Best Time to Fly SEA to JNU: On-Time Stats by Hour & Airline
Seattle/Tacoma International → Juneau International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 79.2% of Seattle (SEA) to Juneau (JNU) flights arrived on time (1,588 scheduled flights). That is 1.6 points above the national average of 77.6%.
Delta Air Lines was the most punctual of the 2 airlines on the route at 82.9%, while Alaska Airlines trailed at 78.8%.
April has been the best month (83% on time) and Thursday the weakest day of the week (70%).
1.1% of flights were cancelled, versus 1.8% nationally.
SEA to JNU 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 | 82.9% | 46 min | 0.7% | 141 |
| Alaska Airlines | 78.8% | 51 min | 1.2% | 1,447 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SEA to JNU
On-time arrival % by scheduled departure hour (local time), 3,169 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 83.2% | 0.4% | 724 |
| 9am–10am | 76.4% | 1.7% | 241 |
| 10am–11am | Limited data | 28 | |
| 11am–12pm | 69.0% | 0.7% | 602 |
| 1pm–2pm | 83.2% | 0.0% | 226 |
| 3pm–4pm | Limited data | 21 | |
| 4pm–5pm | 78.9% | 0.0% | 175 |
| 5pm–6pm | 84.4% | 0.0% | 96 |
| 6pm–7pm | 74.2% | 3.0% | 132 |
| 7pm–8pm | 59.2% | 0.8% | 240 |
| 8pm–9pm | 81.8% | 2.0% | 197 |
| 9pm–10pm | 79.4% | 2.9% | 140 |
| 10pm–11pm | 63.8% | 3.5% | 255 |
| 11pm–12am | 74.7% | 4.3% | 92 |
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 JNU
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) | 63.9% | -15.0 pts | 2.7% | 37 |
| Christmas & New Year (Dec 20 - Jan 3) | 67.9% | -11.0 pts | 4.7% | 85 |
| Summer peak (Jun 15 - Aug 15) | 68.2% | -10.7 pts | 0.7% | 867 |
| All other days | 78.9% | — | 1.3% | 2,180 |
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).