Flight OddsDL4127 SEA → BOI
Delta Air Lines · Seattle, WA to Boise, ID · 365 flights observed, 2025-07-01 to 2026-06-30 · 399 mi
DL4127 covers more than one route in the data window — the stats below are for SEA → BOI, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
88%
Median delay
-6 min
90th percentile
+21 min
Cancellation rate
0%
How often is DL4127 on time?
Across 365 flights on SEA → BOI from 2025-07-01 to 2026-06-30, DL4127 arrived within 15 minutes of schedule 88% of the time. The median arrival delay was -6 min, and the worst 10% of flights arrived +21 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 | 322 | 88% |
| 16-30 min | 14 | 4% |
| 31-60 min | 14 | 4% |
| 61-120 min | 9 | 2% |
| 2+ hrs | 5 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 81% | +12 min |
| 2025-08 | 31 | 84% | +3 min |
| 2025-09 | 30 | 90% | +1 min |
| 2025-10 | 31 | 94% | -9 min |
| 2025-11 | 29 | 86% | -3 min |
| 2025-12 | 31 | 97% | -4 min |
| 2026-01 | 31 | 87% | +6 min |
| 2026-02 | 28 | 86% | +1 min |
| 2026-03 | 31 | 84% | +17 min |
| 2026-04 | 30 | 100% | -6 min |
| 2026-05 | 31 | 94% | -3 min |
| 2026-06 | 30 | 80% | +3 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 52 | 90% |
| Tue | 53 | 94% |
| Wed | 52 | 83% |
| Thu | 52 | 87% |
| Fri | 52 | 88% |
| Sat | 51 | 96% |
| Sun | 52 | 81% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…