Route reliability record
SIT→JNU
Sitka to Juneau
- Flights
- 725
- Period
- September 2025 to August 2026
- Distance
- 95 mi
- Carriers
- 1
This route earns a B−. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 725 SIT to JNU flights, with a median arrival 13 minutes early.
Set against the rest of the country, this route's record is 8 points better than the US average of 77.3%. That gap is worth roughly 76 fewer late arrivals for every thousand flights.
Key figures
On time
84.9%
Arrivals under 15 minutes late, of 690 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
3.86%
National rate is 1.89%
Best carrier
Alaska
84.9% on time across 725 flights
These figures cover 725 flights between September 2025 and August 2026. The median arrival is 13 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 SIT 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 | 725 | 84.9% | 62 min | 3.86% | B− |
Flight by flight
Flights on SIT 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.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 11 points, against half a point between the best and worst carrier.
- 5am–8am362 flights90.2%
- 8am–11am—
- 11am–2pm1 flights—
- 2pm–5pm—
- 5pm–8pm362 flights79.5%
- 8pm–5am—
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 90.2% of the time, against 79.5% for the evening window. That is 11 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 362 flights scheduled in it.
Explore
Filter SIT 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 SIT to JNU, the best departure window is 5am–8am at 90.2% on time and the worst is 5pm–8pm at 79.5%, a wide gap of 10.7 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am90.2%
- 8–11am—
- 11am–2pm—
- 2–5pm—
- 5–8pm79.5%
- 8pm–5am—
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 31 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.
December is the weak month at 67.9% on time, against 98.4% in July. 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. March was the busiest month here, with 62 flights.
Across the week, Thursday is the strongest day at 89.4% on time and Friday the weakest at 82.3%, a spread of 7 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 58% of the 6,473 delay minutes carriers reported here, and the remaining four split what is left.
- 58%Late-arriving aircraft
- 17%Carrier
- 13%Extreme weather
- 12%National Airspace System
Extreme weather accounts for 13% 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 2.2 times the usual weather exposure. The split is drawn from 6,473 reported delay minutes.
58% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,473 reported delay minutes here, that single category outweighs weather by 4 to one.
Cancellations run at 3.86%, against 1.89% nationally. That is about one flight in 25 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here actually costs
5.9% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
At 95 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.
The return leg runs 85.0% on time across 725 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 725 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
Work out the risk of missing a connection in JNU after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 3.86% cancellation rate. A late arrival costs you about an hour; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 690 completed flights over 12 months sit behind that.
Common questions
SIT to JNU questions
How often is SIT to JNU delayed?
About one flight in seven arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 15.1% of the 725 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
How reliable is SIT to JNU compared with the rest of the country?
84.9% of flights arrive on time here against a national 77.3%, a difference of 8 points in its favour. That is worth a B− on this site's grading scale.
What time of day has the fewest delays on SIT to JNU?
The 5am–8am departure window is the strongest at 90.2% on time. The 5pm–8pm window is the weakest at 79.5%, 11 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 December delays on SIT to JNU?
December is the weakest month at 67.9% on time, compared with 98.4% in July. Across the year that is 31 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 SIT — the return legseparate record
- SEA to JNU, a related route79.2%
- ANC to JNU, a related route87.4%
- JNU to SEA, a related route81.4%
- Alaska Airlines on-time record84.9%
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Direction matters. SIT to JNU and JNU to SIT are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Embed SIT to JNU’s on-time badge on your site
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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.