Best Time to Fly EWR to SEA: On-Time Stats by Hour & Airline
Newark Liberty International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
2,263 flights were scheduled from Newark (EWR) to Seattle (SEA) in the last 12 months, and 73.6% of those that flew arrived on time, 4.1 points below the US average of 77.6%.
Among 2 airlines, United Airlines led with 76.0% on time and Alaska Airlines was last with 71.7%.
Over 24 months, Tuesday was the most reliable day (79% on time) and December the worst month (63%).
The cancellation rate was 2.2% (US average 1.8%).
EWR to SEA 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 |
|---|---|---|---|---|
| United Airlines | 76.0% | 67 min | 1.5% | 996 |
| Alaska Airlines | 71.7% | 68 min | 2.8% | 1,267 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly EWR to SEA
On-time arrival % by scheduled departure hour (local time), 4,140 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | Limited data | 1 | |
| 7am–8am | 81.1% | 1.0% | 1,074 |
| 8am–9am | 78.5% | 1.3% | 152 |
| 9am–10am | 85.7% | 1.1% | 184 |
| 10am–11am | 84.2% | 0.0% | 146 |
| 11am–12pm | 79.3% | 1.7% | 59 |
| 1pm–2pm | Limited data | 18 | |
| 2pm–3pm | 67.7% | 2.9% | 35 |
| 3pm–4pm | 84.5% | 0.3% | 375 |
| 4pm–5pm | 73.9% | 4.3% | 506 |
| 5pm–6pm | 65.8% | 3.6% | 417 |
| 6pm–7pm | 65.7% | 1.6% | 507 |
| 7pm–8pm | 58.9% | 2.3% | 483 |
| 8pm–9pm | 66.5% | 3.3% | 183 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on EWR to SEA
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) | 79.4% | +3.5 pts | 0.0% | 68 |
| Christmas & New Year (Dec 20 - Jan 3) | 63.2% | -12.7 pts | 1.9% | 155 |
| Summer peak (Jun 15 - Aug 15) | 69.2% | -6.7 pts | 3.4% | 892 |
| All other days | 75.9% | — | 1.6% | 3,025 |
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).