Flight Reliability
UA 1849 · United Airlines
San Francisco → Washington (SFO–IAD)
78
Usually Fine
WanderNerd Reliability Score
- 82%
- Arrive within 15 minutes
- 7 min
- Average arrival delay
- 2.2%
- Cancelled
- 4 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
Saturdays have been rough.
UA 1849 arrived on time 90% of the time on Tuesdays and just 71% on Saturdays. That gap is worth planning around.
Ticking up lately.
UA 1849 arrived on time 93% of the time over the last three months in the data, compared with 89% in the three months before that.
The breakdown
- Mon75%(51 flights)
- Tue90%(51 flights)
- Wed81%(52 flights)
- Thu82%(49 flights)
- Fri90%(51 flights)
- Sat71%(51 flights)
- Sun84%(49 flights)
100%
May
Jun 57% → May 100% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 57% | 28 |
| July 2025 | 69% | 29 |
| August 2025 | 67% | 30 |
| September 2025 | 73% | 30 |
| October 2025 | 84% | 31 |
| November 2025 | 83% | 29 |
| December 2025 | 87% | 31 |
| January 2026 | 87% | 30 |
| February 2026 | 93% | 28 |
| March 2026 | 93% | 27 |
| April 2026 | 87% | 30 |
| May 2026 | 100% | 31 |
- Departures on time
- 89%
- Diverted
- 0.8%
- Flights flown
- 354
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 365 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.