Route · IAD → SDF · 2020–2025 BTS data
Washington to Louisville
The IAD–SDF corridor (Washington, DC → Louisville, KY) runs ahead of the national average, served by 8 carriers across roughly 451 miles.
Data updated 2026-06-13
- 85.1%
- On-time
- +6.1 pts
- vs US avg
- 101 min
- Delay when late
- 2,295
- Flights
Cancelled
1.0%
Best Month
Oct 2024 95%
Worst Month
Jul 2025 78%
Distance
451 mi
Carriers
8
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Aug 2025 | 46 | 4 | 0 | 0 | YX |
| Jul 2025 | 58 | 13 | 0 | 0 | YX |
| Jun 2025 | 30 | 9 | 0 | 0 | YX |
| May 2025 | 34 | 2 | 0 | 0 | UA,YX |
| Apr 2025 | 50 | 4 | 0 | 0 | YX |
| Mar 2025 | 57 | 6 | 0 | 0 | YX |
| Jan 2025 | 31 | 3 | 3 | 0 | YX |
| Dec 2024 | 33 | 2 | 0 | 0 | YX |
| Nov 2024 | 60 | 5 | 0 | 0 | YX |
| Oct 2024 | 61 | 3 | 0 | 0 | YX |
| Sep 2024 | 60 | 3 | 0 | 0 | YX |
| Aug 2024 | 62 | 11 | 3 | 0 | YX |
| Jul 2024 | 62 | 10 | 0 | 0 | YX |
| Jun 2024 | 60 | 6 | 0 | 0 | YX |
| May 2024 | 45 | 5 | 0 | 0 | YX,UA |
| Apr 2024 | 30 | 5 | 0 | 0 | YX |
| Mar 2024 | 31 | 3 | 0 | 0 | YX |
| Jan 2024 | 31 | 6 | 0 | 0 | YX |
| Dec 2023 | 31 | 3 | 0 | 0 | YX |
| Nov 2023 | 30 | 0 | 0 | 0 | YX |
| Oct 2023 | 31 | 5 | 0 | 0 | YX |
| Sep 2023 | 31 | 5 | 2 | 0 | YX |
| Aug 2023 | 31 | 3 | 1 | 0 | YX |
| Jul 2023 | 32 | 11 | 1 | 0 | YX |
Cancellation Rate
1.0%
10 of 1,027 flights
Diversion Rate
0.0%
0 of 1,027 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
IAD - Washington
Full on-time, delay-cause, and seasonal performance for Washington, DC.
Origin airport →SDF - Louisville
Full on-time, delay-cause, and seasonal performance for Louisville, KY.
Destination airport →Compare the two airports
See IAD and SDF side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to IAD–SDF.
Routes with a similar on-time rate
What the Data Says About IAD to SDF
Washington to Louisville (IAD to SDF) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 85.1% on-time rate across 2,295 flights, with delays that do happen averaging 101.3 minutes. The corridor runs roughly 451 miles and is served by 8 carriers. Over the most recent 24 months, 10 of 1,027 flights were cancelled (1.0%) and 0 diverted (0.0%).
The monthly split is wide on this route: Oct 2024 posted the strongest performance at 95% on-time, while Jul 2025 came in at just 78% - a 18-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from IAD to SDF? ▼
What is the cancellation rate for IAD to SDF? ▼
How far is the flight from IAD to SDF? ▼
When is the best time to fly from IAD to SDF? ▼
Flight Guides
Tips and data-driven advice for choosing reliable routes.
Explore PlainFlights
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.
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.