Flight OddsDL4090 SEA → BOI
Delta Air Lines · Seattle, WA to Boise, ID · 157 flights observed, 2025-12-20 to 2026-06-28 · 399 mi
DL4090 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
-9 min
90th percentile
+26 min
Cancellation rate
1%
How often is DL4090 on time?
Across 157 flights on SEA → BOI from 2025-12-20 to 2026-06-28, DL4090 arrived within 15 minutes of schedule 88% of the time. The median arrival delay was -9 min, and the worst 10% of flights arrived +26 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 | 137 | 88% |
| 16-30 min | 6 | 4% |
| 31-60 min | 8 | 5% |
| 61-120 min | 2 | 1% |
| 2+ hrs | 3 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-12 | 9 | 89% | +0 min |
| 2026-01 | 24 | 88% | +4 min |
| 2026-02 | 22 | 100% | -12 min |
| 2026-03 | 27 | 81% | +5 min |
| 2026-04 | 26 | 92% | -10 min |
| 2026-05 | 24 | 92% | -5 min |
| 2026-06 | 24 | 75% | +4 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 27 | 96% |
| Tue | 23 | 100% |
| Wed | 20 | 85% |
| Thu | 25 | 84% |
| Fri | 26 | 85% |
| Sat | 9 | 89% |
| Sun | 26 | 77% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…