Carrier route record

B6JFK→SEA

JetBlue Airways · New York to Seattle

Flights: 166
Period: July 2025 to June 2026
Share of route: 6%
Carriers: 3

Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with JetBlue Airways.

JetBlue on JFK to SEA sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 166 flights. The strongest carrier on the route with a full sample, Delta Air Lines, flew 1,338 at 73.2% on time.

The national on-time rate over the same period is 77.6%, so JetBlue on JFK to SEA runs 6 points behind the country as a whole. Across a thousand flights that is about 63 extra late arrivals.

On time

71.3%

Arrivals under 15 minutes late, of 164 completed flights

Avg delay

98 min

Across delayed arrivals only, not all flights

Cancelled

1.20%

National rate is 1.81%

Whole route

69.7%

Every carrier on JFK to SEA, 2,906 flights

These figures cover 166 flights between July 2025 and June 2026. Beyond the headline rate, 14.0% 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.

Carrier by carrier

JetBlue against every carrier on JFK to SEA

JetBlue flew 166 of the 2,906 flights on JFK to SEA, about 6% of it. Its 71.3% on time is 2 points better than the route as a whole, which runs 69.7%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from Delta at 73.2% to Alaska at 66.2%.

The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 73.2% of the time; Alaska Airlines manages 66.2%. Sample sizes sit next to every figure, because a two-point gap across 1,402 flights means less than a ten-point one.

On-time performance by carrier on JFK to SEA
Airline	Flights	On time	Avg delay	Cancelled	Grade
Delta Air Lines	1,338	73.2%	57 min	2.32%	C
JetBlue Airways (this page)thin sample	166	71.3%	98 min	1.20%	C
Alaska Airlines	1,402	66.2%	61 min	3.00%	C

Delta leads Alaska by 7 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

Departure window

When JetBlue runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 34 points, against 7 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am—
8am–11am—
11am–2pm—
2pm–5pm60 flights50.0%
5pm–8pm106 flights83.7%
8pm–5am—

Scale runs 40% to 90%. Rows with fewer than 30 flights show a dash.

The 5pm–8pm window is the strongest at 83.7% on time. The full set of windows spans 34 points.

Across the year

JetBlue on JFK to SEA through the year

Jul–Sep 202592 flights62.6%
Oct–Dec 202525 flights—
Apr–Jun 202649 flights79.2%

Scale runs 55% to 85%. 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 71.3% on time across 166 flights.

Split by quarter, JetBlue on JFK to SEA logged 92 flights in Jul–Sep 2025, 25 flights in Oct–Dec 2025 and 49 flights in Apr–Jun 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 71.3% annual figure is the one to use.

Delay causes

Why JetBlue runs late on this route

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 4,592 reported delay minutes.

National Airspace System
36%
Late-arriving aircraft
23%
Carrier
23%
Extreme weather
13%
Security
6%

Extreme weather accounts for 13% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.1 times the usual weather exposure. The split is drawn from 4,592 reported delay minutes.

36% 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 1,642 minutes out of 4,592, against a national NAS share of 21%.

Cancellations sit at 1.20% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and stage length

What a delay here costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 14.0% 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.

The return leg runs 72.0% on time across 166 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.

One caution: this is a thin sample. 166 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 JetBlue on JFK to SEA

Put together: treat all of this as provisional. 166 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 71.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 164 completed flights over 12 months sit behind that.

Where to go next

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