Flight OddsUA311 BOS → LAX
United Airlines · Boston, MA to Los Angeles, CA · 234 flights observed, 2025-07-01 to 2026-03-28 · 2,611 mi
UA311 covers more than one route in the data window — the stats below are for BOS → LAX, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
84%
Median delay
-7 min
90th percentile
+25 min
Cancellation rate
2%
How often is UA311 on time?
Across 234 flights on BOS → LAX from 2025-07-01 to 2026-03-28, UA311 arrived within 15 minutes of schedule 84% of the time. The median arrival delay was -7 min, and the worst 10% of flights arrived +25 min or later. 2% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 193 | 84% |
| 16-30 min | 15 | 7% |
| 31-60 min | 14 | 6% |
| 61-120 min | 6 | 3% |
| 2+ hrs | 1 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 97% | -4 min |
| 2025-08 | 18 | 89% | -5 min |
| 2025-09 | 6 | 100% | -18 min |
| 2025-10 | 31 | 94% | +13 min |
| 2025-11 | 30 | 87% | -4 min |
| 2025-12 | 31 | 68% | +7 min |
| 2026-01 | 29 | 86% | -8 min |
| 2026-02 | 25 | 68% | -3 min |
| 2026-03 | 28 | 82% | -4 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 30 | 80% |
| Tue | 32 | 91% |
| Wed | 33 | 82% |
| Thu | 34 | 85% |
| Fri | 34 | 88% |
| Sat | 33 | 79% |
| Sun | 33 | 85% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…