Flight number record
AS 17
Alaska Airlines · New York to Seattle
- Route
- JFK → SEA
- Departs
- 20:23
- Flights
- 287
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 17, check with Alaska Airlines.
AS 17 earns an F, which is as low as this site's scale goes for a reason. Only 50.4% of flights arrive inside the 15-minute window, 27 points worse than the national rate of 77.3%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 287 flights, with a median arrival 13 minutes late.
The national on-time rate over the same period is 77.3%, so AS 17 runs 27 points behind the country as a whole. Across a thousand flights that is about 269 extra late arrivals.
Key figures
On time
50.4%
Arrivals under 15 minutes late, of 282 completed flights
Avg delay
77 min
Across delayed arrivals only, not all flights
Cancelled
1.74%
National rate is 1.89%
1 hour+ late
22.3%
National rate is 8.3%
These figures cover 287 flights between September 2025 and August 2026. Beyond the headline rate, 22.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When AS 17 flies
AS 17 flies JFK to SEA without a single fixed slot. Its most common scheduled departure was 20:23, used on 70 of 287 flights, with 18:55 (38 flights) and 18:43 (35 flights) next.
- Departs 20:2370 flights24.4%
- Departs 18:5538 flights13.2%
- Departs 18:4335 flights12.2%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 20:23 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and AS 17 runs 20 points worse at 50.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
AS 17 next to JFK to SEA
Every carrier on JFK to SEA combined arrived on time 69.5% of the time across 2,906 flights, so AS 17 is 19 points behind it. Alaska flew 1,401 flights on the same city pair under all its flight numbers, including this one, and those ran 68.1% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight trails by 29 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 17thin sample | 287 | 50.4% | 77 min | 1.74% | F |
| All Alaska Airlines on JFK–SEA | 1,401 | 68.1% | 65 min | 3.35% | C− |
| All carriers on JFK–SEA | 2,906 | 69.5% | 65 min | 3.44% | C− |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 17 quarter by quarter
AS 17 did not run the same all year. Its best quarter was Apr–Jun 2026 at 65.9% on time and its weakest Oct–Dec 2025 at 37.1%, a swing of 29 points on roughly 72 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights60.0%
- Oct–Dec 202591 flights37.1%
- Jan–Mar 202620 flights—
- Apr–Jun 202685 flights65.9%
- Jul–Sep 202661 flights56.9%
Scale runs 30% to 70%. Rows with fewer than 30 flights show a dash.
By weekday, AS 17 did best on Saturday at 59.5% on time and worst on Thursday at 35.0%. Each day rests on about 41 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 17 runs when it is late
The 140 late arrivals split 37 under half an hour, 40 between 30 and 60 minutes, and 63 an hour or more.
- 15+ min early43 flights15.2%
- Within 15 min99 flights35.1%
- 15–29 min late37 flights13.1%
- 30–59 min late40 flights14.2%
- 1–2 hours late34 flights12.1%
- 2+ hours late29 flights10.3%
Scale runs 0% to 100%.
Share of 282 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 85 departures that left 15 minutes late or more, only 6 made it up before arrival. In the other direction, 61 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 AS 17
The latest arrival of the period was on 20 May 2026, 5 hours 14 minutes behind schedule; most of its delay minutes were filed as extreme weather. On four of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 20 May 2026 | 5 hours 14 minutes | Extreme weather |
| 14 December 2025 | 4 hours 38 minutes | Late-arriving aircraft |
| 14 June 2026 | 4 hours 28 minutes | Late-arriving aircraft |
| 3 July 2026 | 4 hours 3 minutes | Late-arriving aircraft |
| 29 December 2025 | 3 hours 56 minutes | Late-arriving aircraft |
Delay causes
Why AS 17 runs late
Late-arriving aircraft accounts for 46% of the 11,000 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Late-arriving aircraft
- 33%National Airspace System
- 13%Carrier
- 8%Extreme weather
46% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 11,000 reported delay minutes here, that single category outweighs weather by 6 to one. The split is drawn from 10,758 delay minutes reported on AS 17.
Cancellations sit at 1.74% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
22.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 2,422 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
Every one of the 287 flights under AS 17 in the data flew JFK to SEA. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 287 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 AS 17
For a booking, AS 17 is a flight to put a long connection behind. 22.3% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- JFK to SEA, every carrier and departure
- SEA to JFK, the return direction
- Delta Air Lines 699 on the same route73.5%
- Delta Air Lines 740 on the same route68.6%
- Alaska Airlines 31 on the same route71.9%
- Delta Air Lines 688 on the same route64.4%
- Alaska Airlines 21 on the same route69.0%
- Alaska Airlines 23 on the same route78.1%
- John F. Kennedy International (JFK) delay statistics
- Seattle-Tacoma International (SEA) delay statistics
- Alaska Airlines on-time record
- Every Alaska Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means Alaska Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
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.