73% of ATL → SEA flights arrived on time in June-August 2026 (986 flights). The most reliable was AS 377, on time 92% of the time on this route. Morning flights did best (82%), evening flights worst (60%). Atlanta (ATL): no delay reported. Seattle (SEA): no delay reported.
Best time of day to fly ATL → SEA
| Morning (before noon) | |
| Afternoon (noon-5 PM) | |
| Evening (after 5 PM) |
Flights ATL → SEA, most reliable first
| Flight | Departs | On time on this route | Cancelled |
|---|---|---|---|
| AS 377 Alaska Airlines | 7:00 AM | 1.3% | |
| DL 774 Delta | 9:50 AM | 0% | |
| DL 629 Delta | 12:35 PM | 1.1% | |
| AS 348 Alaska Airlines | 8:54 AM | 0% | |
| DL 903 Delta | 9:35 PM | 3.3% | |
| DL 648 Delta | 11:10 AM | 0% | |
| DL 444 Delta | 7:40 AM | 0% | |
| DL 481 Delta | 2:32 PM | 0% | |
| AS 218 Alaska Airlines | 4:18 PM | 1.2% | |
| DL 472 Delta | 4:45 PM | 1.1% | |
| DL 834 Delta | 7:22 PM | 0% | |
| DL 714 Delta | 6:25 PM | 0% |
ATL conditions · SEA conditions · SEA → ATL · 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.