Flight OddsUA2121 SFO → DEN
United Airlines · San Francisco, CA to Denver, CO · 53 flights observed, 2026-03-29 to 2026-05-20 · 967 mi
UA2121 covers more than one route in the data window — the stats below are for SFO → DEN, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
52%
Median delay
+14 min
90th percentile
+33 min
Cancellation rate
0%
How often is UA2121 on time?
Across 53 flights on SFO → DEN from 2026-03-29 to 2026-05-20, UA2121 arrived within 15 minutes of schedule 52% of the time. The median arrival delay was +14 min, and the worst 10% of flights arrived +33 min or later. 0% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 27 | 52% |
| 16-30 min | 16 | 31% |
| 31-60 min | 8 | 15% |
| 61-120 min | 1 | 2% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-03 | 3 | 67% | +3 min |
| 2026-04 | 30 | 50% | +8 min |
| 2026-05 | 19 | 53% | +19 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 8 | 50% |
| Tue | 8 | 25% |
| Wed | 8 | 50% |
| Thu | 7 | 14% |
| Fri | 7 | 71% |
| Sat | 7 | 71% |
| Sun | 7 | 86% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…