Best Time to Fly SDF to IAD: On-Time Stats by Hour & Airline
Louisville Muhammad Ali International → Washington Dulles International
Data through July 2026 · Last updated October 18, 2026
236 flights were scheduled from Louisville (SDF) to Washington (IAD) in the last 12 months, and 93.2% of those that flew arrived on time, 15.6 points above the US average of 77.6%.
Republic Airways was the only reporting airline with regular flights on this route.
Over 24 months, Tuesday was the most reliable day (96% on time) and December the worst month (82%).
The cancellation rate was 0.4% (US average 1.8%).
SDF to IAD on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Republic Airways | 94.0% | 88 min | 0.4% | 233 |
| United Airlines | Limited data | 3 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SDF to IAD
On-time arrival % by scheduled departure hour (local time), 802 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 20 | |
| 6am–7am | 94.2% | 0.8% | 245 |
| 9am–10am | 92.3% | 2.1% | 93 |
| 10am–11am | 90.8% | 0.8% | 360 |
| 12pm–1pm | 95.2% | 0.0% | 42 |
| 1pm–2pm | 100.0% | 0.0% | 37 |
| 2pm–3pm | Limited data | 5 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SDF to IAD
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 15 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 15 | ||
| Summer peak (Jun 15 - Aug 15) | 92.4% | -0.8 pts | 0.9% | 225 |
| All other days | 93.2% | — | 0.9% | 547 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).