Flight OddsSEA → IAD Delta Air Lines
Delta Air Lines · Seattle, WA to Washington, DC · 361 flights, 2025-07-01 to 2026-06-30 · aggregated across 2 flight numbers
On-time arrival
78%
Median delay
-6 min
90th percentile
+60 min
Cancellation rate
1%
How on-time is Delta Air Lines from SEA to IAD?
Across every Delta Air Lines flight number on SEA → IAD (361 flights, 2025-07-01 to 2026-06-30), 78% arrived within 15 minutes of schedule. Median arrival delay -6 min; the worst 10% ran +60 min or later. 1% were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 277 | 78% |
| 16-30 min | 25 | 7% |
| 31-60 min | 19 | 5% |
| 61-120 min | 23 | 6% |
| 2+ hrs | 12 | 3% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 31 | 77% | +2 min |
| 2025-08 | 31 | 74% | +6 min |
| 2025-09 | 30 | 77% | +4 min |
| 2025-10 | 31 | 81% | +33 min |
| 2025-11 | 29 | 83% | +11 min |
| 2025-12 | 28 | 71% | +18 min |
| 2026-01 | 29 | 76% | +22 min |
| 2026-02 | 27 | 78% | +2 min |
| 2026-03 | 30 | 67% | +15 min |
| 2026-04 | 29 | 93% | -1 min |
| 2026-05 | 31 | 87% | -8 min |
| 2026-06 | 30 | 70% | +6 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 51 | 73% |
| Tue | 53 | 75% |
| Wed | 50 | 88% |
| Thu | 50 | 78% |
| Fri | 50 | 76% |
| Sat | 52 | 81% |
| Sun | 50 | 74% |
DL flight numbers on SEA → IAD
Related
Based on US DOT Bureau of Transportation Statistics on-time data. Loading the full breakdown…