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Route · IAH → GRK · 2020–2025 BTS data

Houston to Killeen

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), IAH to GRK (Houston to Killeen) ranks #4620 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

83.8%
On-time
+4.8 pts
vs US avg
89 min
Delay when late
844
Flights
#4620 of 4927
Corpus placement

Cancelled

2.5%

Best Month

Mar 2020 96%

Worst Month

Jul 2021 49%

Distance

166 mi

Carriers

3

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2021 48 6 0 0 OO
Nov 2021 59 3 0 0 OO
Oct 2021 61 9 1 0 OO
Sep 2021 59 6 0 0 OO
Aug 2021 62 10 0 0 OO
Jul 2021 79 40 3 0 OO
Jun 2021 73 30 0 0 OO
May 2021 49 11 1 0 OO
Apr 2021 48 5 0 0 OO
Oct 2020 31 0 0 0 OO
Apr 2020 30 1 0 0 EV
Mar 2020 89 4 16 0 EV
Feb 2020 80 7 0 0 EV
Jan 2020 76 5 0 3 EV,YX

IAH–GRK seasonal on-time pattern

Best: March (95.5%) · weakest: July (49.4%)

40%60%80%100% JanFebMarAprMayJunJulAugSepOctNovDec 87.5%

Strongest calendar month

March

95.5% on-time · ~89 flights/mo

Busiest calendar month

March

~89 flights/mo avg

Weakest calendar month

July

49.4% on-time · ~79 flights/mo

Cancellation Rate

2.5%

21 of 844 flights

Diversion Rate

0.4%

3 of 844 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

IAH - Houston

Full on-time, delay-cause, and seasonal performance for Houston, TX.

IAH on-time profile

GRK - Killeen

Full on-time, delay-cause, and seasonal performance for Killeen, TX.

GRK on-time profile

Compare the two airports

See IAH and GRK side by side on delays, cancellations, and reliability.

Compare IAH vs GRK

Origin-hub reliability standing

Mid-pack among IAH departures

From IAH, this corridor sits with 79 other 75–85% on-time routes out of 102 tracked departures, not the hub's reliability leaders (17 at ≥85%) and not the softest ( 6 below 75%). Destination: Killeen · fleet on-time rank #1653 of 4927.

What the Data Says About IAH to GRK

Bureau of Transportation Statistics records show Houston to Killeen (IAH to GRK) running a 83.8% on-time rate over 844 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 89.4 minutes. The 166-mile corridor is served by 3 carriers, and over the last 24 months 2.5% of 844 flights were cancelled, 0.4% diverted.

The monthly split is wide on this route: Mar 2020 posted the strongest performance at 96% on-time, while Jul 2021 came in at just 49% - a 46-point swing worth factoring into travel timing.

On the multi-year calendar, IAH–GRK peaks in March at 95.5% on-time ; the softest month is July at 49.4%, a 46.1-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does IAH to GRK rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, IAH to GRK ranks #4620 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from IAH to GRK? ▼
Flights from Houston to Killeen have a 83.8% on-time rate based on 844 flights. The average delay is 89.4 minutes. The best recent month was Mar 2020 with 96% on-time.
What is the cancellation rate for IAH to GRK? ▼
Over the last 24 months, 2.5% of flights on this route were cancelled (21 of 844 flights) and 0.4% were diverted.
How far is the flight from IAH to GRK? ▼
The flight distance from Houston (IAH) to Killeen (GRK) is approximately 166 miles. This route is served by 3 carriers.
When is the best time to fly from IAH to GRK? ▼
The best recent month for on-time performance was Mar 2020 (96% on-time). The worst was Jul 2021 (49% on-time). Consider booking during months with historically better performance.

Airports on this route

IAH Airport

Houston
GRK Airport

Killeen
Data source

Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.

Read our methodology - how this data is sourced, computed, and verified.

Using IAH–GRK data

IAH–GRK runs 4.8 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare IAH and GRK airport profiles: delay causes and top routes differ even on the same corridor. IAH airport
  • If your dates flex, March (95.5% on-time) beats July (49.4%) on this corridor. Seasonal chart
  • 4 other routes post a similar 83.8% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.