Countries › United States › Seattle › SEA Seattle–Tacoma (SEA) SEA / KSEA
4,477,011
Seattle–Tacoma International Airport handled 4,477,011 passengers in May 2026, down 0.5% on a year earlier, according to US Bureau of Transportation Statistics — T-100 Air Carrier Statistics .
Full count · domestic + international Flight timing & delays ↓
Passengers over time Showing 53 months. Full series runs 1990–2026 (437 periods).
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Domestic / International May 2026 Domestic 87.2% 3,904,722 International 12.8% 572,289 Against 2019 +2.9% same month, before the pandemic
International share 13% of passengers in May 2026
Series depth 36 years from 1990
The most recent periods Open any period for the full breakdown. As published Newest first Oldest first Highest first Lowest first 24 of 24
Period Passengers Year on year Source May 2026 4,477,011 −0.5% US Bureau of Transportation Statistics Open this month → April 2026 3,883,105 −2.5% US Bureau of Transportation Statistics Open this month → March 2026 3,849,910 −0.9% US Bureau of Transportation Statistics Open this month → February 2026 3,260,226 +0.8% US Bureau of Transportation Statistics Open this month → January 2026 3,427,990 −2.5% US Bureau of Transportation Statistics Open this month → December 2025 3,992,204 −2.8% US Bureau of Transportation Statistics Open this month → November 2025 3,622,898 −3.1% US Bureau of Transportation Statistics Open this month → October 2025 4,152,782 −2.5% US Bureau of Transportation Statistics Open this month → September 2025 4,408,118 −3.9% US Bureau of Transportation Statistics Open this month → August 2025 5,258,171 −0.2% US Bureau of Transportation Statistics Open this month → July 2025 5,386,363 +0.9% US Bureau of Transportation Statistics Open this month → June 2025 4,973,538 +0.4% US Bureau of Transportation Statistics Open this month → May 2025 4,500,425 +0.2% US Bureau of Transportation Statistics Open this month → April 2025 3,980,701 +1.8% US Bureau of Transportation Statistics Open this month → March 2025 3,884,804 +0.4% US Bureau of Transportation Statistics Open this month → February 2025 3,234,766 −0.5% US Bureau of Transportation Statistics Open this month → January 2025 3,515,457 +9.4% US Bureau of Transportation Statistics Open this month → December 2024 4,105,361 +8.3% US Bureau of Transportation Statistics Open this month → November 2024 3,740,162 −2.5% US Bureau of Transportation Statistics Open this month → October 2024 4,260,859 +1.3% US Bureau of Transportation Statistics Open this month → September 2024 4,589,260 +4.2% US Bureau of Transportation Statistics Open this month → August 2024 5,268,879 +5.4% US Bureau of Transportation Statistics July 2024 5,338,705 +4.3% US Bureau of Transportation Statistics June 2024 4,951,557 +5.0% US Bureau of Transportation Statistics
Also tracked here: aircraft movements (through May 2026), tonnes of cargo (through May 2026).
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.
US domestic sectors recorded by BTS Source: BTS · US Department of Transportation · 2024-09-01 → 2026-06-30
Lowest average delay 05:00–06:00 1.9min · 4,678 recorded · 4,645 measured
Gap to highest-delay hour 11.3min 05:00 ↔ 20:00
Recorded flights 297,039 Seattle–Tacoma International Airport
Departure hour Day of week Month of year
Departure hour On-time departures 100.0 50.0 0.0
00:00 · 79.0% · 1,329 recorded · 1,311 measured · Source: BTS · US Department of Transportation 01:00 · Fewer than 200 measured departures · 92 recorded · 91 measured · Source: BTS · US Department of Transportation 02:00 · No observations · 0 recorded · 0 measured · Source: BTS · US Department of Transportation 03:00 · No observations · 0 recorded · 0 measured · Source: BTS · US Department of Transportation 04:00 · No observations · 0 recorded · 0 measured · Source: BTS · US Department of Transportation 05:00 · 94.5% · 4,678 recorded · 4,645 measured · Source: BTS · US Department of Transportation 06:00 · 92.5% · 9,963 recorded · 9,869 measured · Source: BTS · US Department of Transportation 07:00 · 90.1% · 24,175 recorded · 23,947 measured · Source: BTS · US Department of Transportation 08:00 · 88.5% · 21,943 recorded · 21,717 measured · Source: BTS · US Department of Transportation 09:00 · 84.7% · 22,084 recorded · 21,921 measured · Source: BTS · US Department of Transportation 10:00 · 78.9% · 18,176 recorded · 18,044 measured · Source: BTS · US Department of Transportation 11:00 · 75.5% · 26,946 recorded · 26,758 measured · Source: BTS · US Department of Transportation 12:00 · 78.5% · 13,770 recorded · 13,674 measured · Source: BTS · US Department of Transportation 13:00 · 79.4% · 16,886 recorded · 16,791 measured · Source: BTS · US Department of Transportation 14:00 · 78.8% · 10,371 recorded · 10,300 measured · Source: BTS · US Department of Transportation 15:00 · 78.1% · 20,623 recorded · 20,465 measured · Source: BTS · US Department of Transportation 16:00 · 77.5% · 9,395 recorded · 9,325 measured · Source: BTS · US Department of Transportation 17:00 · 77.7% · 20,738 recorded · 20,586 measured · Source: BTS · US Department of Transportation 18:00 · 76.6% · 12,593 recorded · 12,498 measured · Source: BTS · US Department of Transportation 19:00 · 79.7% · 17,634 recorded · 17,542 measured · Source: BTS · US Department of Transportation 20:00 · 72.7% · 9,002 recorded · 8,943 measured · Source: BTS · US Department of Transportation 21:00 · 77.9% · 15,380 recorded · 15,241 measured · Source: BTS · US Department of Transportation 22:00 · 74.3% · 9,696 recorded · 9,623 measured · Source: BTS · US Department of Transportation 23:00 · 77.7% · 11,565 recorded · 11,434 measured · Source: BTS · US Department of Transportation 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
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Average departure delay 13.2 6.6 0.0
00:00 · 11.8 min · 1,329 recorded · 1,311 measured · Source: BTS · US Department of Transportation 01:00 · Fewer than 200 measured departures · 92 recorded · 91 measured · Source: BTS · US Department of Transportation 02:00 · No observations · 0 recorded · 0 measured · Source: BTS · US Department of Transportation 03:00 · No observations · 0 recorded · 0 measured · Source: BTS · US Department of Transportation 04:00 · No observations · 0 recorded · 0 measured · Source: BTS · US Department of Transportation 05:00 · 1.9 min · 4,678 recorded · 4,645 measured · Source: BTS · US Department of Transportation 06:00 · 2.9 min · 9,963 recorded · 9,869 measured · Source: BTS · US Department of Transportation 07:00 · 4.5 min · 24,175 recorded · 23,947 measured · Source: BTS · US Department of Transportation 08:00 · 4.3 min · 21,943 recorded · 21,717 measured · Source: BTS · US Department of Transportation 09:00 · 6.0 min · 22,084 recorded · 21,921 measured · Source: BTS · US Department of Transportation 10:00 · 10.2 min · 18,176 recorded · 18,044 measured · Source: BTS · US Department of Transportation 11:00 · 11.8 min · 26,946 recorded · 26,758 measured · Source: BTS · US Department of Transportation 12:00 · 10.0 min · 13,770 recorded · 13,674 measured · Source: BTS · US Department of Transportation 13:00 · 10.3 min · 16,886 recorded · 16,791 measured · Source: BTS · US Department of Transportation 14:00 · 10.9 min · 10,371 recorded · 10,300 measured · Source: BTS · US Department of Transportation 15:00 · 11.3 min · 20,623 recorded · 20,465 measured · Source: BTS · US Department of Transportation 16:00 · 10.3 min · 9,395 recorded · 9,325 measured · Source: BTS · US Department of Transportation 17:00 · 11.5 min · 20,738 recorded · 20,586 measured · Source: BTS · US Department of Transportation 18:00 · 11.2 min · 12,593 recorded · 12,498 measured · Source: BTS · US Department of Transportation 19:00 · 9.1 min · 17,634 recorded · 17,542 measured · Source: BTS · US Department of Transportation 20:00 · 13.2 min · 9,002 recorded · 8,943 measured · Source: BTS · US Department of Transportation 21:00 · 10.1 min · 15,380 recorded · 15,241 measured · Source: BTS · US Department of Transportation 22:00 · 12.1 min · 9,696 recorded · 9,623 measured · Source: BTS · US Department of Transportation 23:00 · 10.6 min · 11,565 recorded · 11,434 measured · Source: BTS · US Department of Transportation 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
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Recorded flights 26,946 13,473 0
00:00 · 1,329 · 1,329 recorded · 1,311 measured · Source: BTS · US Department of Transportation 01:00 · 92 · 92 recorded · 91 measured · Source: BTS · US Department of Transportation 02:00 · No observations · 0 recorded · 0 measured · Source: BTS · US Department of Transportation 03:00 · No observations · 0 recorded · 0 measured · Source: BTS · US Department of Transportation 04:00 · No observations · 0 recorded · 0 measured · Source: BTS · US Department of Transportation 05:00 · 4,678 · 4,678 recorded · 4,645 measured · Source: BTS · US Department of Transportation 06:00 · 9,963 · 9,963 recorded · 9,869 measured · Source: BTS · US Department of Transportation 07:00 · 24,175 · 24,175 recorded · 23,947 measured · Source: BTS · US Department of Transportation 08:00 · 21,943 · 21,943 recorded · 21,717 measured · Source: BTS · US Department of Transportation 09:00 · 22,084 · 22,084 recorded · 21,921 measured · Source: BTS · US Department of Transportation 10:00 · 18,176 · 18,176 recorded · 18,044 measured · Source: BTS · US Department of Transportation 11:00 · 26,946 · 26,946 recorded · 26,758 measured · Source: BTS · US Department of Transportation 12:00 · 13,770 · 13,770 recorded · 13,674 measured · Source: BTS · US Department of Transportation 13:00 · 16,886 · 16,886 recorded · 16,791 measured · Source: BTS · US Department of Transportation 14:00 · 10,371 · 10,371 recorded · 10,300 measured · Source: BTS · US Department of Transportation 15:00 · 20,623 · 20,623 recorded · 20,465 measured · Source: BTS · US Department of Transportation 16:00 · 9,395 · 9,395 recorded · 9,325 measured · Source: BTS · US Department of Transportation 17:00 · 20,738 · 20,738 recorded · 20,586 measured · Source: BTS · US Department of Transportation 18:00 · 12,593 · 12,593 recorded · 12,498 measured · Source: BTS · US Department of Transportation 19:00 · 17,634 · 17,634 recorded · 17,542 measured · Source: BTS · US Department of Transportation 20:00 · 9,002 · 9,002 recorded · 8,943 measured · Source: BTS · US Department of Transportation 21:00 · 15,380 · 15,380 recorded · 15,241 measured · Source: BTS · US Department of Transportation 22:00 · 9,696 · 9,696 recorded · 9,623 measured · Source: BTS · US Department of Transportation 23:00 · 11,565 · 11,565 recorded · 11,434 measured · Source: BTS · US Department of Transportation 00:00 03:00 06:00 09:00 12:00 15:00 18:00 21:00
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View the figures Departure hour On-time departures Average departure delay With departure time Recorded flights 00:00 79.0% 11.8 min 1,311 1,329 01:00 Fewer than 200 measured departures — 91 92 02:00 No observations — — — 03:00 No observations — — — 04:00 No observations — — — 05:00 94.5% 1.9 min 4,645 4,678 06:00 92.5% 2.9 min 9,869 9,963 07:00 90.1% 4.5 min 23,947 24,175 08:00 88.5% 4.3 min 21,717 21,943 09:00 84.7% 6.0 min 21,921 22,084 10:00 78.9% 10.2 min 18,044 18,176 11:00 75.5% 11.8 min 26,758 26,946 12:00 78.5% 10.0 min 13,674 13,770 13:00 79.4% 10.3 min 16,791 16,886 14:00 78.8% 10.9 min 10,300 10,371 15:00 78.1% 11.3 min 20,465 20,623 16:00 77.5% 10.3 min 9,325 9,395 17:00 77.7% 11.5 min 20,586 20,738 18:00 76.6% 11.2 min 12,498 12,593 19:00 79.7% 9.1 min 17,542 17,634 20:00 72.7% 13.2 min 8,943 9,002 21:00 77.9% 10.1 min 15,241 15,380 22:00 74.3% 12.1 min 9,623 9,696 23:00 77.7% 10.6 min 11,434 11,565
Day of week On-time departures 100.0 50.0 0.0
Monday · 79.8% · 44,795 recorded · 44,443 measured · Source: BTS · US Department of Transportation Tuesday · 84.4% · 41,101 recorded · 40,908 measured · Source: BTS · US Department of Transportation Wednesday · 83.4% · 40,792 recorded · 40,572 measured · Source: BTS · US Department of Transportation Thursday · 79.3% · 43,722 recorded · 43,387 measured · Source: BTS · US Department of Transportation Friday · 78.5% · 43,969 recorded · 43,488 measured · Source: BTS · US Department of Transportation Saturday · 81.8% · 38,476 recorded · 38,186 measured · Source: BTS · US Department of Transportation Sunday · 78.0% · 44,184 recorded · 43,741 measured · Source: BTS · US Department of Transportation Mon Tue Wed Thu Fri Sat Sun
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Average departure delay 11.1 5.6 0.0
Monday · 9.7 min · 44,795 recorded · 44,443 measured · Source: BTS · US Department of Transportation Tuesday · 6.2 min · 41,101 recorded · 40,908 measured · Source: BTS · US Department of Transportation Wednesday · 7.2 min · 40,792 recorded · 40,572 measured · Source: BTS · US Department of Transportation Thursday · 9.9 min · 43,722 recorded · 43,387 measured · Source: BTS · US Department of Transportation Friday · 10.7 min · 43,969 recorded · 43,488 measured · Source: BTS · US Department of Transportation Saturday · 8.4 min · 38,476 recorded · 38,186 measured · Source: BTS · US Department of Transportation Sunday · 11.1 min · 44,184 recorded · 43,741 measured · Source: BTS · US Department of Transportation Mon Tue Wed Thu Fri Sat Sun
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Recorded flights 44,795 22,398 0
Monday · 44,795 · 44,795 recorded · 44,443 measured · Source: BTS · US Department of Transportation Tuesday · 41,101 · 41,101 recorded · 40,908 measured · Source: BTS · US Department of Transportation Wednesday · 40,792 · 40,792 recorded · 40,572 measured · Source: BTS · US Department of Transportation Thursday · 43,722 · 43,722 recorded · 43,387 measured · Source: BTS · US Department of Transportation Friday · 43,969 · 43,969 recorded · 43,488 measured · Source: BTS · US Department of Transportation Saturday · 38,476 · 38,476 recorded · 38,186 measured · Source: BTS · US Department of Transportation Sunday · 44,184 · 44,184 recorded · 43,741 measured · Source: BTS · US Department of Transportation Mon Tue Wed Thu Fri Sat Sun
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View the figures Day of week On-time departures Average departure delay With departure time Recorded flights Monday 79.8% 9.7 min 44,443 44,795 Tuesday 84.4% 6.2 min 40,908 41,101 Wednesday 83.4% 7.2 min 40,572 40,792 Thursday 79.3% 9.9 min 43,387 43,722 Friday 78.5% 10.7 min 43,488 43,969 Saturday 81.8% 8.4 min 38,186 38,476 Sunday 78.0% 11.1 min 43,741 44,184
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 100.0 50.0 0.0
Jan · 82.3% · 23,809 recorded · 23,472 measured · Source: BTS · US Department of Transportation Feb · 82.3% · 21,738 recorded · 21,515 measured · Source: BTS · US Department of Transportation Mar · 80.4% · 25,407 recorded · 25,076 measured · Source: BTS · US Department of Transportation Apr · 84.6% · 25,580 recorded · 25,535 measured · Source: BTS · US Department of Transportation May · 81.2% · 29,194 recorded · 29,081 measured · Source: BTS · US Department of Transportation Jun · 74.2% · 31,097 recorded · 30,925 measured · Source: BTS · US Department of Transportation Jul · 73.1% · 16,577 recorded · 16,349 measured · Source: BTS · US Department of Transportation Aug · 76.2% · 15,970 recorded · 15,864 measured · Source: BTS · US Department of Transportation Sep · 83.2% · 29,357 recorded · 29,267 measured · Source: BTS · US Department of Transportation Oct · 84.7% · 27,622 recorded · 27,408 measured · Source: BTS · US Department of Transportation Nov · 85.6% · 25,069 recorded · 24,810 measured · Source: BTS · US Department of Transportation Dec · 77.0% · 25,619 recorded · 25,423 measured · Source: BTS · US Department of Transportation Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
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Average departure delay 15.4 7.7 0.0
Jan · 8.7 min · 23,809 recorded · 23,472 measured · Source: BTS · US Department of Transportation Feb · 8.3 min · 21,738 recorded · 21,515 measured · Source: BTS · US Department of Transportation Mar · 9.5 min · 25,407 recorded · 25,076 measured · Source: BTS · US Department of Transportation Apr · 6.1 min · 25,580 recorded · 25,535 measured · Source: BTS · US Department of Transportation May · 8.1 min · 29,194 recorded · 29,081 measured · Source: BTS · US Department of Transportation Jun · 13.3 min · 31,097 recorded · 30,925 measured · Source: BTS · US Department of Transportation Jul · 15.4 min · 16,577 recorded · 16,349 measured · Source: BTS · US Department of Transportation Aug · 11.8 min · 15,970 recorded · 15,864 measured · Source: BTS · US Department of Transportation Sep · 6.6 min · 29,357 recorded · 29,267 measured · Source: BTS · US Department of Transportation Oct · 6.2 min · 27,622 recorded · 27,408 measured · Source: BTS · US Department of Transportation Nov · 5.7 min · 25,069 recorded · 24,810 measured · Source: BTS · US Department of Transportation Dec · 12.3 min · 25,619 recorded · 25,423 measured · Source: BTS · US Department of Transportation Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
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Recorded flights 31,097 15,549 0
Jan · 23,809 · 23,809 recorded · 23,472 measured · Source: BTS · US Department of Transportation Feb · 21,738 · 21,738 recorded · 21,515 measured · Source: BTS · US Department of Transportation Mar · 25,407 · 25,407 recorded · 25,076 measured · Source: BTS · US Department of Transportation Apr · 25,580 · 25,580 recorded · 25,535 measured · Source: BTS · US Department of Transportation May · 29,194 · 29,194 recorded · 29,081 measured · Source: BTS · US Department of Transportation Jun · 31,097 · 31,097 recorded · 30,925 measured · Source: BTS · US Department of Transportation Jul · 16,577 · 16,577 recorded · 16,349 measured · Source: BTS · US Department of Transportation Aug · 15,970 · 15,970 recorded · 15,864 measured · Source: BTS · US Department of Transportation Sep · 29,357 · 29,357 recorded · 29,267 measured · Source: BTS · US Department of Transportation Oct · 27,622 · 27,622 recorded · 27,408 measured · Source: BTS · US Department of Transportation Nov · 25,069 · 25,069 recorded · 24,810 measured · Source: BTS · US Department of Transportation Dec · 25,619 · 25,619 recorded · 25,423 measured · Source: BTS · US Department of Transportation Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
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View the figures Month of year On-time departures Average departure delay With departure time Recorded flights Jan 82.3% 8.7 min 23,472 23,809 Feb 82.3% 8.3 min 21,515 21,738 Mar 80.4% 9.5 min 25,076 25,407 Apr 84.6% 6.1 min 25,535 25,580 May 81.2% 8.1 min 29,081 29,194 Jun 74.2% 13.3 min 30,925 31,097 Jul 73.1% 15.4 min 16,349 16,577 Aug 76.2% 11.8 min 15,864 15,970 Sep 83.2% 6.6 min 29,267 29,357 Oct 84.7% 6.2 min 27,408 27,622 Nov 85.6% 5.7 min 24,810 25,069 Dec 77.0% 12.3 min 25,423 25,619
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 80.0% 237,728 Delayed >15 min 19.2% 56,997 Cancelled 0.8% 2,314 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 punctuality and average delay.
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