Flight OddsIAD → SEA Delta Air Lines
Delta Air Lines · Washington, DC to Seattle, WA · 361 flights, 2025-07-01 to 2026-06-30 · aggregated across 2 flight numbers
On-time arrival
79%
Median delay
-6 min
90th percentile
+47 min
Cancellation rate
1%
How on-time is Delta Air Lines from IAD to SEA?
Across every Delta Air Lines flight number on IAD → SEA (361 flights, 2025-07-01 to 2026-06-30), 79% arrived within 15 minutes of schedule. Median arrival delay -6 min; the worst 10% ran +47 min or later. 1% were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 279 | 79% |
| 16-30 min | 27 | 8% |
| 31-60 min | 23 | 6% |
| 61-120 min | 10 | 3% |
| 2+ hrs | 16 | 5% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 90% | +3 min |
| 2025-08 | 31 | 87% | +21 min |
| 2025-09 | 30 | 90% | -17 min |
| 2025-10 | 31 | 87% | -1 min |
| 2025-11 | 30 | 73% | +25 min |
| 2025-12 | 27 | 48% | +32 min |
| 2026-01 | 29 | 72% | +39 min |
| 2026-02 | 27 | 78% | +7 min |
| 2026-03 | 29 | 45% | +35 min |
| 2026-04 | 29 | 93% | -11 min |
| 2026-05 | 31 | 94% | +2 min |
| 2026-06 | 30 | 80% | +7 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 51 | 90% |
| Tue | 53 | 74% |
| Wed | 50 | 78% |
| Thu | 50 | 68% |
| Fri | 51 | 82% |
| Sat | 49 | 82% |
| Sun | 51 | 76% |
DL flight numbers on IAD → SEA
Related
Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…