Flight OddsUA1218 SEA → DEN
United Airlines · Seattle, WA to Denver, CO · 191 flights observed, 2025-07-01 to 2026-06-29 · 1,024 mi
UA1218 covers more than one route in the data window — the stats below are for SEA → DEN, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
85%
Median delay
-16 min
90th percentile
+33 min
Cancellation rate
1%
How often is UA1218 on time?
Across 191 flights on SEA → DEN from 2025-07-01 to 2026-06-29, UA1218 arrived within 15 minutes of schedule 85% of the time. The median arrival delay was -16 min, and the worst 10% of flights arrived +33 min or later. 1% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 162 | 85% |
| 16-30 min | 6 | 3% |
| 31-60 min | 12 | 6% |
| 61-120 min | 5 | 3% |
| 2+ hrs | 5 | 3% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 29 | 83% | -1 min |
| 2025-08 | 8 | 75% | +8 min |
| 2025-09 | 21 | 86% | -2 min |
| 2025-10 | 22 | 86% | -11 min |
| 2025-11 | 22 | 86% | -2 min |
| 2025-12 | 1 | 100% | -21 min |
| 2026-02 | 11 | 100% | -11 min |
| 2026-03 | 16 | 81% | +10 min |
| 2026-04 | 18 | 94% | -25 min |
| 2026-05 | 21 | 76% | +4 min |
| 2026-06 | 21 | 86% | -5 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 28 | 75% |
| Tue | 6 | 100% |
| Wed | 39 | 95% |
| Thu | 39 | 85% |
| Fri | 36 | 81% |
| Sat | 5 | 100% |
| Sun | 37 | 84% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…