Louisville (SDF) to Washington (IAD): On-Time Performance
Data through July 2026
Louisville (SDF) to Washington (IAD) is a thinner route than most in this dataset — 236 departures over the past year, roughly 5 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 93% arrived on time, comfortably above the national average of 78%.
- On-time
- 93%
- arrived <15 min late
- Avg delay
- 6 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 0.65
- last 12 months
- Duration
- 1h 38m
- scheduled
- Distance
- 451 mi
Monthly on-time trend
Best time to fly from SDF to IAD
Aim for departures around 1 p.m. (100% on-time); avoid 10 a.m. departures (91%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Mondaybest | 95% | 4 min |
| Tuesday | 95% | 4 min |
| Wednesday | 95% | 3 min |
| Thursday | 92% | 6 min |
| Friday | 93% | 9 min |
| Saturday | 94% | 3 min |
| Sunday | 84% | 15 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft22%
- Airline operations51%
- National airspace system15%
- Weather12%
Frequently asked questions
- How often are flights from SDF to IAD delayed?
- 8% of SDF–IAD flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 6 minutes.
- What is the best time of day to fly from SDF to IAD?
- Departures around 1 p.m. have the best record (100% on-time), while departures around 10 a.m. have the worst (91%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SDF to IAD?
- The scheduled SDF–IAD flight time averages 1h 38m over 451 miles. Actual arrival times vary — flights on this route land 15+ minutes late 8% of the time.
- How often are SDF to IAD flights cancelled?
- 0.8% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from SDF to IAD?
- February 2025 was the roughest month in this dataset, with only 82% of arrivals on time. The best was August 2025 at 100%. If your dates are flexible, that 19-point gap is worth planning around.
Explore related pages
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Related guides
Based on 864 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.