Route · SDF → IAD · 2020–2025 BTS data
Louisville to Washington
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SDF to IAD (Louisville to Washington) ranks #3658 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 90.9%
- On-time
- +11.9 pts
- vs US avg
- 85 min
- Delay when late
- 2,264
- Flights
- #3658 of 4927
- Corpus placement
Cancelled
0.6%
Best Month
Oct 2024 97%
Worst Month
Aug 2024 92%
Distance
451 mi
Carriers
8
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Aug 2025 | 46 | 0 | 0 | 0 | YX |
| Jul 2025 | 58 | 4 | 0 | 0 | YX |
| May 2025 | 35 | 6 | 0 | 0 | UA,YX |
| Apr 2025 | 50 | 2 | 0 | 0 | YX |
| Mar 2025 | 57 | 2 | 0 | 0 | YX |
| Jan 2025 | 31 | 4 | 4 | 0 | YX |
| Dec 2024 | 34 | 6 | 0 | 0 | YX |
| Nov 2024 | 60 | 3 | 0 | 0 | YX |
| Oct 2024 | 62 | 2 | 0 | 0 | YX |
| Sep 2024 | 60 | 2 | 0 | 0 | YX |
| Aug 2024 | 62 | 5 | 1 | 0 | YX |
| Jul 2024 | 62 | 5 | 0 | 0 | YX |
| Jun 2024 | 60 | 2 | 0 | 0 | YX |
| May 2024 | 44 | 8 | 0 | 0 | YX,UA |
| Apr 2024 | 30 | 0 | 0 | 0 | YX |
| Mar 2024 | 31 | 1 | 0 | 0 | YX |
| Jan 2024 | 30 | 3 | 0 | 0 | YX |
| Dec 2023 | 31 | 2 | 0 | 1 | YX |
| Nov 2023 | 30 | 2 | 0 | 0 | YX |
| Oct 2023 | 31 | 1 | 0 | 0 | YX |
| Sep 2023 | 30 | 3 | 0 | 0 | YX |
| Aug 2023 | 31 | 1 | 0 | 0 | YX |
| Jul 2023 | 32 | 3 | 1 | 0 | YX |
| Jun 2023 | 58 | 3 | 0 | 1 | YX |
SDF–IAD seasonal on-time pattern
Best: April (96.5%) · weakest: December (85.4%)
Strongest calendar month
April
96.5% on-time · ~33 flights/mo
Busiest calendar month
July
~50 flights/mo avg
Weakest calendar month
December
85.4% on-time · ~34 flights/mo
Cancellation Rate
0.6%
6 of 1,055 flights
Diversion Rate
0.2%
2 of 1,055 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SDF - Louisville
Full on-time, delay-cause, and seasonal performance for Louisville, KY.
SDF on-time profileIAD - Washington
Full on-time, delay-cause, and seasonal performance for Washington, DC.
IAD on-time profileCompare the two airports
See SDF and IAD side by side on delays, cancellations, and reliability.
Compare SDF vs IADOrigin-hub reliability standing
Among SDF's stronger departures
SDF → IAD posts a 90.9% on-time rate, landing in the ≥85% band with 9 of 23 BTS-tracked routes leaving Louisville. The same hub also shows 13 mid-band and 1 challenged departures · fleet-wide on-time rank #98 of 4927 (highest on-time = #1).
Similar routes
Other BTS-tracked routes with comparable performance or trip length to SDF–IAD.
Routes with a similar on-time rate
What the Data Says About SDF to IAD
Louisville to Washington (SDF to IAD) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 90.9% on-time rate across 2,264 flights, with delays that do happen averaging 85.0 minutes. The corridor runs roughly 451 miles and is served by 8 carriers. Over the most recent 24 months, 6 of 1,055 flights were cancelled (0.6%) and 2 diverted (0.2%).
Monthly on-time rates stay fairly consistent on this route, ranging from 92% in Aug 2024 to 97% in Oct 2024 - only a 5-point spread.
On the multi-year calendar, SDF–IAD peaks in April at 96.5% on-time while July carries the heaviest traffic (~50 flights per month) ; the softest month is December at 85.4%, a 11.1-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does SDF to IAD rank among US routes by traffic? ▼
How often are flights delayed from SDF to IAD? ▼
What is the cancellation rate for SDF to IAD? ▼
How far is the flight from SDF to IAD? ▼
When is the best time to fly from SDF to IAD? ▼
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 SDF–IAD data
SDF–IAD runs 11.9 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare SDF and IAD airport profiles: delay causes and top routes differ even on the same corridor. SDF airport
- If your dates flex, April (96.5% on-time) beats December (85.4%) on this corridor. Seasonal chart
- 4 other routes post a similar 90.9% 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.