Flight OddsDL3959 SEA → BOI
Delta Air Lines · Seattle, WA to Boise, ID · 141 flights observed, 2026-01-05 to 2026-06-30 · 399 mi
DL3959 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
89%
Median delay
-11 min
90th percentile
+16 min
Cancellation rate
0%
How often is DL3959 on time?
Across 141 flights on SEA → BOI from 2026-01-05 to 2026-06-30, DL3959 arrived within 15 minutes of schedule 89% of the time. The median arrival delay was -11 min, and the worst 10% of flights arrived +16 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 | 126 | 89% |
| 16-30 min | 6 | 4% |
| 31-60 min | 2 | 1% |
| 61-120 min | 4 | 3% |
| 2+ hrs | 3 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-01 | 27 | 93% | -1 min |
| 2026-02 | 28 | 89% | +2 min |
| 2026-03 | 7 | 86% | -1 min |
| 2026-04 | 18 | 89% | 0 min |
| 2026-05 | 31 | 81% | -5 min |
| 2026-06 | 30 | 97% | -13 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 21 | 95% |
| Tue | 21 | 90% |
| Wed | 20 | 90% |
| Thu | 20 | 75% |
| Fri | 20 | 90% |
| Sat | 20 | 100% |
| Sun | 19 | 84% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…