Flight OddsUA1977 IAH → BOS
United Airlines · Houston, TX to Boston, MA · 362 flights observed, 2025-07-01 to 2026-06-30 · 1,597 mi
On-time arrival
95%
Median delay
-10 min
90th percentile
+5 min
Cancellation rate
1%
How often is UA1977 on time?
Across 362 flights on IAH → BOS from 2025-07-01 to 2026-06-30, UA1977 arrived within 15 minutes of schedule 95% of the time. The median arrival delay was -10 min, and the worst 10% of flights arrived +5 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 | 341 | 95% |
| 16-30 min | 7 | 2% |
| 31-60 min | 3 | 1% |
| 61-120 min | 5 | 1% |
| 2+ hrs | 3 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 97% | -8 min |
| 2025-08 | 31 | 100% | -9 min |
| 2025-09 | 30 | 93% | -4 min |
| 2025-10 | 31 | 90% | -6 min |
| 2025-11 | 29 | 97% | -6 min |
| 2025-12 | 31 | 97% | -10 min |
| 2026-01 | 30 | 87% | -9 min |
| 2026-02 | 25 | 96% | -5 min |
| 2026-03 | 31 | 100% | -10 min |
| 2026-04 | 30 | 97% | +2 min |
| 2026-05 | 31 | 90% | -7 min |
| 2026-06 | 29 | 97% | -13 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 50 | 98% |
| Tue | 52 | 90% |
| Wed | 51 | 94% |
| Thu | 52 | 94% |
| Fri | 51 | 100% |
| Sat | 51 | 90% |
| Sun | 52 | 98% |
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…