Flight Reliability
UA 4891 · United Airlines
Syracuse → Washington (SYR–IAD)96% of its flights flew this route. The rest (IAH–BTR, IAH–MOB) are included in these numbers.
59
A Little Dicey
WanderNerd Reliability Score
- 77%
- Arrive within 15 minutes
- 24 min
- Average arrival delay
- 4.8%
- Cancelled
- 4 min early
- Median arrival delay
Based on 147 historical flights. Data through May 2026.
What the data says
The 6–9 AM departure wins.
UA 4891 departing between 6–9 AM arrived on time 80% of the time, versus 69% between 3–6 AM.
Tuesdays have been rough.
UA 4891 arrived on time 87% of the time on Mondays and just 70% on Tuesdays. That gap is worth planning around.
Keep a backup plan handy.
UA 4891 was cancelled 4.8% of the time. Typical for U.S. flights is around 1–2%.
The breakdown
- Mon87%(23 flights)
- Tue70%(10 flights)
- Wed81%(16 flights)
- Thu81%(16 flights)
- Fri79%(24 flights)
- Sat70%(27 flights)
- Sun71%(24 flights)
- 3–6 AM69%(32 flights)
- 6–9 AM80%(102 flights)
- 9 AM–12 PM—(1 flights)
- 12–3 PM—(3 flights)
- 9 PM–12 AM—(2 flights)
88%
Apr
Jul 84% → Apr 88% on time
| Month | On-time percentage | Flights |
|---|---|---|
| July 2025 | 84% | 31 |
| August 2025 | 94% | 18 |
| January 2026 | 71% | 17 |
| March 2026 | 65% | 23 |
| April 2026 | 88% | 25 |
- Departures on time
- 84%
- Diverted
- 0%
- Flights flown
- 140
- Months covered
- 9
Same route, other flights
Keep nerding
Based on 147 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.