Best Time to Fly SEA to JFK: On-Time Stats by Hour & Airline
Seattle/Tacoma International → John F. Kennedy International
Data through July 2026 · Last updated October 18, 2026
2,906 flights were scheduled from Seattle (SEA) to New York (JFK) in the last 12 months, and 77.4% of those that flew arrived on time, in line with the US average of 77.6%.
Among 3 airlines, Delta Air Lines led with 80.1% on time and JetBlue was last with 74.0%.
Over 24 months, Tuesday was the most reliable day (80% on time) and July the worst month (60%).
The cancellation rate was 2.9% (US average 1.8%).
SEA to JFK on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Lines | 80.1% | 69 min | 3.1% | 1,337 |
| Alaska Airlines | 75.3% | 51 min | 2.6% | 1,403 |
| JetBlue | 74.0% | 139 min | 4.8% | 166 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SEA to JFK
On-time arrival % by scheduled departure hour (local time), 5,771 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 1 | |
| 6am–7am | 92.4% | 0.0% | 92 |
| 7am–8am | 84.4% | 2.4% | 1,142 |
| 8am–9am | 75.6% | 3.5% | 257 |
| 9am–10am | 75.4% | 1.7% | 119 |
| 10am–11am | 72.4% | 2.5% | 197 |
| 11am–12pm | 68.8% | 2.0% | 763 |
| 12pm–1pm | Limited data | 24 | |
| 1pm–2pm | 68.9% | 1.7% | 239 |
| 2pm–3pm | 57.3% | 1.7% | 707 |
| 3pm–4pm | 80.2% | 0.7% | 271 |
| 4pm–5pm | 76.9% | 2.1% | 187 |
| 9pm–10pm | 77.2% | 1.6% | 441 |
| 10pm–11pm | 76.5% | 2.2% | 692 |
| 11pm–12am | 79.3% | 1.4% | 639 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SEA to JFK
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 77.0% | -1.0 pts | 0.0% | 101 |
| Christmas & New Year (Dec 20 - Jan 3) | 78.8% | +0.8 pts | 4.3% | 207 |
| Summer peak (Jun 15 - Aug 15) | 61.9% | -16.1 pts | 3.9% | 1,116 |
| All other days | 78.0% | — | 1.4% | 4,347 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).