81% of flights leaving Juneau (JNU) arrived on time over the past 12 months, 5 points better than the national average of 76%. About 13 flights leave JNU on a typical day; 2.1% were cancelled. 83% pushed back from the gate on time, so most of the lateness is already there when the flight leaves the gate.
At a glance
- Best hour to fly: 6 p.m. (84% on time). Worst: 1 p.m. (77%).
- Best month: April (88%). Worst: January (71%).
- Biggest delay cause: late-arriving aircraft (48% of delay minutes).
- Year on year: getting worse (84% → 81%).
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for flights leaving JNU: when a flight was late, it was under 45 minutes late 58% of the time. About 1 in 20 flights landed an hour or more late, and 1 in 92 three hours or more; 2.1% were cancelled outright.
- On time or early81%
- 15–30 min late6.3%
- 30–60 min late4.9%
- 1–2 hours late3.0%
- 2–3 hours late1.0%
- 3+ hours late1.1%
- Diverted0.7%
- Cancelled2.1%
Share of all 4,714 scheduled flights, past 12 months, by arrival time against schedule.
Best time of day to fly out of JNU
JNU is unusually consistent through the day. Flights scheduled to leave at 6 p.m. arrived on time 84% of the time; at 1 p.m. it was 77%, a 6-point gap. Taken together, early departures (5–9 a.m.) ran 83% on time against 81% for the evening bank (5–10 p.m.). Early planes usually start the day at the airport, so they haven't had a chance to pick up delays elsewhere. By evening a late inbound aircraft, a crew running out of duty hours or an afternoon thunderstorm can push one late flight into the next. Cancellations cluster too: 8 p.m. departures were cancelled 4.0% of the time, against 2.1% overall.
Hour × month
Combine the two and the spread is wider still. The most reliable combination at JNU was a 9 a.m. departure in July (92% on time); the least, 9 a.m. in January (66%). If you can only move one thing, move the hour. Departure hour usually shifts the odds more than the month does.
Each cell: on-time rate for that departure hour in that calendar month, 2023–2026. Find your travel month, then look along the row for the greenest hour.
Best and worst months
January is the hardest month at JNU, with 71% of flights on time across 2023–2026; April is the best at 88%. Winter costs 10 points against autumn. Cancellations peak in January (4.2% of flights).
Airlines at JNU
Alaska Airlines runs 97% of departures from JNU, so JNU is effectively its hub. When Alaska Airlines has a bad day, so does the airport.
| Airline | Departures | On time | Left on time | Cancelled | Typical arrival |
|---|---|---|---|---|---|
| Alaska Airlines | 4,573 | 81% | 83% | 2.1% | −9 min |
| Delta Air Lines | 141 | 91% | 92% | 1.4% | −13 min |
Why flights are late at JNU
Airlines report a cause for every flight that arrives 15 or more minutes late. At JNU, 48% of delay minutes came from late-arriving aircraft: the plane showed up late from its previous flight, so the delay started somewhere else. Next is the airlines themselves at 27%. That's why the first flight of the morning is the safest bet: it has no earlier flight to inherit a delay from. Of the 98 cancellations, 57% were blamed on weather.
The average taxi from gate to takeoff is 13 minutes, shorter than at most large U.S. airports.
Month by month
Over the latest 12 months 81% of JNU departures were on time, against 84% in the 12 months before, a decline of 3 points. The best recent month was April 2026 (90%); the worst, December 2025 (61%).
Worst cancellation days
The worst single day in the past year was Sunday, Jan 18, 2026, when 82% of 11 scheduled departures were cancelled. Days like that are usually a major storm, a system outage or a holiday peak hitting bad weather. No average predicts them, so on a stormy forecast, check your airline's travel waivers.
| Date | Departures | Cancelled | On time |
|---|---|---|---|
| Jan 18, 2026 | 11 | 82% | 9% |
| Jan 19, 2026 | 11 | 36% | 27% |
| Dec 30, 2025 | 11 | 27% | 9% |
| Feb 5, 2026 | 11 | 27% | 73% |
| Sep 26, 2025 | 15 | 20% | 60% |
| Dec 7, 2025 | 11 | 18% | 18% |
| Apr 10, 2026 | 11 | 18% | 73% |
| Dec 21, 2025 | 11 | 18% | 64% |
| Dec 8, 2025 | 11 | 18% | 64% |
| Mar 7, 2026 | 11 | 18% | 64% |
Last flights of the day
The last flight of the day is a different bet. Across routes from JNU, each airline's final departure was cancelled 3.0% of the time, against 1.9% for its earlier flights (1.6× as often). Late in the day crews run short on duty hours, aircraft arrive late from elsewhere, and with no later flight to fold passengers into, cancelling is easier for the airline. 0.7% of last flights landed 3+ hours late. The riskiest last flight out was Alaska Airlines to Anchorage (4.1% cancelled).
| Last flight to | Airline | Leaves | Cancelled | 3h+ late | On time |
|---|---|---|---|---|---|
| ANC Anchorage | Alaska Airlines | 9:10 p.m. | 4.1% | 0.8% | 78% |
| SIT Sitka | Alaska Airlines | 10:18 p.m. | 3.3% | 0.0% | 82% |
| SEA Seattle | Alaska Airlines | 8:48 p.m. | 1.6% | 1.4% | 85% |
Each airline's last scheduled departure of the day on a route, on days it flies the route at least twice; past 12 months. Riskiest first.
Tips for flying out of JNU
- Book the earliest departure you can live with. At JNU the 6 p.m. flights do best.
- Traveling in January? Leave extra slack for anything that can't move: cruises, weddings, the last connection of the day.
- Need to arrive tonight? Don't book the last flight out of JNU; the one before it leaves you a backup.
- Delayed already? Most delays at JNU come from late-arriving aircraft. If your inbound plane is late, your flight will be too, whatever the board says.
Routes from JNU
Where you're going matters too. From JNU, the most reliable busy route was to Anchorage (ANC, 82% on time) and the least reliable to Seattle (SEA, 80%). Flights into congested airports inherit their delays: an air traffic program at the destination holds planes on the ground here.
Least reliable first. Routes with at least 365 flights a year.
| To | Flights | On time | Cancelled | Typical arrival |
|---|---|---|---|---|
| SEA Seattle | 1,589 | 80% | 1.8% | −5 min |
| ANC Anchorage | 1,230 | 82% | 2.8% | −11 min |
| SIT Sitka | 725 | 83% | 2.2% | −16 min |
Flights into JNU
Arriving rather than leaving? These are the routes into Juneau, least reliable first. The weakest is from Seattle (78% on time).
| From | Flights | On time | Cancelled |
|---|---|---|---|
| SEA Seattle | 1,588 | 78% | 1.3% |
| SIT Sitka | 725 | 81% | 3.9% |
| ANC Anchorage | 1,230 | 87% | 0.3% |
Questions about JNU delays
What is the best time to fly out of JNU?
Flights scheduled at 6 p.m.: over the past year 84% of JNU departures at that hour arrived on time, against 77% at 1 p.m., the worst hour.
What month has the most flight delays at JNU?
January (71% on time). April is the best month (88%).
Why are flights delayed at JNU?
The biggest cause was late-arriving aircraft (48% of delay minutes): the plane showed up late from its previous flight, so the delay started somewhere else. Then the airlines themselves (27%).
How often are flights cancelled at JNU?
2.1% of scheduled departures over the past 12 months, peaking in January at 4.2%.
Hours are scheduled local departure times. "On time" means arriving less than 15 minutes late at the destination; cancelled and diverted flights count as not on time. Method.