Flight Reliability
UA 4372 · United Airlines
Washington → MDT (IAD–MDT)99% of its flights flew this route. The rest (BUF–IAD) are included in these numbers.
85
Pretty Reliable
WanderNerd Reliability Score
- 83%
- Arrive within 15 minutes
- 6 min
- Average arrival delay
- 1.1%
- Cancelled
- 6 min early
- Median arrival delay
Based on 353 historical flights. Data through May 2026.
What the data says
Friday is doing you no favors.
UA 4372 arrived on time 92% of the time on Saturdays and just 75% on Fridays. That gap is worth planning around.
A bit ahead of the United Airlines network.
UA 4372 arrived on time 83% of the time, versus 79% across the United Airlines network.
Trending in the right direction.
UA 4372 arrived on time 86% of the time over the last three months in the data, compared with 76% in the three months before that.
The breakdown
- Mon86%(50 flights)
- Tue80%(51 flights)
- Wed89%(45 flights)
- Thu75%(52 flights)
- Fri75%(51 flights)
- Sat92%(47 flights)
- Sun87%(52 flights)
- 12–3 PM83%(345 flights)
- 6–9 PM—(3 flights)
83%
May
Jun 77% → May 83% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 77% | 30 |
| July 2025 | 80% | 25 |
| August 2025 | 90% | 29 |
| September 2025 | 93% | 30 |
| October 2025 | 90% | 31 |
| November 2025 | 77% | 30 |
| December 2025 | 83% | 30 |
| January 2026 | 64% | 25 |
| February 2026 | 82% | 27 |
| March 2026 | 87% | 31 |
| April 2026 | 87% | 30 |
| May 2026 | 83% | 30 |
- Departures on time
- 84%
- Diverted
- 0.3%
- Flights flown
- 348
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 353 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.