Carrier route record
ASJNU→SEA
Alaska Airlines · Juneau to Seattle
- Flights
- 1,448
- Period
- September 2025 to August 2026
- Share of route
- 91%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Alaska Airlines.
Alaska on JNU to SEA lands a B, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 1,448 flights, with a median arrival 5 minutes early.
The US average over the same twelve months is 77.3%, 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
80.4%
Arrivals under 15 minutes late, of 1,421 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
1.86%
National rate is 1.89%
Whole route
81.4%
Every carrier on JNU to SEA, 1,589 flights
These figures cover 1,448 flights between September 2025 and August 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.
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Carrier by carrier
Alaska against every carrier on JNU to SEA
Alaska flew 1,448 of the 1,589 flights on JNU to SEA, most of the route. Its 80.4% on time is about level with the route as a whole at 81.4%. 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 80.4%. 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% | 114 min | 1.42% | A |
| Alaska Airlines (this page) | 1,448 | 80.4% | 58 min | 1.86% | B |
Flight by flight
Alaska flight numbers on JNU to SEA
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
When Alaska runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 20 points, against half a point between the best and worst carrier.
- 5am–8am505 flights80.2%
- 8am–11am—
- 11am–2pm144 flights70.4%
- 2pm–5pm334 flights77.8%
- 5pm–8pm366 flights84.2%
- 8pm–5am99 flights90.6%
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 70.4% on time against 90.6% for 8pm–5am. 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 505 flights scheduled in it.
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 185 flights.
Across the week, Friday is the strongest day at 83.2% on time and Tuesday the weakest at 77.7%, a spread of 6 points.
Arrival by arrival
How late Alaska on JNU to SEA runs when it is late
Alaska on JNU to SEA often beats the schedule: 389 of 1,421 completed flights, 27%, arrived 15 minutes or more early. The 279 late arrivals split 127 under half an hour, 84 between 30 and 60 minutes, and 68 an hour or more.
- 15+ min early389 flights27.4%
- Within 15 min753 flights53.0%
- 15–29 min late127 flights8.9%
- 30–59 min late84 flights5.9%
- 1–2 hours late39 flights2.7%
- 2+ hours late29 flights2.0%
Scale runs 0% to 100%.
Share of 1,421 completed flights by arrival against schedule.
32 of 224 late departures made up the time and arrived on time, 14% of them. In the other direction, 87 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SEA.
The worst days
Worst days for Alaska on JNU to SEA
The latest arrival of the period was on 22 January 2026, 9 hours 16 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 22 January 2026 | 9 hours 16 minutes | Carrier |
| 1 February 2026 | 7 hours 1 minute | Carrier |
| 31 January 2026 | 6 hours 37 minutes | Late-arriving aircraft |
| 13 March 2026 | 6 hours 18 minutes | Extreme weather |
| 3 June 2026 | 6 hours 17 minutes | Carrier |
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 16,000 reported delay minutes.
- 38%Carrier
- 35%Late-arriving aircraft
- 19%National Airspace System
- 7%Extreme weather
- 1%Security
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 16,000 reported delay minutes here, that single category outweighs weather by 5 to one. The split is drawn from 16,300 reported delay minutes.
The largest share of delay minutes, 38%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 6,238 of the 16,000 delay minutes reported here.
Cancellations sit at 1.86% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 4.8% 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 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.
The return leg runs 78.7% on time across 1,447 flights, within 2 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 1,448 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. 1,421 completed flights over 12 months sit behind that.
Related
Where to go next
- JNU to SEA, every carrier
- Alaska on SEA to JNU, the return leg
- Delta Air Lines on JNU to SEA92.1%
- Alaska Airlines network-wide record
- Seattle-Tacoma International (SEA) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.