Louisville (SDF) to Washington (IAD): On-Time Performance
Data through May 2026
Louisville (SDF) to Washington (IAD) is a thinner route than most in this dataset — 201 departures over the past year, roughly 4 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 94% arrived on time, comfortably above the national average of 78%.
- On-time
- 94%
- arrived <15 min late
- Avg delay
- 5 min
- completed flights
- Cancelled
- 0.7%
- Flights/day
- 0.55
- 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 (92%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Mondaybest | 97% | 3 min |
| Tuesday | 95% | 3 min |
| Wednesday | 95% | 3 min |
| Thursday | 91% | 7 min |
| Friday | 96% | 6 min |
| Saturday | 95% | 3 min |
| Sunday | 86% | 12 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft21%
- Airline operations55%
- National airspace system17%
- Weather7%
Frequently asked questions
- How often are flights from SDF to IAD delayed?
- 7% of SDF–IAD flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 5 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 (92%). 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 7% of the time.
- How often are SDF to IAD flights cancelled?
- 0.7% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, 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.
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Based on 802 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.