Seattle (SEA) to Juneau (JNU): On-Time Performance
Data through July 2026
The calendar drives reliability on SEA–JNU. April 2026 flights landed on schedule 90% of the time, but July 2024 dropped to 57% — a gap of 33 points. Across the full period the route averages 74% on-time against a national 78%.
- On-time
- 74%
- arrived <15 min late
- Avg delay
- 13 min
- completed flights
- Cancelled
- 1.2%
- Flights/day
- 4.4
- last 12 months
- Duration
- 2h 36m
- scheduled
- Distance
- 909 mi
Best airline from SEA to JNU
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 78% | 16 min | 0.3% | 322 |
| Alaska Airlines | 74% | 13 min | 1.3% | 3,064 |
Monthly on-time trend
Best time to fly from SEA to JNU
Aim for departures around 7 a.m. (81% on-time); avoid 7 p.m. departures (60%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 73% | 14 min |
| Tuesdaybest | 80% | 11 min |
| Wednesday | 78% | 11 min |
| Thursday | 68% | 17 min |
| Friday | 74% | 15 min |
| Saturday | 75% | 12 min |
| Sunday | 71% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft30%
- Airline operations44%
- National airspace system19%
- Weather8%
Frequently asked questions
- How often are flights from SEA to JNU delayed?
- 26% of SEA–JNU flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 13 minutes.
- Which airline is most reliable from SEA to JNU?
- Delta Air Lines has the best on-time record on this route at 78%, based on 322 flights. 2 airlines flew SEA–JNU frequently enough to compare in this period.
- What is the best time of day to fly from SEA to JNU?
- Departures around 7 a.m. have the best record (81% on-time), while departures around 7 p.m. have the worst (60%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to JNU?
- The scheduled SEA–JNU flight time averages 2h 36m over 909 miles. Actual arrival times vary — flights on this route land 15+ minutes late 26% of the time.
- How often are SEA to JNU flights cancelled?
- 1.2% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from SEA to JNU?
- July 2024 was the roughest month in this dataset, with only 57% of arrivals on time. The best was April 2026 at 90%. If your dates are flexible, that 33-point gap is worth planning around.
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Based on 3,386 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.