Flight OddsUnited Airlines · San Francisco, CA to Philadelphia, PA · 36 flights observed, 2025-10-26 to 2025-12-01 · 2,522 mi
UA520 covers more than one route in the data window — the stats below are for SFO → PHL, the one it has flown most recently. The others are linked under “Other routes”.
How often is UA520 on time?
Across 36 flights on SFO → PHL from 2025-10-26 to 2025-12-01, UA520 arrived within 15 minutes of schedule 83% of the time. The median arrival delay was -13 min, and the worst 10% of flights arrived +35 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 | 30 | 83% |
| 16-30 min | 0 | 0% |
| 31-60 min | 4 | 11% |
| 61-120 min | 2 | 6% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-10 | 6 | 50% | +26 min |
| 2025-11 | 29 | 93% | -10 min |
| 2025-12 | 1 | 0% | +35 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 6 | 83% |
| Tue | 5 | 80% |
| Wed | 5 | 100% |
| Thu | 4 | 75% |
| Fri | 5 | 100% |
| Sat | 5 | 80% |
| Sun | 6 | 67% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…