Flight OddsUA639 BOS → LAX
United Airlines · Boston, MA to Los Angeles, CA · 103 flights observed, 2026-03-05 to 2026-06-30 · 2,611 mi
UA639 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
71%
Median delay
0 min
90th percentile
+65 min
Cancellation rate
0%
How often is UA639 on time?
Across 103 flights on BOS → LAX from 2026-03-05 to 2026-06-30, UA639 arrived within 15 minutes of schedule 71% of the time. The median arrival delay was 0 min, and the worst 10% of flights arrived +65 min or later. 0% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 72 | 71% |
| 16-30 min | 8 | 8% |
| 31-60 min | 9 | 9% |
| 61-120 min | 9 | 9% |
| 2+ hrs | 4 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-03 | 16 | 75% | +33 min |
| 2026-04 | 26 | 85% | +9 min |
| 2026-05 | 30 | 70% | +11 min |
| 2026-06 | 30 | 57% | +20 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 17 | 65% |
| Tue | 9 | 78% |
| Wed | 13 | 77% |
| Thu | 17 | 65% |
| Fri | 17 | 71% |
| Sat | 13 | 92% |
| Sun | 16 | 56% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…