UA343
United Airlines flight 343 — Chicago (ORD) to San Francisco (SFO)
On time
82%
Avg delay
~74 min
Cancelled
1.3%
UA343 is a reliable flight. About 82% of departures arrive on time. When delays happen, the most common cause is airline operations.
Monthly breakdown
| Month | On time | Cancelled | Avg delay |
|---|---|---|---|
| 2026-07 | 87% | 0.0% | 116 min |
| 2026-06 | 72% | 3.3% | 69 min |
| 2026-05 | 80% | 9.1% | 54 min |
| 2026-05 | 55% | 0.0% | 72 min |
| 2026-04 | 45% | 3.3% | 85 min |
| 2026-03 | 67% | 0.0% | 334 min |
| 2026-03 | 93% | 0.0% | 40 min |
| 2026-02 | 92% | 0.0% | 127 min |
| 2026-02 | 71% | 0.0% | 27 min |
| 2026-01 | 83% | 0.0% | 29 min |
| 2026-01 | 89% | 0.0% | 45 min |
| 2025-12 | 94% | 0.0% | 17 min |
Top delay cause
airline operations
Based on 1,805 tracked departures
Flying UA343? Get a free briefing.
Weather, delays, and what to expect — sent to your inbox before your flight.
Get a free briefingData last updated October 2026. Source: Bureau of Transportation Statistics.