Carrier route record
DLSEA→JNU
Delta Air Lines · Seattle to Juneau
- Flights
- 141
- Period
- September 2025 to August 2026
- Share of route
- 9%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on SEA to JNU 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 roughly 40 minutes. That rests on 141 flights, with a median arrival 2 minutes early.
Set against the rest of the country, Delta's SEA to JNU 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 139 completed flights
Avg delay
42 min
Across delayed arrivals only, not all flights
Cancelled
1.42%
National rate is 1.89%
Whole route
79.2%
Every carrier on SEA to JNU, 1,588 flights
These figures cover 141 flights between September 2025 and August 2026. The median arrival is 2 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
Delta against every carrier on SEA to JNU
Delta flew 141 of the 1,588 flights on SEA to JNU, about 9% of it. Its 84.9% on time is 6 points better than the route as a whole, which runs 79.2%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from Delta at 84.9% to Alaska at 78.7%.
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 Lines (this page)thin sample | 141 | 84.9% | 42 min | 1.42% | B |
| Alaska Airlines | 1,447 | 78.7% | 51 min | 1.24% | B |
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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 SEA to JNU record by time of day without the percentages moving on noise. The headline rate of 84.9% is the reliable figure here.
Across the year
Delta on SEA to JNU through the year
- Jul–Sep 202530 flights90.0%
- Oct–Dec 202525 flights—
- Apr–Jun 202624 flights—
- Jul–Sep 202662 flights85.2%
Scale runs 75% to 95%. 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 84.9% on time across 141 flights.
Split by quarter, Delta on SEA to JNU logged 30 flights in Jul–Sep 2025, 25 flights in Oct–Dec 2025, 24 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 84.9% annual figure is the one to use.
Arrival by arrival
How late Delta on SEA to JNU runs when it is late
The 21 late arrivals split 9 under half an hour, 6 between 30 and 60 minutes, and 6 an hour or more. Not one arrived two hours late.
- 15+ min early33 flights23.7%
- Within 15 min85 flights61.2%
- 15–29 min late9 flights6.5%
- 30–59 min late6 flights4.3%
- 1–2 hours late6 flights4.3%
- 2+ hours late0 flights0.0%
Scale runs 0% to 100%.
Share of 139 completed flights by arrival against schedule.
6 of 23 late departures made up the time and arrived on time, 26% of them. 4 flights left on time and still arrived late.
The worst days
Worst days for Delta on SEA to JNU
The latest arrival of the period was on 17 June 2026, 1 hour 25 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 June 2026 | 1 hour 25 minutes | Carrier |
| 14 September 2025 | 1 hour 10 minutes | Carrier |
| 17 August 2026 | 1 hour 8 minutes | Late-arriving aircraft |
| 13 September 2025 | 1 hour 6 minutes | Carrier |
| 21 June 2026 | 1 hour 2 minutes | Carrier |
Delay causes
Why Delta runs late on this route
Carrier accounts for 49% of the 880 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Carrier
- 30%Late-arriving aircraft
- 13%National Airspace System
- 7%Extreme weather
The largest share of delay minutes, 49%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 434 of the 880 delay minutes reported here. The split is drawn from 880 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 4.3% 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 92.1% on time across 141 flights, 7 points above 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 SEA to JNU
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 84.9% 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
- SEA to JNU, every carrier
- Delta on JNU to SEA, the return leg
- Alaska Airlines on SEA to JNU78.7%
- Delta Air Lines network-wide record
- Seattle-Tacoma International (SEA) delay statistics
- How to read this site: grades, sample sizes, and honest caveats
- Seattle and Portland airports: why the evening flight holds up
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.