Flight OddsDL474 SEA → BOS
Delta Air Lines · Seattle, WA to Boston, MA · 225 flights observed, 2025-07-01 to 2026-06-30 · 2,496 mi
DL474 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
72%
Median delay
0 min
90th percentile
+51 min
Cancellation rate
1%
How often is DL474 on time?
Across 225 flights on SEA → BOS from 2025-07-01 to 2026-06-30, DL474 arrived within 15 minutes of schedule 72% of the time. The median arrival delay was 0 min, and the worst 10% of flights arrived +51 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 | 158 | 72% |
| 16-30 min | 22 | 10% |
| 31-60 min | 19 | 9% |
| 61-120 min | 8 | 4% |
| 2+ hrs | 12 | 5% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 26 | 77% | +9 min |
| 2025-08 | 22 | 73% | +15 min |
| 2025-09 | 17 | 59% | +32 min |
| 2025-10 | 25 | 64% | +26 min |
| 2025-11 | 22 | 64% | +41 min |
| 2025-12 | 11 | 82% | +12 min |
| 2026-03 | 21 | 76% | +17 min |
| 2026-04 | 26 | 73% | +20 min |
| 2026-05 | 25 | 96% | -12 min |
| 2026-06 | 24 | 58% | +14 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 37 | 68% |
| Tue | 35 | 86% |
| Wed | 33 | 73% |
| Thu | 38 | 66% |
| Fri | 36 | 78% |
| Sat | 5 | 100% |
| Sun | 35 | 60% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…