Flight OddsUA277 ONT → SFO
United Airlines · Ontario, CA to San Francisco, CA · 65 flights observed, 2025-07-01 to 2025-12-17 · 363 mi
UA277 covers more than one route in the data window — the stats below are for ONT → SFO, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
89%
Median delay
-7 min
90th percentile
+13 min
Cancellation rate
0%
How often is UA277 on time?
Across 65 flights on ONT → SFO from 2025-07-01 to 2025-12-17, UA277 arrived within 15 minutes of schedule 89% of the time. The median arrival delay was -7 min, and the worst 10% of flights arrived +13 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 | 58 | 89% |
| 16-30 min | 3 | 5% |
| 31-60 min | 1 | 2% |
| 61-120 min | 1 | 2% |
| 2+ hrs | 2 | 3% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 84% | +9 min |
| 2025-08 | 18 | 89% | -3 min |
| 2025-12 | 16 | 100% | -4 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 9 | 89% |
| Tue | 10 | 100% |
| Wed | 10 | 100% |
| Thu | 9 | 78% |
| Fri | 9 | 89% |
| Sat | 9 | 78% |
| Sun | 9 | 89% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…