Route · IAH → SDF · 2020–2025 BTS data
Houston to Louisville
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), IAH to SDF (Houston to Louisville) ranks #3890 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 84.4%
- On-time
- +5.4 pts
- vs US avg
- 84 min
- Delay when late
- 1,876
- Flights
- #3890 of 4927
- Corpus placement
Cancelled
1.4%
Best Month
Oct 2022 95%
Worst Month
Aug 2021 59%
Distance
788 mi
Carriers
11
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Aug 2023 | 31 | 4 | 0 | 0 | UA |
| Jul 2023 | 31 | 10 | 0 | 0 | UA |
| Jun 2023 | 30 | 9 | 1 | 0 | UA |
| May 2023 | 41 | 11 | 0 | 0 | AA,MQ,NK,UA |
| Dec 2022 | 57 | 9 | 0 | 0 | YV |
| Nov 2022 | 60 | 6 | 0 | 0 | YV |
| Oct 2022 | 62 | 3 | 0 | 0 | OO,YV |
| Sep 2022 | 56 | 4 | 0 | 0 | OO,YV |
| Aug 2022 | 61 | 13 | 1 | 0 | OO,YV |
| Jul 2022 | 62 | 5 | 0 | 0 | OO,YV |
| Jun 2022 | 60 | 15 | 0 | 0 | OO,YV |
| May 2022 | 65 | 10 | 2 | 0 | UA,YV |
| Apr 2022 | 51 | 4 | 1 | 0 | YV |
| Mar 2022 | 57 | 11 | 0 | 0 | YV |
| Feb 2022 | 56 | 11 | 2 | 0 | YV,OO |
| Jan 2022 | 54 | 16 | 5 | 0 | OO,YV |
| Dec 2021 | 60 | 5 | 2 | 0 | OO,YV |
| Nov 2021 | 73 | 12 | 2 | 0 | YV,OO |
| Oct 2021 | 83 | 17 | 1 | 0 | OO,YV |
| Sep 2021 | 76 | 13 | 1 | 0 | OO,YV |
| Aug 2021 | 58 | 24 | 0 | 0 | YV |
| Jul 2021 | 57 | 17 | 0 | 0 | YV |
| Jun 2021 | 54 | 16 | 1 | 1 | YV |
| May 2021 | 31 | 5 | 0 | 0 | UA,YV |
IAH–SDF seasonal on-time pattern
Best: March (91.2%) · weakest: June (72.2%)
Strongest calendar month
March
91.2% on-time · ~61 flights/mo
Busiest calendar month
February
~69 flights/mo avg
Weakest calendar month
June
72.2% on-time · ~48 flights/mo
Cancellation Rate
1.4%
19 of 1,326 flights
Diversion Rate
0.1%
1 of 1,326 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 profileSDF - Louisville
Full on-time, delay-cause, and seasonal performance for Louisville, KY.
SDF on-time profileCompare the two airports
See IAH and SDF side by side on delays, cancellations, and reliability.
Compare IAH vs SDFOrigin-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: Louisville · fleet on-time rank #1432 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to IAH–SDF.
Routes with a similar on-time rate
Routes of a similar trip length
What the Data Says About IAH to SDF
Bureau of Transportation Statistics records show Houston to Louisville (IAH to SDF) running a 84.4% on-time rate over 1,876 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 83.7 minutes. The 788-mile corridor is served by 11 carriers, and over the last 24 months 1.4% of 1,326 flights were cancelled, 0.1% diverted.
The monthly split is wide on this route: Oct 2022 posted the strongest performance at 95% on-time, while Aug 2021 came in at just 59% - a 37-point swing worth factoring into travel timing.
On the multi-year calendar, IAH–SDF peaks in March at 91.2% on-time while February carries the heaviest traffic (~69 flights per month) ; the softest month is June at 72.2%, a 19.0-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does IAH to SDF rank among US routes by traffic? ▼
How often are flights delayed from IAH to SDF? ▼
What is the cancellation rate for IAH to SDF? ▼
How far is the flight from IAH to SDF? ▼
When is the best time to fly from IAH to SDF? ▼
Airports on this route
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–SDF data
IAH–SDF runs 5.4 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 SDF airport profiles: delay causes and top routes differ even on the same corridor. IAH airport
- If your dates flex, March (91.2% on-time) beats June (72.2%) on this corridor. Seasonal chart
- 4 other routes post a similar 84.4% 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.
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.