PlainFlights

Route · GRK → IAH · 2020–2025 BTS data

Killeen to Houston

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), GRK to IAH (Killeen to Houston) ranks #4623 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

84%
On-time
+5 pts
vs US avg
107 min
Delay when late
843
Flights
#4623 of 4927
Corpus placement

Cancelled

2.6%

Best Month

Mar 2020 89%

Worst Month

Jun 2021 70%

Distance

166 mi

Carriers

3

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2021 48 6 1 0 OO
Nov 2021 59 8 0 0 OO
Oct 2021 61 9 0 1 OO
Sep 2021 59 11 1 0 OO
Aug 2021 62 8 0 0 OO
Jul 2021 79 23 3 0 OO
Jun 2021 73 22 0 0 OO
May 2021 49 6 1 1 OO
Apr 2021 48 4 0 0 OO
Oct 2020 31 2 0 0 OO
Apr 2020 30 2 0 0 EV
Mar 2020 89 10 16 0 EV
Feb 2020 80 12 0 0 EV
Jan 2020 75 12 0 0 EV,YX

GRK–IAH seasonal on-time pattern

Best: April (92.3%) · weakest: June (69.9%)

65%70%75%80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 87.5%

Strongest calendar month

April

92.3% on-time · ~39 flights/mo

Busiest calendar month

March

~89 flights/mo avg

Weakest calendar month

June

69.9% on-time · ~73 flights/mo

Cancellation Rate

2.6%

22 of 843 flights

Diversion Rate

0.2%

2 of 843 flights

Explore origin & destination

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

GRK - Killeen

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

GRK on-time profile

IAH - Houston

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

IAH on-time profile

Compare the two airports

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

Compare GRK vs IAH

Origin-hub reliability standing

Mid-pack among GRK departures

From GRK, this corridor sits with 2 other 75–85% on-time routes out of 2 tracked departures, not the hub's reliability leaders (0 at ≥85%) and not the softest ( 0 below 75%). Destination: Houston · fleet on-time rank #1567 of 4927.

What the Data Says About GRK to IAH

Bureau of Transportation Statistics records show Killeen to Houston (GRK to IAH) running a 84% on-time rate over 843 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 106.6 minutes. The 166-mile corridor is served by 3 carriers, and over the last 24 months 2.6% of 843 flights were cancelled, 0.2% diverted.

The monthly split is wide on this route: Mar 2020 posted the strongest performance at 89% on-time, while Jun 2021 came in at just 70% - a 19-point swing worth factoring into travel timing.

On the multi-year calendar, GRK–IAH peaks in April at 92.3% on-time while March carries the heaviest traffic (~89 flights per month) ; the softest month is June at 69.9%, a 22.4-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does GRK to IAH rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, GRK to IAH ranks #4623 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 GRK to IAH? ▼
Flights from Killeen to Houston have a 84% on-time rate based on 843 flights. The average delay is 106.6 minutes. The best recent month was Mar 2020 with 89% on-time.
What is the cancellation rate for GRK to IAH? ▼
Over the last 24 months, 2.6% of flights on this route were cancelled (22 of 843 flights) and 0.2% were diverted.
How far is the flight from GRK to IAH? ▼
The flight distance from Killeen (GRK) to Houston (IAH) is approximately 166 miles. This route is served by 3 carriers.
When is the best time to fly from GRK to IAH? ▼
The best recent month for on-time performance was Mar 2020 (89% on-time). The worst was Jun 2021 (70% on-time). Consider booking during months with historically better performance.

Airports on this route

GRK Airport

Killeen
IAH Airport

Houston
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 GRK–IAH data

GRK–IAH runs 5 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare GRK and IAH airport profiles: delay causes and top routes differ even on the same corridor. GRK airport
  • If your dates flex, April (92.3% on-time) beats June (69.9%) on this corridor. Seasonal chart
  • 4 other routes post a similar 84% 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.