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3,887 km · Domestic

John F. Kennedy (JFK) – Seattle–Tacoma (SEA)

In July 2026, 510 flights operated between John F. Kennedy and Seattle–Tacoma (both directions), and 73.5% left on time, according to the US BTS.

Official · July 2026 according to the US BTS only airlines required to report on-time data to the US DOT

Flights per month

Only complete months are shown. A month appears once the source has published every day of it.

The most recent periods19 periods
PeriodFlights operated 2025Flights operated 2026Change vs last year
January327357▲ 9.2%
February322330▲ 2.5%
March433419▼ 3.2%
April453449▼ 0.9%
May556515▼ 7.4%
June532536▲ 0.8%
July543510▼ 6.1%
August552––
September537––
October536–in progress
November455––
December438––
Year to date (Jan–Jul)3,1663,116▼ 1.6%

On-time departures by month

Departures within 15 minutes of schedule.

The most recent periods19 periods
PeriodOn-time departures 2025On-time departures 2026Change vs last year
January80.4%73.4%▼ 8.7%
February83.2%83.9%▲ 0.8%
March80.4%80.2%▼ 0.2%
April83.4%87.1%▲ 4.4%
May77.5%83.1%▲ 7.2%
June69.4%76.5%▲ 10.2%
July66.5%73.5%▲ 10.5%
August75.4%––
September85.7%––
October84.9%–in progress
November81.3%––
December71.2%––
Year-to-date average (Jan–Jul)77.3%79.7%▲ 3.1%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January017–
February231▲ 1,450.0%
March110▲ 900.0%
April31▼ 66.7%
May211▲ 450.0%
June84▼ 50.0%
July1548▲ 220.0%
August4––
September3––
October10–in progress
November13––
December26––
Year to date (Jan–Jul)31122▲ 293.5%

Airlines on this route

  1. Alaska Airlines 48.1%
  2. Delta Air Lines 46.6%
  3. JetBlue Airways 5.3%

Oct 1, 2024 – Jul 31, 2026

By direction

JFK → SEA

Scheduled flights
5,134
Flights operated
5,025
Cancelled
109 · 2.1%
On-time departures
80.7%

SEA → JFK

Scheduled flights
5,135
Flights operated
5,035
Cancelled
100 · 1.9%
On-time departures
78.5%

JFK → SEA and SEA → JFK counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Alaska Airlines AS 4,939 48.1% 79.0% 106
Delta Air Lines DL 4,782 46.6% 81.7% 86
JetBlue Airways B6 548 5.3% 66.7% 17

Shares are of scheduled flights in the period shown. Codeshare flights are counted once, under the operating airline.

Flight timing & delays

Historical departures, grouped by the scheduled local time at the departure airport. These are recorded outcomes, not a forecast for your flight.

Times are local to the departure airport of each flight; both directions are combined.

US domestic sectors recorded by BTS

Source: the US BTS · Oct 12, 2024 → Jul 31, 2026

Lowest average delay08:00–09:004.3min · 259 recorded · 250 measured
Gap to highest-delay hour14.9min08:00 ↔ 18:00
Recorded flights10,269JFK–SEA

Departure hour

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
00:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 94 recorded · 94 measured · Source: the US BTS 07:00 · 91.0% · 2,232 recorded · 2,180 measured · Source: the US BTS 08:00 · 86.4% · 259 recorded · 250 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 126 recorded · 124 measured · Source: the US BTS 10:00 · 72.0% · 214 recorded · 207 measured · Source: the US BTS 11:00 · 79.0% · 1,593 recorded · 1,569 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 24 recorded · 24 measured · Source: the US BTS 13:00 · 74.8% · 351 recorded · 345 measured · Source: the US BTS 14:00 · 72.0% · 671 recorded · 658 measured · Source: the US BTS 15:00 · 79.1% · 289 recorded · 287 measured · Source: the US BTS 16:00 · 76.8% · 1,435 recorded · 1,405 measured · Source: the US BTS 17:00 · 75.7% · 271 recorded · 263 measured · Source: the US BTS 18:00 · 69.9% · 649 recorded · 631 measured · Source: the US BTS 19:00 · 77.5% · 461 recorded · 454 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 104 recorded · 100 measured · Source: the US BTS 21:00 · 76.2% · 369 recorded · 362 measured · Source: the US BTS 22:00 · 74.9% · 664 recorded · 649 measured · Source: the US BTS 23:00 · 78.1% · 462 recorded · 457 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
00:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · Fewer than 200 measured departures · 94 recorded · 94 measured · Source: the US BTS 07:00 · 4.8 min · 2,232 recorded · 2,180 measured · Source: the US BTS 08:00 · 4.3 min · 259 recorded · 250 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 126 recorded · 124 measured · Source: the US BTS 10:00 · 13.6 min · 214 recorded · 207 measured · Source: the US BTS 11:00 · 13.5 min · 1,593 recorded · 1,569 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 24 recorded · 24 measured · Source: the US BTS 13:00 · 17.9 min · 351 recorded · 345 measured · Source: the US BTS 14:00 · 17.7 min · 671 recorded · 658 measured · Source: the US BTS 15:00 · 16.6 min · 289 recorded · 287 measured · Source: the US BTS 16:00 · 14.9 min · 1,435 recorded · 1,405 measured · Source: the US BTS 17:00 · 17.1 min · 271 recorded · 263 measured · Source: the US BTS 18:00 · 19.2 min · 649 recorded · 631 measured · Source: the US BTS 19:00 · 12.2 min · 461 recorded · 454 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 104 recorded · 100 measured · Source: the US BTS 21:00 · 11.1 min · 369 recorded · 362 measured · Source: the US BTS 22:00 · 15.8 min · 664 recorded · 649 measured · Source: the US BTS 23:00 · 11.9 min · 462 recorded · 457 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
00:00 · 1 · 1 recorded · 1 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · 94 · 94 recorded · 94 measured · Source: the US BTS 07:00 · 2,232 · 2,232 recorded · 2,180 measured · Source: the US BTS 08:00 · 259 · 259 recorded · 250 measured · Source: the US BTS 09:00 · 126 · 126 recorded · 124 measured · Source: the US BTS 10:00 · 214 · 214 recorded · 207 measured · Source: the US BTS 11:00 · 1,593 · 1,593 recorded · 1,569 measured · Source: the US BTS 12:00 · 24 · 24 recorded · 24 measured · Source: the US BTS 13:00 · 351 · 351 recorded · 345 measured · Source: the US BTS 14:00 · 671 · 671 recorded · 658 measured · Source: the US BTS 15:00 · 289 · 289 recorded · 287 measured · Source: the US BTS 16:00 · 1,435 · 1,435 recorded · 1,405 measured · Source: the US BTS 17:00 · 271 · 271 recorded · 263 measured · Source: the US BTS 18:00 · 649 · 649 recorded · 631 measured · Source: the US BTS 19:00 · 461 · 461 recorded · 454 measured · Source: the US BTS 20:00 · 104 · 104 recorded · 100 measured · Source: the US BTS 21:00 · 369 · 369 recorded · 362 measured · Source: the US BTS 22:00 · 664 · 664 recorded · 649 measured · Source: the US BTS 23:00 · 462 · 462 recorded · 457 measured · Source: the US BTS

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View the figures
Departure hourOn-time departuresAverage departure delayWith departure timeRecorded flights
00:00Fewer than 200 measured departures—11
01:00No observations———
02:00No observations———
03:00No observations———
04:00No observations———
05:00No observations———
06:00Fewer than 200 measured departures—9494
07:0091.0%4.8 min2,1802,232
08:0086.4%4.3 min250259
09:00Fewer than 200 measured departures—124126
10:0072.0%13.6 min207214
11:0079.0%13.5 min1,5691,593
12:00Fewer than 200 measured departures—2424
13:0074.8%17.9 min345351
14:0072.0%17.7 min658671
15:0079.1%16.6 min287289
16:0076.8%14.9 min1,4051,435
17:0075.7%17.1 min263271
18:0069.9%19.2 min631649
19:0077.5%12.2 min454461
20:00Fewer than 200 measured departures—100104
21:0076.2%11.1 min362369
22:0074.9%15.8 min649664
23:0078.1%11.9 min457462

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 78.4% · 1,471 recorded · 1,434 measured · Source: the US BTS Tuesday · 82.5% · 1,463 recorded · 1,432 measured · Source: the US BTS Wednesday · 82.8% · 1,468 recorded · 1,459 measured · Source: the US BTS Thursday · 77.9% · 1,458 recorded · 1,438 measured · Source: the US BTS Friday · 78.0% · 1,474 recorded · 1,451 measured · Source: the US BTS Saturday · 81.4% · 1,461 recorded · 1,422 measured · Source: the US BTS Sunday · 76.3% · 1,474 recorded · 1,424 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Monday · 14.9 min · 1,471 recorded · 1,434 measured · Source: the US BTS Tuesday · 10.3 min · 1,463 recorded · 1,432 measured · Source: the US BTS Wednesday · 10.2 min · 1,468 recorded · 1,459 measured · Source: the US BTS Thursday · 12.9 min · 1,458 recorded · 1,438 measured · Source: the US BTS Friday · 12.4 min · 1,474 recorded · 1,451 measured · Source: the US BTS Saturday · 12.5 min · 1,461 recorded · 1,422 measured · Source: the US BTS Sunday · 14.9 min · 1,474 recorded · 1,424 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Monday · 1,471 · 1,471 recorded · 1,434 measured · Source: the US BTS Tuesday · 1,463 · 1,463 recorded · 1,432 measured · Source: the US BTS Wednesday · 1,468 · 1,468 recorded · 1,459 measured · Source: the US BTS Thursday · 1,458 · 1,458 recorded · 1,438 measured · Source: the US BTS Friday · 1,474 · 1,474 recorded · 1,451 measured · Source: the US BTS Saturday · 1,461 · 1,461 recorded · 1,422 measured · Source: the US BTS Sunday · 1,474 · 1,474 recorded · 1,424 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday78.4%14.9 min1,4341,471
Tuesday82.5%10.3 min1,4321,463
Wednesday82.8%10.2 min1,4591,468
Thursday77.9%12.9 min1,4381,458
Friday78.0%12.4 min1,4511,474
Saturday81.4%12.5 min1,4221,461
Sunday76.3%14.9 min1,4241,474

Month of year

Months combine the same calendar month across the years shown; this is a seasonal pattern, not a monthly time series.

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Jan · 76.8% · 701 recorded · 684 measured · Source: the US BTS Feb · 83.6% · 685 recorded · 652 measured · Source: the US BTS Mar · 80.3% · 863 recorded · 852 measured · Source: the US BTS Apr · 85.3% · 906 recorded · 902 measured · Source: the US BTS May · 80.2% · 1,084 recorded · 1,071 measured · Source: the US BTS Jun · 72.9% · 1,080 recorded · 1,068 measured · Source: the US BTS Jul · 69.9% · 1,116 recorded · 1,053 measured · Source: the US BTS Aug · 75.4% · 556 recorded · 552 measured · Source: the US BTS Sep · 85.7% · 540 recorded · 537 measured · Source: the US BTS Oct · 85.8% · 864 recorded · 854 measured · Source: the US BTS Nov · 86.7% · 937 recorded · 924 measured · Source: the US BTS Dec · 77.0% · 937 recorded · 911 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Jan · 13.4 min · 701 recorded · 684 measured · Source: the US BTS Feb · 9.2 min · 685 recorded · 652 measured · Source: the US BTS Mar · 10.2 min · 863 recorded · 852 measured · Source: the US BTS Apr · 6.9 min · 906 recorded · 902 measured · Source: the US BTS May · 12.7 min · 1,084 recorded · 1,071 measured · Source: the US BTS Jun · 19.1 min · 1,080 recorded · 1,068 measured · Source: the US BTS Jul · 25.4 min · 1,116 recorded · 1,053 measured · Source: the US BTS Aug · 14.6 min · 556 recorded · 552 measured · Source: the US BTS Sep · 5.7 min · 540 recorded · 537 measured · Source: the US BTS Oct · 7.9 min · 864 recorded · 854 measured · Source: the US BTS Nov · 4.9 min · 937 recorded · 924 measured · Source: the US BTS Dec · 14.6 min · 937 recorded · 911 measured · Source: the US BTS

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Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Jan · 701 · 701 recorded · 684 measured · Source: the US BTS Feb · 685 · 685 recorded · 652 measured · Source: the US BTS Mar · 863 · 863 recorded · 852 measured · Source: the US BTS Apr · 906 · 906 recorded · 902 measured · Source: the US BTS May · 1,084 · 1,084 recorded · 1,071 measured · Source: the US BTS Jun · 1,080 · 1,080 recorded · 1,068 measured · Source: the US BTS Jul · 1,116 · 1,116 recorded · 1,053 measured · Source: the US BTS Aug · 556 · 556 recorded · 552 measured · Source: the US BTS Sep · 540 · 540 recorded · 537 measured · Source: the US BTS Oct · 864 · 864 recorded · 854 measured · Source: the US BTS Nov · 937 · 937 recorded · 924 measured · Source: the US BTS Dec · 937 · 937 recorded · 911 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan76.8%13.4 min684701
Feb83.6%9.2 min652685
Mar80.3%10.2 min852863
Apr85.3%6.9 min902906
May80.2%12.7 min1,0711,084
Jun72.9%19.1 min1,0681,080
Jul69.9%25.4 min1,0531,116
Aug75.4%14.6 min552556
Sep85.7%5.7 min537540
Oct85.8%7.9 min854864
Nov86.7%4.9 min924937
Dec77.0%14.6 min911937

Delay and on-time rates need at least 200 measured departures per bucket. Smaller samples remain visible in the flight-count chart. An empty slot means no observations, not zero flights.

Recorded outcomes

  • On time 78.0% 8,008
  • Delayed >15 min 20.0% 2,052
  • Cancelled 2.0% 209
  • Missing departure time 0.0% 0

All recorded flights with a known scheduled local time, counted once. Missing actual times are shown separately.

On time means departing no more than 15 minutes after schedule. Cancelled flights and flights missing departure times are excluded from the on-time rate and average delay.

Flight numbers on this route

26
26 of 26
Flight numbersBy direction DeparturesOn time
DL429 SEA → JFK 658 93.2%
AS34 SEA → JFK 657 75.8%
DL699 JFK → SEA 657 91.3%
DL740 JFK → SEA 655 78.7%
DL415 SEA → JFK 654 74.1%
DL452 SEA → JFK 654 82.2%
DL688 JFK → SEA 650 73.4%
AS31 JFK → SEA 645 81.9%
AS16 SEA → JFK 612 71.4%
AS17 JFK → SEA 580 70.0%
AS21 JFK → SEA 577 84.6%
AS23 JFK → SEA 577 86.9%
AS26 SEA → JFK 576 84.6%
AS22 SEA → JFK 542 76.2%
B66263 JFK → SEA 274 72.7%
B66264 SEA → JFK 274 60.6%
DL1719 SEA → JFK 239 81.0%
DL491 JFK → SEA 193 83.7%
DL1719 JFK → SEA 142 74.6%
DL337 JFK → SEA 70 90.0%
DL446 SEA → JFK 68 79.4%
DL461 SEA → JFK 55 56.9%
AS27 JFK → SEA 34 91.2%
AS32 JFK → SEA 34 83.9%
DL1274 SEA → JFK 32 78.1%
DL722 SEA → JFK 31 77.4%

Flight numbers are the codes sold on tickets. On shared flights one aircraft can carry several of them. Only numbers with at least 30 flights have a page.

Monthly figures
PeriodFlights operated Change vs last yearCancelled On-time departures
July 2026 510 −6.1% 48 73.5%
June 2026 536 +0.8% 4 76.5%
May 2026 515 −7.4% 11 83.1%
April 2026 449 −0.9% 1 87.1%
March 2026 419 −3.2% 10 80.2%
February 2026 330 +2.5% 31 83.9%
January 2026 357 +9.2% 17 73.4%
December 2025 438 −7.4% 26 71.2%
November 2025 455 −3.0% 13 81.3%
October 2025 536 +68.6% 10 84.9%
September 2025 537 3 85.7%
August 2025 552 4 75.4%
July 2025 543 15 66.5%
June 2025 532 8 69.4%
May 2025 556 2 77.5%
April 2025 453 3 83.4%
March 2025 433 1 80.4%
February 2025 322 2 83.2%
January 2025 327 0 80.4%
December 2024 473 0 82.2%
November 2024 469 0 91.9%
October 2024 318 0 87.4%

How to read this chart

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