Flight Reliability
UA 4848 · United Airlines
Knoxville → Washington (TYS–IAD)
77
Usually Fine
WanderNerd Reliability Score
- 79%
- Arrive within 15 minutes
- 4 min
- Average arrival delay
- 1.9%
- Cancelled
- 8 min early
- Median arrival delay
Based on 362 historical flights. Data through May 2026.
What the data says
Friday is doing you no favors.
UA 4848 arrived on time 84% of the time on Mondays and just 69% on Fridays. That gap is worth planning around.
A bit behind the TYS–IAD route.
UA 4848 arrived on time 79% of the time, versus 84% across the TYS–IAD route.
The breakdown
- Mon84%(51 flights)
- Tue84%(50 flights)
- Wed82%(50 flights)
- Thu78%(50 flights)
- Fri69%(51 flights)
- Sat80%(50 flights)
- Sun75%(51 flights)
77%
May
Jun 67% → May 77% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 67% | 30 |
| July 2025 | 56% | 27 |
| August 2025 | 68% | 31 |
| September 2025 | 80% | 30 |
| October 2025 | 93% | 30 |
| November 2025 | 77% | 30 |
| December 2025 | 87% | 31 |
| January 2026 | 78% | 27 |
| February 2026 | 85% | 27 |
| March 2026 | 87% | 31 |
| April 2026 | 90% | 29 |
| May 2026 | 77% | 30 |
- Departures on time
- 87%
- Diverted
- 0.6%
- Flights flown
- 353
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 362 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.