Flight Reliability
UA 4948 · United Airlines
Washington → MOB (IAD–MOB)
84
Pretty Reliable
WanderNerd Reliability Score
- 81%
- Arrive within 15 minutes
- 11 min
- Average arrival delay
- 0.6%
- Cancelled
- 5 min early
- Median arrival delay
Based on 178 historical flights. Data through May 2026.
What the data says
The 9 AM–12 PM departure wins.
UA 4948 departing between 9 AM–12 PM arrived on time 88% of the time, versus 79% between 6–9 AM.
Wednesdays have been rough.
UA 4948 arrived on time 90% of the time on Tuesdays and just 68% on Wednesdays. That gap is worth planning around.
A bit ahead of the IAD–MOB route.
UA 4948 arrived on time 81% of the time, versus 76% across the IAD–MOB route.
Recent months have been rougher.
UA 4948 arrived on time 79% of the time over the last three months in the data, compared with 88% in the three months before that.
The breakdown
- Mon79%(29 flights)
- Tue90%(20 flights)
- Wed68%(19 flights)
- Thu86%(29 flights)
- Fri79%(29 flights)
- Sat86%(21 flights)
- Sun79%(29 flights)
- 6–9 AM79%(128 flights)
- 9 AM–12 PM88%(48 flights)
64%
Dec
Jun 62% → Dec 64% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 62% | 29 |
| July 2025 | 84% | 31 |
| August 2025 | 87% | 31 |
| September 2025 | 93% | 28 |
| October 2025 | 89% | 18 |
| November 2025 | 85% | 20 |
| December 2025 | 64% | 14 |
- Departures on time
- 83%
- Diverted
- 0.6%
- Flights flown
- 176
- Months covered
- 8
Same route, other flights
Keep nerding
Based on 178 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.