Flight OddsSEA → BOS Delta Air Lines
Delta Air Lines · Seattle, WA to Boston, MA · 1,005 flights, 2025-07-01 to 2026-06-30 · aggregated across 5 flight numbers
On-time arrival
82%
Median delay
-8 min
90th percentile
+31 min
Cancellation rate
1%
How on-time is Delta Air Lines from SEA to BOS?
Across every Delta Air Lines flight number on SEA → BOS (1,005 flights, 2025-07-01 to 2026-06-30), 82% arrived within 15 minutes of schedule. Median arrival delay -8 min; the worst 10% ran +31 min or later. 1% were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 806 | 82% |
| 16-30 min | 78 | 8% |
| 31-60 min | 46 | 5% |
| 61-120 min | 27 | 3% |
| 2+ hrs | 26 | 3% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 85 | 84% | -3 min |
| 2025-08 | 84 | 79% | +2 min |
| 2025-09 | 77 | 71% | +16 min |
| 2025-10 | 87 | 75% | +12 min |
| 2025-11 | 79 | 80% | +6 min |
| 2025-12 | 72 | 85% | -9 min |
| 2026-01 | 57 | 82% | -4 min |
| 2026-02 | 54 | 83% | +13 min |
| 2026-03 | 83 | 86% | -4 min |
| 2026-04 | 85 | 79% | +10 min |
| 2026-05 | 111 | 95% | -10 min |
| 2026-06 | 109 | 83% | +2 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 143 | 79% |
| Tue | 145 | 86% |
| Wed | 143 | 81% |
| Thu | 149 | 82% |
| Fri | 146 | 84% |
| Sat | 116 | 81% |
| Sun | 141 | 80% |
DL flight numbers on SEA → BOS
Related
Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…