Route reliability record
ANC→JNU
Anchorage to Juneau
- Flights
- 1,230
- Period
- September 2025 to August 2026
- Distance
- 571 mi
- Carriers
- 1
This route earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 1,230 ANC to JNU flights, with a median arrival 10 minutes early.
Best time to fly ANC to JNU: a 8am–11am departure, ideally on a Wednesday. Flights in that window arrived on time 90.9% of the time and Wednesday flights 90.3%, against 87.4% for the route overall.
Set against the rest of the country, this route's record is 10 points better than the US average of 77.3%. That gap is worth roughly 101 fewer late arrivals for every thousand flights.
Key figures
On time
87.4%
Arrivals under 15 minutes late, of 1,217 completed flights
Avg delay
61 min
Across delayed arrivals only, not all flights
Cancelled
0.33%
National rate is 1.89%
Best carrier
Alaska
87.4% on time across 1,230 flights
These figures cover 1,230 flights between September 2025 and August 2026. The median arrival is 10 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
Which airline is most reliable on ANC to JNU
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Alaska Airlines | 1,230 | 87.4% | 61 min | 0.33% | A+ |
Flight by flight
Flights on ANC to JNU
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Departure window
The best time of day to leave
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 1,230 flights.
- 5am–8am363 flights89.7%
- 8am–11am121 flights90.9%
- 11am–2pm241 flights84.1%
- 2pm–5pm143 flights87.4%
- 5pm–8pm329 flights85.7%
- 8pm–5am33 flights90.9%
Scale runs 75% to 95%.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 84.1% on time against 90.9% for 8am–11am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 5am–8am window is the busiest, with 363 flights scheduled in it.
Explore
Filter ANC to JNU by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On ANC to JNU, the best departure window is 8am–11am at 90.9% on time and the worst is 11am–2pm at 84.1%, a real gap of 6.8 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am89.7%
- 8–11am90.9%
- 11am–2pm84.1%
- 2–5pm87.4%
- 5–8pm85.7%
- 8pm–5am90.9%
best all US flightsScale 60% to 95%.
Across the year
When delays peak on this route
This route's year swings by 26 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
January is the weak month at 69.3% on time, against 95.5% in April. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. August was the busiest month here, with 124 flights.
Across the week, Wednesday is the strongest day at 90.3% on time and Tuesday the weakest at 83.9%, a spread of 6 points.
Delay causes
Why this route gets delayed
Carrier accounts for 46% of the 9,360 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Carrier
- 24%Late-arriving aircraft
- 21%Extreme weather
- 9%National Airspace System
Extreme weather accounts for 21% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 3.4 times the usual weather exposure. The split is drawn from 9,360 reported delay minutes.
The largest share of delay minutes, 46%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,292 of the 9,360 delay minutes reported here.
Cancellations are rare at 0.33%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 4.0% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 571 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg is a different operation and performs like one: it runs 84.2% on time across 1,230 flights, 3 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 3 points of difference.
The sample behind these figures is 1,230 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in JNU after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. April runs 95.5% on time and January 69.3%, a swing of 26 points. If the dates move at all, move them out of January before you think about anything else. 1,217 completed flights over 12 months sit behind that.
Common questions
ANC to JNU questions
How often is ANC to JNU delayed?
About one flight in eight arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 12.6% of the 1,230 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
How reliable is ANC to JNU compared with the rest of the country?
87.4% of flights arrive on time here against a national 77.3%, a difference of 10 points in its favour. That is worth a A+ on this site's grading scale.
What time of day has the fewest delays on ANC to JNU?
The 8am–11am departure window is the strongest at 90.9% on time. The 11am–2pm window is the weakest at 84.1%, 7 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are January delays on ANC to JNU?
January is the weakest month at 69.3% on time, compared with 95.5% in April. Across the year that is 26 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- JNU to ANC — the return legseparate record
- ANC to SEA, a related route86.9%
- SEA to JNU, a related route79.2%
- ANC to FAI, a related route88.6%
- Alaska Airlines on-time record87.4%
- Worst months to fly in the US, ranked by the data
- Late aircraft, weather, or the airline: what actually causes US flight delays
Direction matters. ANC to JNU and JNU to ANC are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.