for the evening bank (5–10 p.m.). 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.
Hour × month
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
June is the hardest month at GRK, with 68% of flights on time across 2023–2026; February is the best at 87%. Summer (June–August) runs 5 points worse than autumn: heavy schedules, peak loads and afternoon thunderstorms. Cancellations peak in January (9.9% of flights).
Airlines at GRK
American Airlines runs 100% of departures from GRK, so GRK is effectively its hub. When American Airlines has a bad day, so does the airport.
| Airline | Departures | On time | Left on time | Cancelled | Typical arrival |
|---|---|---|---|---|---|
| American Airlines | 1,938 | 78% | 79% | 4.3% | −8 min |
Why flights are late at GRK
Airlines report a cause for every flight that arrives 15 or more minutes late. At GRK, 38% 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 35%. 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 83 cancellations, 78% were blamed on weather.
The average taxi from gate to takeoff is 17 minutes, about typical for a large U.S. airport.
GRK vs nearby airports
| Airport | Distance | Departures | On time | Cancelled |
|---|---|---|---|---|
| GRK Killeen / Robert Gray Army Airfield | — | 1,938 | 78% | 4.3% |
| ACT Waco | 52 mi | 1,072 | 82% | 3.8% |
Month by month
Over the latest 12 months 78% of GRK departures were on time, against 77% in the 12 months before, an improvement of 1 points. The best recent month was August 2026 (85%); the worst, January 2026 (70%).
Last flights of the day
The last flight of the day is a different bet. Across routes from GRK, each airline's final departure was cancelled 6.6% of the time, against 3.8% for its earlier flights (1.8× as often). Late in the day crews run short on duty hours, aircraft arrive late from elsewhere, and with no later flight to fold passengers into, cancelling is easier for the airline. 1.1% of last flights landed 3+ hours late. The riskiest last flight out was American Airlines to Dallas (6.6% cancelled).
| Last flight to | Airline | Leaves | Cancelled | 3h+ late | On time |
|---|---|---|---|---|---|
| DFW Dallas | American Airlines | 7:22 p.m. | 6.6% | 1.1% | 67% |
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 GRK
- Book the earliest departure you can live with. At GRK the 10 a.m. flights do best.
- Traveling in June? Leave extra slack for anything that can't move: cruises, weddings, the last connection of the day.
- Need to arrive tonight? Don't book the last flight out of GRK; the one before it leaves you a backup.
- Delayed already? Most delays at GRK come from late-arriving aircraft. If your inbound plane is late, your flight will be too, whatever the board says.
Routes from GRK
Least reliable first. Routes with at least 365 flights a year.
| To | Flights | On time | Cancelled | Typical arrival |
|---|---|---|---|---|
| DFW Dallas | 1,938 | 78% | 4.3% | −8 min |
Flights into GRK
Arriving rather than leaving? These are the routes into Killeen / Robert Gray Army Airfield, least reliable first. The weakest is from Dallas (76% on time).
| From | Flights | On time | Cancelled |
|---|---|---|---|
| DFW Dallas | 1,939 | 76% | 4.1% |
Questions about GRK delays
What is the best time to fly out of GRK?
Flights scheduled at 10 a.m.: over the past year 87% of GRK departures at that hour arrived on time, against 87% at 10 a.m., the worst hour.
What month has the most flight delays at GRK?
June (68% on time). February is the best month (87%).
Why are flights delayed at GRK?
The biggest cause was late-arriving aircraft (38% of delay minutes): the plane showed up late from its previous flight, so the delay started somewhere else. Then the airlines themselves (35%).
How often are flights cancelled at GRK?
4.3% of scheduled departures over the past 12 months, peaking in January at 9.9%.
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.