Flight OddsUA3531 ORD → MDT
United Airlines · Chicago, IL to Harrisburg, PA · 31 flights observed, 2026-03-29 to 2026-04-28 · 594 mi
UA3531 covers more than one route in the data window — the stats below are for ORD → MDT, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
85%
Median delay
-12 min
90th percentile
+34 min
Cancellation rate
13%
How often is UA3531 on time?
Across 31 flights on ORD → MDT from 2026-03-29 to 2026-04-28, UA3531 arrived within 15 minutes of schedule 85% of the time. The median arrival delay was -12 min, and the worst 10% of flights arrived +34 min or later. 13% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 23 | 85% |
| 16-30 min | 1 | 4% |
| 31-60 min | 1 | 4% |
| 61-120 min | 1 | 4% |
| 2+ hrs | 1 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-03 | 2 | 100% | -14 min |
| 2026-04 | 25 | 84% | +1 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 4 | 75% |
| Tue | 4 | 75% |
| Wed | 4 | 75% |
| Thu | 3 | 100% |
| Fri | 3 | 67% |
| Sat | 4 | 100% |
| Sun | 5 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…