Flight number record
AS 34
Alaska Airlines · Seattle to New York
- Route
- SEA → JFK
- Departs
- 09:29
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 34, check with Alaska Airlines.
AS 34 lands a B−, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 364 flights, with a median arrival 6 minutes early.
Key figures
On time
77.1%
Arrivals under 15 minutes late, of 349 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
3.30%
National rate is 1.89%
1 hour+ late
7.2%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. The median arrival is 6 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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Schedule
When AS 34 flies
AS 34 flies SEA to JFK without a single fixed slot. Its most common scheduled departure was 09:29, used on 70 of 364 flights, with 11:00 (53 flights) next.
- Departs 09:2970 flights19.2%
- Departs 11:0053 flights14.6%
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 09:29 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and AS 34 runs 7 points worse at 77.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
AS 34 next to SEA to JFK
Every carrier on SEA to JFK combined arrived on time 78.0% of the time across 2,906 flights, so AS 34 is about level with it. Alaska flew 1,402 flights on the same city pair under all its flight numbers, including this one, and those ran 77.7% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 34thin sample | 364 | 77.1% | 57 min | 3.30% | B− |
| All Alaska Airlines on SEA–JFK | 1,402 | 77.7% | 53 min | 2.64% | B |
| All carriers on SEA–JFK | 2,906 | 78.0% | 69 min | 3.20% | B− |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 34 quarter by quarter
AS 34 did not run the same all year. Its best quarter was Jan–Mar 2026 at 94.1% on time and its weakest Jul–Sep 2025 at 56.7%, a swing of 37 points on roughly 73 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 flights56.7%
- Oct–Dec 202592 flights62.5%
- Jan–Mar 202689 flights94.1%
- Apr–Jun 202691 flights84.3%
- Jul–Sep 202662 flights73.7%
Scale runs 50% to 100%.
By weekday, AS 34 did best on Saturday at 83.7% on time and worst on Sunday at 69.4%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 34 runs when it is late
AS 34 often beats the schedule: 128 of 349 completed flights, 37%, arrived 15 minutes or more early. The 80 late arrivals split 32 under half an hour, 23 between 30 and 60 minutes, and 25 an hour or more.
- 15+ min early128 flights36.7%
- Within 15 min141 flights40.4%
- 15–29 min late32 flights9.2%
- 30–59 min late23 flights6.6%
- 1–2 hours late15 flights4.3%
- 2+ hours late10 flights2.9%
Scale runs 0% to 100%.
Share of 349 completed flights by arrival against schedule.
22 of 78 late departures made up the time and arrived on time, 28% of them. In the other direction, 24 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 JFK.
The worst days
Worst days for AS 34
The latest arrival of the period was on 30 October 2025, 5 hours 25 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 national airspace system delay.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 October 2025 | 5 hours 25 minutes | Extreme weather |
| 8 November 2025 | 3 hours 27 minutes | National Airspace System |
| 9 July 2026 | 3 hours 11 minutes | National Airspace System |
| 14 June 2026 | 2 hours 44 minutes | National Airspace System |
| 19 December 2025 | 2 hours 43 minutes | National Airspace System |
Delay causes
Why AS 34 runs late
National Airspace System accounts for 53% of the 4,577 delay minutes carriers reported here, and the remaining four split what is left.
- 53%National Airspace System
- 20%Carrier
- 17%Late-arriving aircraft
- 8%Extreme weather
- 3%Security
53% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 2,410 minutes out of 4,577, against a national NAS share of 21%. The split is drawn from 4,577 delay minutes reported on AS 34.
Cancellations run at 3.30%, against 1.89% nationally. That is about one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
7.2% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
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 364 flights under AS 34 in the data flew SEA to JFK. 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. 364 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 34
For a booking, the cancellation rate is the figure to plan around on AS 34: 3.30% of its 364 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- SEA to JFK, every carrier and departure
- JFK to SEA, the return direction
- Delta Air Lines 429 on the same route88.4%
- Alaska Airlines 26 on the same route86.9%
- Delta Air Lines 415 on the same route71.5%
- Delta Air Lines 452 on the same route84.4%
- Alaska Airlines 16 on the same route64.3%
- Alaska Airlines 22 on the same route83.9%
- Seattle-Tacoma International (SEA) delay statistics
- John F. Kennedy International (JFK) 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
- The best time of day to fly, according to 7.05 million flight records
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.