70% of JFK → SEA flights arrived on time in June-August 2026 (825 flights). The most reliable was AS 23, on time 83% of the time on this route. Morning flights did best (76%), evening flights worst (60%). New York JFK (JFK): no delay reported. Seattle (SEA): no delay reported.
Best time of day to fly JFK → SEA
| Morning (before noon) | |
| Afternoon (noon-5 PM) | |
| Evening (after 5 PM) |
Flights JFK → SEA, most reliable first
| Flight | Departs | On time on this route | Cancelled |
|---|---|---|---|
| AS 23 Alaska Airlines | 1:00 PM | 2.2% | |
| DL 699 Delta | 7:00 AM | 3.3% | |
| AS 31 Alaska Airlines | 4:29 PM | 6.5% | |
| AS 21 Alaska Airlines | 7:00 AM | 2.2% | |
| DL 1719 Delta | 11:30 AM | 3.3% | |
| DL 688 Delta | 7:35 PM | 4.3% | |
| DL 740 Delta | 4:50 PM | 5.4% | |
| AS 17 Alaska Airlines | 8:23 PM | 3.3% | |
| B6 263 JetBlue | 5:29 PM | 8.7% |
JFK conditions · SEA conditions · SEA → JFK · 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.