Best Time to Fly JNU to SEA: On-Time Stats by Hour & Airline
Juneau International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
1,590 flights were scheduled from Juneau (JNU) to Seattle (SEA) in the last 12 months, and 80.7% of those that flew arrived on time, 3.1 points above the US average of 77.6%.
Delta Air Lines was the most punctual of the 2 airlines on the route at 92.1%, while Alaska Airlines trailed at 79.6%.
November has been the best month (89% on time) and Wednesday the weakest day of the week (79%).
1.8% of flights were cancelled, versus 1.8% nationally.
JNU 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 |
|---|---|---|---|---|
| Delta Air Lines | 92.1% | 125 min | 0.7% | 141 |
| Alaska Airlines | 79.6% | 61 min | 1.9% | 1,449 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly JNU to SEA
On-time arrival % by scheduled departure hour (local time), 3,169 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 1am–2am | 84.6% | 4.4% | 68 |
| 2am–3am | Limited data | 30 | |
| 5am–6am | 90.2% | 2.1% | 377 |
| 6am–7am | 65.8% | 4.7% | 43 |
| 7am–8am | 83.7% | 1.0% | 779 |
| 8am–9am | 82.1% | 2.6% | 195 |
| 11am–12pm | 87.2% | 0.0% | 47 |
| 12pm–1pm | 76.6% | 1.8% | 222 |
| 1pm–2pm | 68.1% | 2.1% | 141 |
| 2pm–3pm | 76.8% | 1.1% | 461 |
| 5pm–6pm | Limited data | 21 | |
| 6pm–7pm | 80.1% | 1.6% | 675 |
| 7pm–8pm | 93.8% | 0.0% | 32 |
| 8pm–9pm | 93.6% | 0.0% | 78 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on JNU 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) | 77.8% | -4.2 pts | 5.3% | 38 |
| Christmas & New Year (Dec 20 - Jan 3) | 78.2% | -3.8 pts | 7.1% | 84 |
| Summer peak (Jun 15 - Aug 15) | 81.0% | -1.0 pts | 0.8% | 867 |
| All other days | 82.0% | — | 1.7% | 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).