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DelayAtlas

Carrier route record

DLJNU→SEA

Delta Air Lines · Juneau to Seattle

Flights
141
Period
September 2025 to August 2026
Share of route
9%
Carriers
2
AGRADE

Historical statistics for September 2025 to August 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 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 141 flights, with a median arrival 13 minutes early.

Set against the rest of the country, Delta's JNU to SEA record is 15 points better than the US average of 77.3%. That gap is worth roughly 148 fewer late arrivals for every thousand flights.

Key figures

On time

92.1%

Arrivals under 15 minutes late, of 139 completed flights

Avg delay

114 min

Across delayed arrivals only, not all flights

Cancelled

1.42%

National rate is 1.89%

Whole route

81.4%

Every carrier on JNU to SEA, 1,589 flights

These figures cover 141 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.

Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.

Carrier by carrier

Delta against every carrier on JNU to SEA

Delta flew 141 of the 1,589 flights on JNU to SEA, about 9% of it. Its 92.1% on time is 11 points better than the route as a whole, which runs 81.4%. 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 80.4%.

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
AirlineFlightsOn timeAvg delayCancelledGrade
Delta Air Lines (this page)thin sample14192.1%114 min1.42%A
Alaska Airlines1,44880.4%58 min1.86%B

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 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 202530 flights83.3%
  • Oct–Dec 202526 flights—
  • Apr–Jun 202623 flights—
  • Jul–Sep 202662 flights96.7%

Scale runs 75% 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 30 flights in Jul–Sep 2025, 26 flights in Oct–Dec 2025, 23 flights in Apr–Jun 2026 and 62 flights in Jul–Sep 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.

Arrival by arrival

How late Delta on JNU to SEA runs when it is late

Delta on JNU to SEA often beats the schedule: 62 of 139 completed flights, 45%, arrived 15 minutes or more early. The 11 late arrivals split 4 under half an hour, 4 between 30 and 60 minutes, and 3 an hour or more.

  • 15+ min early62 flights44.6%
  • Within 15 min66 flights47.5%
  • 15–29 min late4 flights2.9%
  • 30–59 min late4 flights2.9%
  • 1–2 hours late2 flights1.4%
  • 2+ hours late1 flights0.7%

Scale runs 0% to 100%.

Share of 139 completed flights by arrival against schedule.

Only 9 of 139 completed flights left 15 minutes late or more, too few to say how often the time is made up.

The worst days

Worst days for Delta on JNU to SEA

The latest arrival of the period was on 18 September 2025, 13 hours 33 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in September 2025.

The latest arrivals of Delta on JNU to SEA in the period
DateArrived late byLargest filed cause
18 September 202513 hours 33 minutesCarrier
19 September 20251 hour 43 minutesCarrier
17 September 20251 hour 25 minutesNational Airspace System
16 July 202656 minutesCarrier
1 October 202547 minutesExtreme weather

Delay causes

Why Delta runs late on this route

Carrier accounts for 80% of the 1,249 delay minutes carriers reported here, and the remaining four split what is left.

  • Carrier
    80%
  • National Airspace System
    17%
  • Extreme weather
    3%

The largest share of delay minutes, 80%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 999 of the 1,249 delay minutes reported here. The split is drawn from 1,249 reported delay minutes.

Cancellations sit at 1.42% 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 2.2% 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 is a different operation and performs like one: it runs 84.9% on time across 141 flights, 7 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 7 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. 139 completed flights over 12 months sit behind that.

Related

Where to go next

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.