Flight Reliability
UA 4950 · United Airlines
Washington → ITH (IAD–ITH)
47
Bring Snacks
WanderNerd Reliability Score
- 73%
- Arrive within 15 minutes
- 44 min
- Average arrival delay
- 3.6%
- Cancelled
- 1 min
- Median arrival delay
Based on 364 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
UA 4950 arrived on time 82% of the time on Mondays and just 64% on Sundays. That gap is worth planning around.
A bit behind the United Airlines network.
UA 4950 arrived on time 73% of the time, versus 79% across the United Airlines network.
Keep a backup plan handy.
UA 4950 was cancelled 3.6% of the time. Typical for U.S. flights is around 1–2%.
Ticking up lately.
UA 4950 arrived on time 80% of the time over the last three months in the data, compared with 77% in the three months before that.
The breakdown
- Mon82%(49 flights)
- Tue73%(51 flights)
- Wed69%(49 flights)
- Thu71%(49 flights)
- Fri74%(50 flights)
- Sat80%(50 flights)
- Sun64%(50 flights)
83%
May
Jun 52% → May 83% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 52% | 29 |
| July 2025 | 55% | 29 |
| August 2025 | 63% | 30 |
| September 2025 | 83% | 29 |
| October 2025 | 73% | 30 |
| November 2025 | 79% | 29 |
| December 2025 | 79% | 29 |
| January 2026 | 75% | 28 |
| February 2026 | 78% | 27 |
| March 2026 | 71% | 28 |
| April 2026 | 87% | 30 |
| May 2026 | 83% | 30 |
- Departures on time
- 80%
- Diverted
- 0.8%
- Flights flown
- 348
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 364 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.