Flight OddsDL438 SEA → BOS
Delta Air Lines · Seattle, WA to Boston, MA · 21 flights observed, 2026-06-07 to 2026-06-27 · 2,496 mi
DL438 covers more than one route in the data window — the stats below are for SEA → BOS, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
76%
Median delay
+1 min
90th percentile
+61 min
Cancellation rate
0%
How often is DL438 on time?
Across 21 flights on SEA → BOS from 2026-06-07 to 2026-06-27, DL438 arrived within 15 minutes of schedule 76% of the time. The median arrival delay was +1 min, and the worst 10% of flights arrived +61 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 | 16 | 76% |
| 16-30 min | 1 | 5% |
| 31-60 min | 1 | 5% |
| 61-120 min | 1 | 5% |
| 2+ hrs | 2 | 10% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-06 | 21 | 76% | +28 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 3 | 67% |
| Tue | 3 | 67% |
| Wed | 3 | 33% |
| Thu | 3 | 67% |
| Fri | 3 | 100% |
| Sat | 3 | 100% |
| Sun | 3 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…