Flight OddsUA520 IAH → ORD
United Airlines · Houston, TX to Chicago, IL · 49 flights observed, 2025-07-01 to 2025-08-18 · 925 mi
UA520 covers more than one route in the data window — the stats below are for IAH → ORD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
54%
Median delay
+13 min
90th percentile
+97 min
Cancellation rate
2%
How often is UA520 on time?
Across 49 flights on IAH → ORD from 2025-07-01 to 2025-08-18, UA520 arrived within 15 minutes of schedule 54% of the time. The median arrival delay was +13 min, and the worst 10% of flights arrived +97 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 | 26 | 54% |
| 16-30 min | 4 | 8% |
| 31-60 min | 6 | 13% |
| 61-120 min | 7 | 15% |
| 2+ hrs | 5 | 10% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 55% | +42 min |
| 2025-08 | 17 | 53% | +40 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 7 | 57% |
| Tue | 7 | 43% |
| Wed | 6 | 67% |
| Thu | 7 | 29% |
| Fri | 7 | 43% |
| Sat | 7 | 100% |
| Sun | 7 | 43% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…