78% of DTW → SEA flights arrived on time in June-August 2026 (627 flights). The most reliable was DL 814, on time 90% of the time on this route. Detroit (DTW): no delay reported. Seattle (SEA): no delay reported.
Best time of day to fly DTW → SEA
| Morning (before noon) | |
| Afternoon (noon-5 PM) | |
| Evening (after 5 PM) |
Flights DTW → SEA, most reliable first
| Flight | Departs | On time on this route | Cancelled |
|---|---|---|---|
| DL 814 Delta | 6:00 AM | 0% | |
| DL 728 Delta | 12:31 PM | 0% | |
| AS 313 Alaska Airlines | 5:31 PM | 0.5% | |
| AS 344 Alaska Airlines | 7:01 AM | 0% | |
| DL 734 Delta | 8:30 AM | 1.1% | |
| DL 944 Delta | 4:46 PM | 0% | |
| DL 565 Delta | 8:34 PM | 1.1% |
DTW conditions · SEA conditions · SEA → DTW · Cancellations
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From BTS on-time data, June-August 2026; flights with 20+ trips on this route. On-time rates cover each flight number's whole day, which can include other legs. Departure times are local.