Flight OddsBOS → ORD United Airlines
United Airlines · Boston, MA to Chicago, IL · 2,678 flights, 2025-07-01 to 2026-06-30 · aggregated across 40 flight numbers
On-time arrival
76%
Median delay
-4 min
90th percentile
+58 min
Cancellation rate
2%
How on-time is United Airlines from BOS to ORD?
Across every United Airlines flight number on BOS → ORD (2,678 flights, 2025-07-01 to 2026-06-30), 76% arrived within 15 minutes of schedule. Median arrival delay -4 min; the worst 10% ran +58 min or later. 2% were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 1,983 | 76% |
| 16-30 min | 202 | 8% |
| 31-60 min | 178 | 7% |
| 61-120 min | 118 | 5% |
| 2+ hrs | 136 | 5% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 243 | 67% | +30 min |
| 2025-08 | 241 | 76% | +11 min |
| 2025-09 | 239 | 68% | +19 min |
| 2025-10 | 250 | 69% | +14 min |
| 2025-11 | 224 | 74% | +19 min |
| 2025-12 | 177 | 79% | +15 min |
| 2026-01 | 158 | 72% | +10 min |
| 2026-02 | 140 | 86% | -7 min |
| 2026-03 | 188 | 75% | +29 min |
| 2026-04 | 205 | 84% | +4 min |
| 2026-05 | 268 | 84% | +6 min |
| 2026-06 | 284 | 80% | +12 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 405 | 74% |
| Tue | 343 | 82% |
| Wed | 343 | 78% |
| Thu | 412 | 76% |
| Fri | 409 | 76% |
| Sat | 296 | 78% |
| Sun | 409 | 69% |
UA flight numbers on BOS → ORD
Related
Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…