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3,505 km · Domestic

Hartsfield Jackson Atlanta (ATL) – Seattle–Tacoma (SEA)

In July 2026, 692 flights operated between Hartsfield Jackson Atlanta and Seattle–Tacoma (both directions), and 76.9% 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
January416422▲ 1.4%
February368382▲ 3.8%
March446457▲ 2.5%
April483500▲ 3.5%
May583594▲ 1.9%
June649648▼ 0.2%
July690692▲ 0.3%
August629––
September567––
October584–in progress
November510––
December531––
Year to date (Jan–Jul)3,6353,695▲ 1.7%

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
January74.8%82.9%▲ 10.8%
February78.3%85.9%▲ 9.7%
March85.4%76.1%▼ 10.9%
April84.7%87.2%▲ 3.0%
May81.1%81.0%▼ 0.1%
June74.0%84.9%▲ 14.7%
July76.4%76.9%▲ 0.7%
August80.1%––
September90.8%––
October84.2%–in progress
November86.7%––
December70.6%––
Year-to-date average (Jan–Jul)79.2%82.1%▲ 3.6%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January145▼ 64.3%
February02–
March16▲ 500.0%
April43▼ 25.0%
May00–
June81▼ 87.5%
July440.0%
August2––
September0––
October6–in progress
November3––
December7––
Year to date (Jan–Jul)3121▼ 32.3%

Airlines on this route

  1. Delta Air Lines 72.8%
  2. Alaska Airlines 27.2%

Oct 1, 2024 – Jul 31, 2026

By direction

ATL → SEA

Scheduled flights
5,830
Flights operated
5,793
Cancelled
37 · 0.6%
On-time departures
81.1%

SEA → ATL

Scheduled flights
5,832
Flights operated
5,799
Cancelled
33 · 0.6%
On-time departures
82.2%

ATL → SEA and SEA → ATL counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Delta Air Lines DL 8,486 72.8% 83.1% 48
Alaska Airlines AS 3,176 27.2% 77.6% 22

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 delay06:00–07:004.2min · 781 recorded · 778 measured
Gap to highest-delay hour14.4min06:00 ↔ 19:00
Recorded flights11,662ATL–SEA

Departure hour

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 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 · 90.8% · 781 recorded · 778 measured · Source: the US BTS 07:00 · 87.9% · 1,561 recorded · 1,549 measured · Source: the US BTS 08:00 · 81.6% · 572 recorded · 565 measured · Source: the US BTS 09:00 · 83.3% · 1,307 recorded · 1,302 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 115 recorded · 115 measured · Source: the US BTS 11:00 · 81.9% · 1,053 recorded · 1,050 measured · Source: the US BTS 12:00 · 84.0% · 451 recorded · 449 measured · Source: the US BTS 13:00 · 86.8% · 591 recorded · 590 measured · Source: the US BTS 14:00 · 80.5% · 216 recorded · 215 measured · Source: the US BTS 15:00 · 82.8% · 693 recorded · 690 measured · Source: the US BTS 16:00 · 78.4% · 1,047 recorded · 1,041 measured · Source: the US BTS 17:00 · 72.6% · 253 recorded · 252 measured · Source: the US BTS 18:00 · 75.5% · 290 recorded · 290 measured · Source: the US BTS 19:00 · 67.6% · 671 recorded · 661 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 87 recorded · 87 measured · Source: the US BTS 21:00 · 77.9% · 805 recorded · 799 measured · Source: the US BTS 22:00 · 79.2% · 358 recorded · 355 measured · Source: the US BTS 23:00 · 78.1% · 811 recorded · 804 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 · No observations · 0 recorded · 0 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 · 4.2 min · 781 recorded · 778 measured · Source: the US BTS 07:00 · 10.1 min · 1,561 recorded · 1,549 measured · Source: the US BTS 08:00 · 14.7 min · 572 recorded · 565 measured · Source: the US BTS 09:00 · 7.9 min · 1,307 recorded · 1,302 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 115 recorded · 115 measured · Source: the US BTS 11:00 · 11.2 min · 1,053 recorded · 1,050 measured · Source: the US BTS 12:00 · 7.6 min · 451 recorded · 449 measured · Source: the US BTS 13:00 · 9.8 min · 591 recorded · 590 measured · Source: the US BTS 14:00 · 6.6 min · 216 recorded · 215 measured · Source: the US BTS 15:00 · 12.8 min · 693 recorded · 690 measured · Source: the US BTS 16:00 · 11.6 min · 1,047 recorded · 1,041 measured · Source: the US BTS 17:00 · 18.3 min · 253 recorded · 252 measured · Source: the US BTS 18:00 · 18.0 min · 290 recorded · 290 measured · Source: the US BTS 19:00 · 18.5 min · 671 recorded · 661 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 87 recorded · 87 measured · Source: the US BTS 21:00 · 13.5 min · 805 recorded · 799 measured · Source: the US BTS 22:00 · 10.5 min · 358 recorded · 355 measured · Source: the US BTS 23:00 · 14.6 min · 811 recorded · 804 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 · No observations · 0 recorded · 0 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 · 781 · 781 recorded · 778 measured · Source: the US BTS 07:00 · 1,561 · 1,561 recorded · 1,549 measured · Source: the US BTS 08:00 · 572 · 572 recorded · 565 measured · Source: the US BTS 09:00 · 1,307 · 1,307 recorded · 1,302 measured · Source: the US BTS 10:00 · 115 · 115 recorded · 115 measured · Source: the US BTS 11:00 · 1,053 · 1,053 recorded · 1,050 measured · Source: the US BTS 12:00 · 451 · 451 recorded · 449 measured · Source: the US BTS 13:00 · 591 · 591 recorded · 590 measured · Source: the US BTS 14:00 · 216 · 216 recorded · 215 measured · Source: the US BTS 15:00 · 693 · 693 recorded · 690 measured · Source: the US BTS 16:00 · 1,047 · 1,047 recorded · 1,041 measured · Source: the US BTS 17:00 · 253 · 253 recorded · 252 measured · Source: the US BTS 18:00 · 290 · 290 recorded · 290 measured · Source: the US BTS 19:00 · 671 · 671 recorded · 661 measured · Source: the US BTS 20:00 · 87 · 87 recorded · 87 measured · Source: the US BTS 21:00 · 805 · 805 recorded · 799 measured · Source: the US BTS 22:00 · 358 · 358 recorded · 355 measured · Source: the US BTS 23:00 · 811 · 811 recorded · 804 measured · Source: the US BTS

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View the figures
Departure hourOn-time departuresAverage departure delayWith departure timeRecorded flights
00:00No observations———
01:00No observations———
02:00No observations———
03:00No observations———
04:00No observations———
05:00No observations———
06:0090.8%4.2 min778781
07:0087.9%10.1 min1,5491,561
08:0081.6%14.7 min565572
09:0083.3%7.9 min1,3021,307
10:00Fewer than 200 measured departures—115115
11:0081.9%11.2 min1,0501,053
12:0084.0%7.6 min449451
13:0086.8%9.8 min590591
14:0080.5%6.6 min215216
15:0082.8%12.8 min690693
16:0078.4%11.6 min1,0411,047
17:0072.6%18.3 min252253
18:0075.5%18.0 min290290
19:0067.6%18.5 min661671
20:00Fewer than 200 measured departures—8787
21:0077.9%13.5 min799805
22:0079.2%10.5 min355358
23:0078.1%14.6 min804811

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 80.7% · 1,724 recorded · 1,712 measured · Source: the US BTS Tuesday · 82.7% · 1,581 recorded · 1,578 measured · Source: the US BTS Wednesday · 84.2% · 1,590 recorded · 1,586 measured · Source: the US BTS Thursday · 83.5% · 1,713 recorded · 1,707 measured · Source: the US BTS Friday · 80.0% · 1,729 recorded · 1,707 measured · Source: the US BTS Saturday · 81.9% · 1,586 recorded · 1,572 measured · Source: the US BTS Sunday · 78.6% · 1,739 recorded · 1,730 measured · Source: the US BTS

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Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Monday · 10.5 min · 1,724 recorded · 1,712 measured · Source: the US BTS Tuesday · 12.1 min · 1,581 recorded · 1,578 measured · Source: the US BTS Wednesday · 8.8 min · 1,590 recorded · 1,586 measured · Source: the US BTS Thursday · 9.0 min · 1,713 recorded · 1,707 measured · Source: the US BTS Friday · 13.0 min · 1,729 recorded · 1,707 measured · Source: the US BTS Saturday · 10.2 min · 1,586 recorded · 1,572 measured · Source: the US BTS Sunday · 15.6 min · 1,739 recorded · 1,730 measured · Source: the US BTS

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Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Monday · 1,724 · 1,724 recorded · 1,712 measured · Source: the US BTS Tuesday · 1,581 · 1,581 recorded · 1,578 measured · Source: the US BTS Wednesday · 1,590 · 1,590 recorded · 1,586 measured · Source: the US BTS Thursday · 1,713 · 1,713 recorded · 1,707 measured · Source: the US BTS Friday · 1,729 · 1,729 recorded · 1,707 measured · Source: the US BTS Saturday · 1,586 · 1,586 recorded · 1,572 measured · Source: the US BTS Sunday · 1,739 · 1,739 recorded · 1,730 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday80.7%10.5 min1,7121,724
Tuesday82.7%12.1 min1,5781,581
Wednesday84.2%8.8 min1,5861,590
Thursday83.5%9.0 min1,7071,713
Friday80.0%13.0 min1,7071,729
Saturday81.9%10.2 min1,5721,586
Sunday78.6%15.6 min1,7301,739

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 · 78.9% · 857 recorded · 838 measured · Source: the US BTS Feb · 82.1% · 752 recorded · 750 measured · Source: the US BTS Mar · 80.7% · 910 recorded · 903 measured · Source: the US BTS Apr · 86.0% · 990 recorded · 983 measured · Source: the US BTS May · 81.1% · 1,177 recorded · 1,177 measured · Source: the US BTS Jun · 79.4% · 1,306 recorded · 1,297 measured · Source: the US BTS Jul · 76.6% · 1,390 recorded · 1,382 measured · Source: the US BTS Aug · 80.1% · 631 recorded · 629 measured · Source: the US BTS Sep · 90.8% · 567 recorded · 567 measured · Source: the US BTS Oct · 85.7% · 965 recorded · 959 measured · Source: the US BTS Nov · 88.7% · 1,039 recorded · 1,036 measured · Source: the US BTS Dec · 75.4% · 1,078 recorded · 1,071 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 · 14.9 min · 857 recorded · 838 measured · Source: the US BTS Feb · 14.3 min · 752 recorded · 750 measured · Source: the US BTS Mar · 9.5 min · 910 recorded · 903 measured · Source: the US BTS Apr · 6.1 min · 990 recorded · 983 measured · Source: the US BTS May · 11.2 min · 1,177 recorded · 1,177 measured · Source: the US BTS Jun · 14.0 min · 1,306 recorded · 1,297 measured · Source: the US BTS Jul · 16.3 min · 1,390 recorded · 1,382 measured · Source: the US BTS Aug · 11.5 min · 631 recorded · 629 measured · Source: the US BTS Sep · 7.4 min · 567 recorded · 567 measured · Source: the US BTS Oct · 8.0 min · 965 recorded · 959 measured · Source: the US BTS Nov · 4.8 min · 1,039 recorded · 1,036 measured · Source: the US BTS Dec · 14.9 min · 1,078 recorded · 1,071 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 · 857 · 857 recorded · 838 measured · Source: the US BTS Feb · 752 · 752 recorded · 750 measured · Source: the US BTS Mar · 910 · 910 recorded · 903 measured · Source: the US BTS Apr · 990 · 990 recorded · 983 measured · Source: the US BTS May · 1,177 · 1,177 recorded · 1,177 measured · Source: the US BTS Jun · 1,306 · 1,306 recorded · 1,297 measured · Source: the US BTS Jul · 1,390 · 1,390 recorded · 1,382 measured · Source: the US BTS Aug · 631 · 631 recorded · 629 measured · Source: the US BTS Sep · 567 · 567 recorded · 567 measured · Source: the US BTS Oct · 965 · 965 recorded · 959 measured · Source: the US BTS Nov · 1,039 · 1,039 recorded · 1,036 measured · Source: the US BTS Dec · 1,078 · 1,078 recorded · 1,071 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan78.9%14.9 min838857
Feb82.1%14.3 min750752
Mar80.7%9.5 min903910
Apr86.0%6.1 min983990
May81.1%11.2 min1,1771,177
Jun79.4%14.0 min1,2971,306
Jul76.6%16.3 min1,3821,390
Aug80.1%11.5 min629631
Sep90.8%7.4 min567567
Oct85.7%8.0 min959965
Nov88.7%4.8 min1,0361,039
Dec75.4%14.9 min1,0711,078

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 81.1% 9,461
  • Delayed >15 min 18.3% 2,131
  • Cancelled 0.6% 70
  • 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

40
40 of 40
Flight numbersBy direction DeparturesOn time
DL774 ATL → SEA 658 86.1%
DL569 SEA → ATL 657 91.1%
DL444 ATL → SEA 654 87.6%
DL562 SEA → ATL 653 86.4%
DL629 ATL → SEA 643 84.1%
DL542 SEA → ATL 628 81.9%
DL481 ATL → SEA 594 85.0%
AS377 ATL → SEA 588 83.6%
DL652 SEA → ATL 584 80.5%
DL560 SEA → ATL 560 83.0%
DL554 SEA → ATL 497 81.7%
DL567 SEA → ATL 444 82.3%
AS334 SEA → ATL 440 79.0%
AS492 SEA → ATL 417 73.6%
DL903 ATL → SEA 398 75.6%
DL472 ATL → SEA 381 75.0%
DL714 ATL → SEA 341 76.5%
AS727 SEA → ATL 258 75.7%
AS533 ATL → SEA 235 82.4%
AS464 SEA → ATL 228 79.7%
AS376 SEA → ATL 181 88.9%
DL648 ATL → SEA 175 86.3%
AS497 ATL → SEA 167 75.2%
AS348 ATL → SEA 129 70.1%
AS124 ATL → SEA 112 83.6%
AS334 ATL → SEA 91 40.5%
DL797 SEA → ATL 88 80.5%
DL727 ATL → SEA 68 82.4%
DL814 ATL → SEA 67 85.1%
AS321 ATL → SEA 65 69.2%
DL623 ATL → SEA 60 62.1%
DL2116 ATL → SEA 55 78.2%
AS218 ATL → SEA 51 68.0%
AS263 ATL → SEA 49 77.1%
AS335 ATL → SEA 45 82.2%
DL834 ATL → SEA 45 60.0%
DL967 SEA → ATL 36 69.4%
DL552 SEA → ATL 34 75.8%
DL675 ATL → SEA 34 85.3%
DL1687 ATL → SEA 32 96.9%

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 692 +0.3% 4 76.9%
June 2026 648 −0.2% 1 84.9%
May 2026 594 +1.9% 0 81.0%
April 2026 500 +3.5% 3 87.2%
March 2026 457 +2.5% 6 76.1%
February 2026 382 +3.8% 2 85.9%
January 2026 422 +1.4% 5 82.9%
December 2025 531 −1.7% 7 70.6%
November 2025 510 −3.0% 3 86.7%
October 2025 584 +55.7% 6 84.2%
September 2025 567 0 90.8%
August 2025 629 2 80.1%
July 2025 690 4 76.4%
June 2025 649 8 74.0%
May 2025 583 0 81.1%
April 2025 483 4 84.7%
March 2025 446 1 85.4%
February 2025 368 0 78.3%
January 2025 416 14 74.8%
December 2024 540 0 80.0%
November 2024 526 0 90.7%
October 2024 375 0 88.0%

How to read this chart

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