74% of SEA → JFK flights arrived on time in June-August 2026 (811 flights). The most reliable was AS 26, on time 95% of the time on this route. Morning flights did best (82%), afternoon flights worst (52%). Seattle (SEA): no delay reported. New York JFK (JFK): no delay reported.
Best time of day to fly SEA → JFK
| Morning (before noon) | |
| Afternoon (noon-5 PM) | |
| Evening (after 5 PM) |
Flights SEA → JFK, most reliable first
| Flight | Departs | On time on this route | Cancelled |
|---|---|---|---|
| AS 26 Alaska Airlines | 7:00 AM | 3.3% | |
| DL 429 Delta | 7:15 AM | 3.3% | |
| AS 22 Alaska Airlines | 11:15 PM | 0% | |
| DL 452 Delta | 10:40 PM | 4.3% | |
| AS 34 Alaska Airlines | 9:29 AM | 4.3% | |
| DL 415 Delta | 11:34 AM | 3.3% | |
| AS 16 Alaska Airlines | 2:02 PM | 3.7% | |
| B6 264 JetBlue | 10:19 PM | 12% | |
| DL 461 Delta | 4:00 PM | 4.3% |
SEA conditions · JFK conditions · JFK → SEA · 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.