Flight OddsDL473 SEA → BOS
Delta Air Lines · Seattle, WA to Boston, MA · 363 flights observed, 2025-07-01 to 2026-06-30 · 2,496 mi
On-time arrival
81%
Median delay
-7 min
90th percentile
+26 min
Cancellation rate
2%
How often is DL473 on time?
Across 363 flights on SEA → BOS from 2025-07-01 to 2026-06-30, DL473 arrived within 15 minutes of schedule 81% of the time. The median arrival delay was -7 min, and the worst 10% of flights arrived +26 min or later. 2% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 287 | 81% |
| 16-30 min | 43 | 12% |
| 31-60 min | 16 | 4% |
| 61-120 min | 8 | 2% |
| 2+ hrs | 2 | 1% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 29 | 76% | +1 min |
| 2025-08 | 31 | 68% | +6 min |
| 2025-09 | 30 | 70% | +10 min |
| 2025-10 | 31 | 90% | -5 min |
| 2025-11 | 28 | 86% | -7 min |
| 2025-12 | 31 | 81% | -11 min |
| 2026-01 | 29 | 76% | -2 min |
| 2026-02 | 27 | 78% | +17 min |
| 2026-03 | 31 | 84% | -11 min |
| 2026-04 | 30 | 77% | +1 min |
| 2026-05 | 31 | 94% | -9 min |
| 2026-06 | 28 | 89% | -7 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 51 | 80% |
| Tue | 50 | 84% |
| Wed | 52 | 87% |
| Thu | 51 | 84% |
| Fri | 51 | 80% |
| Sat | 52 | 71% |
| Sun | 49 | 78% |
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…