Flight OddsUnited Airlines · San Francisco, CA to Chicago, IL · 139 flights observed, 2026-02-12 to 2026-06-30 · 1,846 mi
UA2278 covers more than one route in the data window — the stats below are for SFO → ORD, the one it has flown most recently. The others are linked under “Other routes”.
How often is UA2278 on time?
Across 139 flights on SFO → ORD from 2026-02-12 to 2026-06-30, UA2278 arrived within 15 minutes of schedule 85% of the time. The median arrival delay was -15 min, and the worst 10% of flights arrived +33 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 | 116 | 85% |
| 16-30 min | 5 | 4% |
| 31-60 min | 6 | 4% |
| 61-120 min | 5 | 4% |
| 2+ hrs | 4 | 3% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-02 | 17 | 100% | -18 min |
| 2026-03 | 30 | 93% | -13 min |
| 2026-04 | 29 | 83% | -11 min |
| 2026-05 | 30 | 80% | +13 min |
| 2026-06 | 30 | 77% | +9 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 19 | 89% |
| Tue | 20 | 95% |
| Wed | 19 | 79% |
| Thu | 20 | 80% |
| Fri | 20 | 80% |
| Sat | 19 | 89% |
| Sun | 19 | 84% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…