Flight Reliability
UA 3980 · United Airlines
Washington → Louisville (IAD–SDF)86% of its flights flew this route. The rest (ABQ–IAH, AUS–IAH) are included in these numbers.
- 84%
- Arrive within 15 minutes
- 4 min
- Average arrival delay
- 0.4%
- Cancelled
- 5 min early
- Median arrival delay
Based on 249 historical flights. Data through May 2026.
What the data says
Mondays have been rough.
UA 3980 arrived on time 91% of the time on Wednesdays and just 71% on Mondays. That gap is worth planning around.
A bit ahead of the United Airlines network.
UA 3980 arrived on time 84% of the time, versus 79% across the United Airlines network.
Trending in the right direction.
UA 3980 arrived on time 86% of the time over the last three months in the data, compared with 79% in the three months before that.
The breakdown
- Mon71%(35 flights)
- Tue91%(34 flights)
- Wed91%(35 flights)
- Thu78%(36 flights)
- Fri83%(36 flights)
- Sat86%(36 flights)
- Sun86%(35 flights)
- 12–3 PM84%(245 flights)
- 9 PM–12 AM—(2 flights)
Oct 87% → May 84% on time
| Month | On-time percentage | Flights |
|---|---|---|
| October 2025 | 87% | 31 |
| November 2025 | 87% | 30 |
| December 2025 | 77% | 31 |
| January 2026 | 62% | 29 |
| February 2026 | 96% | 28 |
| March 2026 | 84% | 31 |
| April 2026 | 90% | 30 |
| May 2026 | 84% | 31 |
- Departures on time
- 86%
- Diverted
- 0.4%
- Flights flown
- 247
- Months covered
- 9
Same route, other flights
Keep nerding
Based on 249 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.