Flight OddsUA2021 IAD → SJU
United Airlines · Washington, DC to San Juan, PR · 347 flights observed, 2025-07-01 to 2026-06-30 · 1,572 mi
On-time arrival
87%
Median delay
-7 min
90th percentile
+23 min
Cancellation rate
1%
How often is UA2021 on time?
Across 347 flights on IAD → SJU from 2025-07-01 to 2026-06-30, UA2021 arrived within 15 minutes of schedule 87% of the time. The median arrival delay was -7 min, and the worst 10% of flights arrived +23 min or later. 1% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 301 | 87% |
| 16-30 min | 19 | 6% |
| 31-60 min | 15 | 4% |
| 61-120 min | 7 | 2% |
| 2+ hrs | 3 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 84% | +4 min |
| 2025-08 | 31 | 74% | +4 min |
| 2025-09 | 13 | 77% | -6 min |
| 2025-10 | 31 | 94% | -9 min |
| 2025-11 | 30 | 87% | +9 min |
| 2025-12 | 31 | 81% | +3 min |
| 2026-01 | 29 | 86% | +5 min |
| 2026-02 | 27 | 89% | -2 min |
| 2026-03 | 31 | 90% | -5 min |
| 2026-04 | 30 | 90% | -9 min |
| 2026-05 | 31 | 100% | -14 min |
| 2026-06 | 30 | 90% | -8 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 49 | 84% |
| Tue | 49 | 90% |
| Wed | 47 | 96% |
| Thu | 49 | 90% |
| Fri | 49 | 84% |
| Sat | 51 | 84% |
| Sun | 51 | 84% |
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…