Flight OddsUA4637 DEN → TUS
United Airlines · Denver, CO to Tucson, AZ · 69 flights observed, 2025-10-26 to 2026-01-05 · 639 mi
UA4637 covers more than one route in the data window — the stats below are for DEN → TUS, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
87%
Median delay
-15 min
90th percentile
+21 min
Cancellation rate
3%
How often is UA4637 on time?
Across 69 flights on DEN → TUS from 2025-10-26 to 2026-01-05, UA4637 arrived within 15 minutes of schedule 87% of the time. The median arrival delay was -15 min, and the worst 10% of flights arrived +21 min or later. 3% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 58 | 87% |
| 16-30 min | 4 | 6% |
| 31-60 min | 2 | 3% |
| 61-120 min | 3 | 4% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-10 | 6 | 100% | -17 min |
| 2025-11 | 27 | 96% | -12 min |
| 2025-12 | 29 | 76% | -3 min |
| 2026-01 | 5 | 80% | +9 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 11 | 91% |
| Tue | 9 | 100% |
| Wed | 10 | 90% |
| Thu | 9 | 89% |
| Fri | 9 | 67% |
| Sat | 9 | 89% |
| Sun | 10 | 80% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…