What is the best time of day to fly out of Juneau?

Before 6am. Departures in that band left on time 93.8% of the time across 884 flights, July 2023 through June 2026 — the best of the ten bands in the day. The 2–4pm band was the weakest at 79.2%.

What is the worst month to fly out of JNU?

January: 77.3% of the departures that flew left on time, with 1,001 scheduled. October was the other end of the year at 90.5%. Each figure pools three years of that calendar month.

Which airline is most on time at JNU?

Delta Air Lines — 92.2% of its 441 departures from JNU left on time. Alaska Airlines sat at the other end at 86.2% over 13,690 flights. Only airlines with at least 100 departures here are ranked.

How often are flights cancelled at JNU?

1.8% of scheduled departures were cancelled over July 2023 through June 2026. Cancellations are counted against everything scheduled, not against everything that flew — a rate that looks small still adds up to real people in a rebooking line.

Best time to fly out of Juneau (JNU)

Name: Departure on-time record for Juneau International Airport (JNU)
Creator: Bureau of Transportation Statistics
License: https://www.usa.gov/government-works

The early-flight folk wisdom holds up at Juneau: departures in the Before 6am band left on time 93.8% of the time, against 79.2% in the 2–4pm band. These are historical odds, not forecasts. The records say what happened on this schedule over three years; they know nothing about tomorrow’s thunderstorm.

Data through June 2026 · Bureau of Transportation Statistics

On-time rate by hour and day

On this page, “on time” means a departure that pushed back less than 15 minutes behind its scheduled time — the Bureau of Transportation Statistics definition, and the one airlines are held to.

Share of departures that left on time, by hour band and day of week.
Departure time	Mon	Tue	Wed	Thu	Fri	Sat	Sun
Before 6am	92	89	97	95	93	95	96
6–8am	89	89	92	92	93	91	91
8–10am	82	84	85	87	88	86	87
10am–12pm	89	88	81	80	90	84	86
12–2pm	77	80	81	81	78	84	84
2–4pm	78	84	76	81	74	79	84
4–6pm	–	–	–	–	–	–	–
6–8pm	93	91	84	85	85	83	88
8–10pm	83	87	84	85	87	89	88
10pm–12am	81	91	87	75	87	87	85

fewer left on time more left on time

The steadiest stretch at JNU was Before 6am — 93.8% of departures left on time across 884 flights. The weakest was 2–4pm at 79.2%. 6–8am departures from JNU left on time 91% of the time across 3,037 flights; 6–8pm departures, 86.9% across 1,132. That is a gap of 4.1 points, and it is the whole case for the early flight.

The year at JNU

January was the hard month at JNU: 77.3% of departures left on time, across 1,001 flights. October was the easy one at 90.5%. Each month pools three years of that month, so a single bad week does not decide it.

Share of departures that left on time, by calendar month. Best month in green, worst in amber. The hairline sits at the overall rate, 86.4%.

Departure on-time share at JNU by calendar month
Month	Share departures that left on time	Flights
January	77.3%	1,001
February	88.1%	935
March	85.8%	1,023
April	90.4%	1,005
May	88.6%	1,186
June	87.2%	1,462
July	84.7%	1,573
August	84.8%	1,540
September	89.1%	1,318
October	90.5%	1,120
November	89.1%	973
December	80.4%	995

Airlines at JNU

Every airline with at least 100 departures from JNU, busiest first. These are that airline’s departures from this airport only — its record across the country sits on its own page.

Airline	Left on time	Typical delay	Cancelled	Departures
Alaska Airlines	86.2%	68 min	1.9%	13,690
Delta Air Lines	92.2%	129 min	0.7%	441

What delays out of JNU were put down to

Airlines file a reason with every arrival running 15 minutes late or more. Across 2,132 flights that departed JNU and ran 15 minutes late or more, the delay minutes break down with 45.8% put down to late-arriving aircraft and 31.1% to airline operations.

Late-arriving aircraft 45.8%
Airline operations 31.1%
Air traffic & airport volume 14.8%
Severe weather 8%
Security 0.3%

Late-arriving aircraft is the knock-on category: the plane came in late, so it went out late again. It is why a 7am problem in Newark is still a problem in Denver at dinnertime, and why it is usually the biggest slice on the bar.

If you are connecting through JNU

Of 14,131 scheduled arrivals into JNU, 81% reached the gate less than 15 minutes behind schedule. Of the 2,371 arrivals that ran late, 64% were no more than 45 minutes behind — which is the difference between a tight connection and a new boarding pass.

Work out a specific layover — pick the airport and the minutes you have, and the tool reads the same arrival records back as a share.

Busiest routes out of JNU

Ranked by flights, with the share that arrived on time at the far end. Where a route carries enough flights for a page of its own the chip goes there; otherwise it goes to the destination airport.

SEA 82.6% on time · 4,779 flights
ANC 86.1% on time · 3,666 flights
SIT 85.7% on time · 2,181 flights
PSG 81.8% on time · 1,087 flights
KTN 89.3% on time · 1,086 flights
YAK 83.3% on time · 1,086 flights
GST 87.2% on time · 246 flights

Juneau (JNU)

Rank 143 of 363 US airports by departures. Steadiest stretch of the day: Before 6am. Hardest month: January.

July 2023–June 2026 · 13,871 departures flown

86.4% of departures left on time

Questions about JNU

What is the best time of day to fly out of Juneau?: Before 6am. Departures in that band left on time 93.8% of the time across 884 flights, July 2023 through June 2026 — the best of the ten bands in the day. The 2–4pm band was the weakest at 79.2%.
Is the early flight out of JNU really more reliable?: 6–8am departures from JNU left on time 91% of the time across 3,037 flights; 6–8pm departures, 86.9% across 1,132. That is a gap of 4.1 points, and it is the whole case for the early flight.
What is the worst month to fly out of JNU?: January: 77.3% of the departures that flew left on time, with 1,001 scheduled. October was the other end of the year at 90.5%. Each figure pools three years of that calendar month.
Which airline is most on time at JNU?: Delta Air Lines — 92.2% of its 441 departures from JNU left on time. Alaska Airlines sat at the other end at 86.2% over 13,690 flights. Only airlines with at least 100 departures here are ranked.
How often are flights cancelled at JNU?: 1.8% of scheduled departures were cancelled over July 2023 through June 2026. Cancellations are counted against everything scheduled, not against everything that flew — a rate that looks small still adds up to real people in a rebooking line.