Flight OddsDL4127 BOI → SEA
Delta Air Lines · Boise, ID to Seattle, WA · 333 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 BOI → SEA, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
85%
Median delay
-9 min
90th percentile
+31 min
Cancellation rate
1%
How often is DL4127 on time?
Across 333 flights on BOI → SEA from 2025-07-01 to 2026-06-30, DL4127 arrived within 15 minutes of schedule 85% of the time. The median arrival delay was -9 min, and the worst 10% of flights arrived +31 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 | 282 | 85% |
| 16-30 min | 15 | 5% |
| 31-60 min | 20 | 6% |
| 61-120 min | 9 | 3% |
| 2+ hrs | 5 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 84% | +8 min |
| 2025-08 | 31 | 81% | +0 min |
| 2025-09 | 30 | 83% | +1 min |
| 2025-10 | 31 | 87% | -5 min |
| 2025-11 | 28 | 89% | -7 min |
| 2025-12 | 31 | 90% | -5 min |
| 2026-01 | 31 | 84% | +3 min |
| 2026-02 | 28 | 93% | -14 min |
| 2026-03 | 30 | 80% | +15 min |
| 2026-04 | 30 | 97% | -13 min |
| 2026-05 | 6 | 83% | -15 min |
| 2026-06 | 24 | 67% | +11 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 48 | 83% |
| Tue | 49 | 92% |
| Wed | 48 | 83% |
| Thu | 46 | 87% |
| Fri | 46 | 83% |
| Sat | 46 | 91% |
| Sun | 48 | 77% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…