UA688
United Airlines flight 688 — Washington (IAD) to Boston (BOS)
On time
70%
Avg delay
~73 min
Cancelled
2.0%
UA688 is fairly reliable, though delays happen. About 70% of departures arrive on time. When delays happen, the most common cause is air traffic / NAS.
Monthly breakdown
| Month | On time | Cancelled | Avg delay |
|---|---|---|---|
| 2026-07 | 67% | 3.2% | 116 min |
| 2026-07 | 93% | 3.2% | 60 min |
| 2026-06 | 55% | 3.3% | 77 min |
| 2026-06 | 83% | 0.0% | 497 min |
| 2026-06 | 92% | 0.0% | 18 min |
| 2026-05 | 65% | 0.0% | 109 min |
| 2026-05 | 95% | 0.0% | 20 min |
| 2026-05 | 100% | 0.0% | 0 min |
| 2026-04 | 60% | 0.0% | 81 min |
| 2026-04 | 90% | 0.0% | 55 min |
| 2026-03 | 72% | 6.5% | 69 min |
| 2026-03 | 100% | 0.0% | 0 min |
Top delay cause
air traffic / NAS
Based on 1,970 tracked departures
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Get a free briefingData last updated October 2026. Source: Bureau of Transportation Statistics.