Carrier route record

DLJNU→SEA

Delta Air Lines · Juneau to Seattle

Flights: 141
Period: July 2025 to June 2026
Share of route: 9%
Carriers: 2

Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Delta Air Lines.

Delta on JNU to SEA 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 15 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 141 flights, with a median arrival 12 minutes early.

Set against the rest of the country, Delta's JNU to SEA record is 15 points better than the US average of 77.6%. That gap is worth roughly 145 fewer late arrivals for every thousand flights.

On time

92.1%

Arrivals under 15 minutes late, of 140 completed flights

Avg delay

122 min

Across delayed arrivals only, not all flights

Cancelled

0.71%

National rate is 1.81%

Whole route

80.3%

Every carrier on JNU to SEA, 1,591 flights

These figures cover 141 flights between July 2025 and June 2026. The median arrival is 12 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

Delta against every carrier on JNU to SEA

Delta flew 141 of the 1,591 flights on JNU to SEA, about 9% of it. Its 92.1% on time is 12 points better than the route as a whole, which runs 80.3%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from Delta at 92.1% to Alaska at 79.1%.

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.

On-time performance by carrier on JNU to SEA
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines (this page)thin sample	141	92.1%	122 min	0.71%	A+
Alaska Airlines	1,450	79.1%	59 min	2.07%	B

Departure window

When Delta 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 141 flights.

There are not enough flights in each departure window to split Delta's JNU to SEA record by time of day without the percentages moving on noise. The headline rate of 92.1% is the reliable figure here.

Across the year

Delta on JNU to SEA through the year

Jul–Sep 202592 flights92.4%
Oct–Dec 202526 flights—
Apr–Jun 202623 flights—

Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 92.1% on time across 141 flights.

Split by quarter, Delta on JNU to SEA logged 92 flights in Jul–Sep 2025, 26 flights in Oct–Dec 2025 and 23 flights in Apr–Jun 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 92.1% annual figure is the one to use.

Delay causes

Why Delta runs late on this route

One category carries most of the weight here. Carrier accounts for 82% of the 1,338 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
82%
National Airspace System
16%
Extreme weather
2%

The largest share of delay minutes, 82%, 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 1,092 of the 1,338 delay minutes reported here. The split is drawn from 1,338 reported delay minutes.

Cancellations are rare at 0.71%, below the national 1.81% 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 costs

Badly late arrivals are rare here: only 2.9% 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 is a different operation and performs like one: it runs 80.0% on time across 141 flights, 12 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 12 points of difference.

One caution: this is a thin sample. 141 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.

What to do with this

Booking Delta on JNU to SEA

Put together: treat all of this as provisional. 141 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 92.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 140 completed flights over 12 months sit behind that.

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.

Key figures