Flight number record
AS 17
Alaska Airlines · New York to Seattle
- Route
- JFK → SEA
- Departs
- 18:53
- Flights
- 288
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 46.6% of flights arrive inside the 15-minute window, 31 points worse than the national rate of 77.6%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 288 flights, with a median arrival 17 minutes late.
The national on-time rate over the same period is 77.6%, so AS 17 runs 31 points behind the country as a whole. Across a thousand flights that is about 310 extra late arrivals.
Key figures
On time
46.6%
Arrivals under 15 minutes late, of 281 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
2.08%
National rate is 1.81%
1 hour+ late
20.6%
National rate is 8.1%
These figures cover 288 flights between July 2025 and June 2026. Beyond the headline rate, 20.6% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When AS 17 flies
AS 17 flies JFK to SEA without a single fixed slot. Its most common scheduled departure was 18:53, used on 50 of 288 flights, with 18:36 (45 flights) and 18:55 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 18:5350 flights17.4%
- Departs 18:3645 flights15.6%
- Departs 18:5538 flights13.2%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 18:53 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and AS 17 runs 22 points worse at 46.6%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
AS 17 next to JFK to SEA
Every carrier on JFK to SEA combined arrived on time 69.7% of the time across 2,906 flights, so AS 17 is 23 points behind it. Alaska flew 1,402 flights on the same city pair under all its flight numbers, including this one, and those ran 66.2% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight trails by 32 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 17thin sample | 288 | 46.6% | 69 min | 2.08% | F |
| All Alaska Airlines on JFK–SEA | 1,402 | 66.2% | 61 min | 3.00% | C |
| All carriers on JFK–SEA | 2,906 | 69.7% | 61 min | 2.58% | C |
| Alaska Airlines, whole network | 293,372 | 79.1% | 52 min | 1.28% | 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 96 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 202592 flights46.0%
- Oct–Dec 202591 flights37.1%
- Jan–Mar 202620 flights—
- Apr–Jun 202685 flights65.9%
Scale runs 30% to 70%. Rows with fewer than 30 flights show a dash.
By weekday, AS 17 did best on Sunday at 53.8% on time and worst on Thursday at 27.5%. Each day rests on about 41 flights, so a gap of 26 points is worth noticing but could still narrow in another year.
Delay causes
Why AS 17 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 42% of the 10,000 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.
- 42%Late-arriving aircraft
- 40%National Airspace System
- 11%Carrier
- 7%Extreme weather
42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 10,000 reported delay minutes here, that single category outweighs weather by 7 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 10,310 delay minutes reported on AS 17.
Cancellations sit at 2.08% against a national 1.81%, which is ordinary. Diversions add another 0.35%.
Connections and routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 20.6% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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 288 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. 288 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. 20.6% 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 route75.1%
- Delta Air Lines 740 on the same route69.7%
- Alaska Airlines 31 on the same route71.3%
- Delta Air Lines 688 on the same route66.0%
- Alaska Airlines 21 on the same route67.2%
- Alaska Airlines 23 on the same route75.6%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.