Flight number record

AS 34

Alaska Airlines · Seattle to New York

Route: SEA → JFK
Departs: 11:00
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AS 34, check with Alaska Airlines.

AS 34 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 364 flights, with a median arrival 1 minute early.

The national on-time rate over the same period is 77.6%, so AS 34 runs 7 points behind the country as a whole. Across a thousand flights that is about 65 extra late arrivals.

On time

71.1%

Arrivals under 15 minutes late, of 350 completed flights

Avg delay

62 min

Across delayed arrivals only, not all flights

Cancelled

2.75%

National rate is 1.81%

1 hour+ late

11.1%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. Beyond the headline rate, 11.1% 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 34 flies

AS 34 flies SEA to JFK without a single fixed slot. Its most common scheduled departure was 11:00, used on 65 of 364 flights, with 11:06 (50 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:0065 flights17.9%
Departs 11:0650 flights13.7%

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 11:00 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and AS 34 runs 8 points worse at 71.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

AS 34 next to SEA to JFK

Every carrier on SEA to JFK combined arrived on time 75.3% of the time across 2,906 flights, so AS 34 is 4 points behind it. Alaska flew 1,403 flights on the same city pair under all its flight numbers, including this one, and those ran 71.6% on time. Across its whole network Alaska Airlines managed 79.1%, which this flight trails by 8 points.

AS 34 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AS 34thin sample	364	71.1%	62 min	2.75%	C
All Alaska Airlines on SEA–JFK	1,403	71.6%	54 min	2.57%	C
All carriers on SEA–JFK	2,906	75.3%	62 min	2.41%	B
Alaska Airlines, whole network	293,372	79.1%	52 min	1.28%	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 44.3%, a swing of 50 points on roughly 91 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 flights44.3%
Oct–Dec 202592 flights62.5%
Jan–Mar 202689 flights94.1%
Apr–Jun 202691 flights84.3%

Scale runs 35% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, AS 34 did best on Friday at 83.3% on time and worst on Sunday at 61.7%. Each day rests on about 52 flights, so a gap of 22 points is worth noticing but could still narrow in another year.

Delay causes

Why AS 34 runs late

One category carries most of the weight here. National Airspace System accounts for 52% of the 6,215 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.

National Airspace System
52%
Carrier
20%
Late-arriving aircraft
15%
Extreme weather
10%
Security
2%

52% 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 3,258 minutes out of 6,215, against a national NAS share of 21%. The split is drawn from 6,215 delay minutes reported on AS 34.

Cancellations run at 2.75%, against 1.81% nationally. That is roughly one flight in 40 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.1% 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 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: 2.75% 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.

Where to go next

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.

Key figures