Flight OddsDL3959 BOI → SEA
Delta Air Lines · Boise, ID to Seattle, WA · 98 flights observed, 2026-01-05 to 2026-04-12 · 399 mi
DL3959 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
94%
Median delay
-21 min
90th percentile
+1 min
Cancellation rate
1%
How often is DL3959 on time?
Across 98 flights on BOI → SEA from 2026-01-05 to 2026-04-12, DL3959 arrived within 15 minutes of schedule 94% of the time. The median arrival delay was -21 min, and the worst 10% of flights arrived +1 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 | 91 | 94% |
| 16-30 min | 1 | 1% |
| 31-60 min | 2 | 2% |
| 61-120 min | 2 | 2% |
| 2+ hrs | 1 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-01 | 27 | 93% | -9 min |
| 2026-02 | 28 | 93% | -20 min |
| 2026-03 | 30 | 93% | -10 min |
| 2026-04 | 12 | 100% | -17 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 14 | 100% |
| Tue | 14 | 86% |
| Wed | 14 | 93% |
| Thu | 14 | 93% |
| Fri | 13 | 100% |
| Sat | 14 | 93% |
| Sun | 14 | 93% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…