Carrier route record
ASJNU→SEA
Alaska Airlines · Juneau to Seattle
- Flights
- 1,450
- Period
- July 2025 to June 2026
- Share of route
- 91%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Alaska Airlines.
Alaska on JNU to SEA lands a B, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 1,450 flights, with a median arrival 5 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate Alaska on JNU to SEA from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
79.1%
Arrivals under 15 minutes late, of 1,419 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
2.07%
National rate is 1.81%
Whole route
80.3%
Every carrier on JNU to SEA, 1,591 flights
These figures cover 1,450 flights between July 2025 and June 2026. The median arrival is 5 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.
Carrier by carrier
Alaska against every carrier on JNU to SEA
Alaska flew 1,450 of the 1,591 flights on JNU to SEA, most of the route. Its 79.1% on time is about level with the route as a whole at 80.3%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from Delta at 92.1% to Alaska at 79.1%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
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 |
|---|---|---|---|---|---|
| Delta Air Linesthin sample | 141 | 92.1% | 122 min | 0.71% | A+ |
| Alaska Airlines (this page) | 1,450 | 79.1% | 59 min | 2.07% | B |
Flight by flight
Alaska flight numbers on JNU to SEA
Departure window
When Alaska runs best on this route
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 1,450 flights.
- 5am–8am505 flights79.6%
- 8am–11am—
- 11am–2pm144 flights77.5%
- 2pm–5pm334 flights76.0%
- 5pm–8pm366 flights81.1%
- 8pm–5am101 flights83.2%
Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is the strongest at 83.2% on time. The full set of windows spans 7 points.
Across the year
Alaska on JNU to SEA through the year
April is the best month on the calendar at 91.1% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. July was the busiest month here, with 186 flights.
Across the week, Sunday is the strongest day at 81.9% on time and Friday the weakest at 76.6%. 5 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Alaska runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 17,000 reported delay minutes.
- 40%Carrier
- 33%Late-arriving aircraft
- 20%National Airspace System
- 6%Extreme weather
- 1%Security
The largest share of delay minutes, 40%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 6,976 of the 17,000 delay minutes reported here. The split is drawn from 17,475 reported delay minutes.
Cancellations sit at 2.07% against a national 1.81%, which is ordinary. Diversions add another 0.07%.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 4.9% land an hour or more behind schedule, against 8.1% 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 909 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg runs 76.3% on time across 1,448 flights, within 3 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,450 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.
What to do with this
Booking Alaska on JNU to SEA
Put together: the calendar is the biggest lever here, not the carrier or the hour. April runs 91.1% on time and March 69.2%, a swing of 22 points. If the dates move at all, move them out of March before you think about anything else. 1,419 completed flights over 12 months sit behind that.
Related
Where to go next
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.