Flight Reliability
UA 1543 · United Airlines
Newark → San Juan (EWR–SJU)
61
A Little Dicey
WanderNerd Reliability Score
- 65%
- Arrive within 15 minutes
- 20 min
- Average arrival delay
- 1.6%
- Cancelled
- 3 min
- Median arrival delay
Based on 364 historical flights. Data through May 2026.
What the data says
Mondays have been rough.
UA 1543 arrived on time 77% of the time on Tuesdays and just 58% on Mondays. That gap is worth planning around.
A bit behind the EWR–SJU route.
UA 1543 arrived on time 65% of the time, versus 71% across the EWR–SJU route.
Lagging the United Airlines network.
UA 1543 arrived on time 65% of the time, versus 79% across the United Airlines network.
Trending in the right direction.
UA 1543 arrived on time 75% of the time over the last three months in the data, compared with 60% in the three months before that.
The breakdown
- Mon58%(50 flights)
- Tue77%(52 flights)
- Wed63%(51 flights)
- Thu63%(51 flights)
- Fri63%(51 flights)
- Sat64%(52 flights)
- Sun67%(51 flights)
84%
May
Jun 67% → May 84% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 67% | 30 |
| July 2025 | 62% | 29 |
| August 2025 | 61% | 31 |
| September 2025 | 73% | 30 |
| October 2025 | 58% | 31 |
| November 2025 | 52% | 29 |
| December 2025 | 53% | 30 |
| January 2026 | 57% | 30 |
| February 2026 | 69% | 26 |
| March 2026 | 58% | 31 |
| April 2026 | 83% | 30 |
| May 2026 | 84% | 31 |
- Departures on time
- 64%
- Diverted
- 0%
- Flights flown
- 358
- 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.