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641 km · Domestic

Boise Air Terminal/Gowen Field (BOI) – Seattle–Tacoma (SEA)

In July 2026, 606 flights operated between Boise Air Terminal/Gowen Field and Seattle–Tacoma (both directions), and 84.5% 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
January619590▼ 4.7%
February563587▲ 4.3%
March666727▲ 9.2%
April688710▲ 3.2%
May650729▲ 12.2%
June705624▼ 11.5%
July754606▼ 19.6%
August719––
September662––
October633–in progress
November528––
December504––
Year to date (Jan–Jul)4,6454,573▼ 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
January86.3%87.6%▲ 1.5%
February77.4%89.9%▲ 16.1%
March87.1%87.5%▲ 0.5%
April88.8%90.3%▲ 1.7%
May90.2%89.7%▼ 0.6%
June81.8%85.7%▲ 4.8%
July84.9%84.5%▼ 0.5%
August85.7%––
September90.0%––
October90.5%–in progress
November90.7%––
December87.3%––
Year-to-date average (Jan–Jul)85.2%87.9%▲ 3.1%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January220.0%
February50▼ 100.0%
March211▲ 450.0%
April01–
May00–
June20▼ 100.0%
July20▼ 100.0%
August0––
September2––
October1–in progress
November6––
December0––
Year to date (Jan–Jul)1314▲ 7.7%

Airlines on this route

  1. SkyWest Airlines 78.0%
  2. Alaska Airlines 22.0%

Oct 1, 2024 – Jul 31, 2026

By direction

BOI → SEA

Scheduled flights
6,764
Flights operated
6,739
Cancelled
25 · 0.4%
On-time departures
89.8%

SEA → BOI

Scheduled flights
6,964
Flights operated
6,945
Cancelled
19 · 0.3%
On-time departures
85.1%

BOI → SEA and SEA → BOI counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
SkyWest Airlines OO 10,710 78.0% 89.2% 27
Alaska Airlines AS 3,018 22.0% 81.3% 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 delay05:00–06:00-2.7min · 596 recorded · 595 measured
Gap to highest-delay hour15.6min05:00 ↔ 20:00
Recorded flights13,728BOI–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 · 96.8% · 596 recorded · 595 measured · Source: the US BTS 06:00 · 96.8% · 556 recorded · 553 measured · Source: the US BTS 07:00 · 94.3% · 1,291 recorded · 1,289 measured · Source: the US BTS 08:00 · 92.9% · 665 recorded · 664 measured · Source: the US BTS 09:00 · 91.7% · 818 recorded · 810 measured · Source: the US BTS 10:00 · 90.3% · 1,031 recorded · 1,028 measured · Source: the US BTS 11:00 · 84.7% · 782 recorded · 779 measured · Source: the US BTS 12:00 · 79.3% · 593 recorded · 593 measured · Source: the US BTS 13:00 · 87.9% · 1,160 recorded · 1,156 measured · Source: the US BTS 14:00 · 82.0% · 798 recorded · 795 measured · Source: the US BTS 15:00 · 86.2% · 434 recorded · 434 measured · Source: the US BTS 16:00 · 86.4% · 845 recorded · 843 measured · Source: the US BTS 17:00 · 87.1% · 939 recorded · 938 measured · Source: the US BTS 18:00 · 83.1% · 703 recorded · 700 measured · Source: the US BTS 19:00 · 85.8% · 1,214 recorded · 1,209 measured · Source: the US BTS 20:00 · 71.1% · 598 recorded · 595 measured · Source: the US BTS 21:00 · 84.1% · 705 recorded · 703 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 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
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 · -2.7 min · 596 recorded · 595 measured · Source: the US BTS 06:00 · -2.3 min · 556 recorded · 553 measured · Source: the US BTS 07:00 · -2.3 min · 1,291 recorded · 1,289 measured · Source: the US BTS 08:00 · -0.9 min · 665 recorded · 664 measured · Source: the US BTS 09:00 · 0.9 min · 818 recorded · 810 measured · Source: the US BTS 10:00 · 1.9 min · 1,031 recorded · 1,028 measured · Source: the US BTS 11:00 · 5.6 min · 782 recorded · 779 measured · Source: the US BTS 12:00 · 9.4 min · 593 recorded · 593 measured · Source: the US BTS 13:00 · 3.6 min · 1,160 recorded · 1,156 measured · Source: the US BTS 14:00 · 6.8 min · 798 recorded · 795 measured · Source: the US BTS 15:00 · 2.6 min · 434 recorded · 434 measured · Source: the US BTS 16:00 · 2.8 min · 845 recorded · 843 measured · Source: the US BTS 17:00 · 3.0 min · 939 recorded · 938 measured · Source: the US BTS 18:00 · 6.8 min · 703 recorded · 700 measured · Source: the US BTS 19:00 · 3.8 min · 1,214 recorded · 1,209 measured · Source: the US BTS 20:00 · 12.9 min · 598 recorded · 595 measured · Source: the US BTS 21:00 · 6.7 min · 705 recorded · 703 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 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 · 596 · 596 recorded · 595 measured · Source: the US BTS 06:00 · 556 · 556 recorded · 553 measured · Source: the US BTS 07:00 · 1,291 · 1,291 recorded · 1,289 measured · Source: the US BTS 08:00 · 665 · 665 recorded · 664 measured · Source: the US BTS 09:00 · 818 · 818 recorded · 810 measured · Source: the US BTS 10:00 · 1,031 · 1,031 recorded · 1,028 measured · Source: the US BTS 11:00 · 782 · 782 recorded · 779 measured · Source: the US BTS 12:00 · 593 · 593 recorded · 593 measured · Source: the US BTS 13:00 · 1,160 · 1,160 recorded · 1,156 measured · Source: the US BTS 14:00 · 798 · 798 recorded · 795 measured · Source: the US BTS 15:00 · 434 · 434 recorded · 434 measured · Source: the US BTS 16:00 · 845 · 845 recorded · 843 measured · Source: the US BTS 17:00 · 939 · 939 recorded · 938 measured · Source: the US BTS 18:00 · 703 · 703 recorded · 700 measured · Source: the US BTS 19:00 · 1,214 · 1,214 recorded · 1,209 measured · Source: the US BTS 20:00 · 598 · 598 recorded · 595 measured · Source: the US BTS 21:00 · 705 · 705 recorded · 703 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 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———
05:0096.8%-2.7 min595596
06:0096.8%-2.3 min553556
07:0094.3%-2.3 min1,2891,291
08:0092.9%-0.9 min664665
09:0091.7%0.9 min810818
10:0090.3%1.9 min1,0281,031
11:0084.7%5.6 min779782
12:0079.3%9.4 min593593
13:0087.9%3.6 min1,1561,160
14:0082.0%6.8 min795798
15:0086.2%2.6 min434434
16:0086.4%2.8 min843845
17:0087.1%3.0 min938939
18:0083.1%6.8 min700703
19:0085.8%3.8 min1,2091,214
20:0071.1%12.9 min595598
21:0084.1%6.7 min703705
22:00No observations———
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 87.0% · 2,041 recorded · 2,035 measured · Source: the US BTS Tuesday · 90.3% · 1,923 recorded · 1,918 measured · Source: the US BTS Wednesday · 88.3% · 1,902 recorded · 1,896 measured · Source: the US BTS Thursday · 85.1% · 2,015 recorded · 2,012 measured · Source: the US BTS Friday · 87.1% · 2,012 recorded · 1,997 measured · Source: the US BTS Saturday · 89.1% · 1,848 recorded · 1,844 measured · Source: the US BTS Sunday · 85.4% · 1,987 recorded · 1,982 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 · 3.4 min · 2,041 recorded · 2,035 measured · Source: the US BTS Tuesday · 0.4 min · 1,923 recorded · 1,918 measured · Source: the US BTS Wednesday · 2.5 min · 1,902 recorded · 1,896 measured · Source: the US BTS Thursday · 6.1 min · 2,015 recorded · 2,012 measured · Source: the US BTS Friday · 4.1 min · 2,012 recorded · 1,997 measured · Source: the US BTS Saturday · 0.6 min · 1,848 recorded · 1,844 measured · Source: the US BTS Sunday · 5.0 min · 1,987 recorded · 1,982 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 · 2,041 · 2,041 recorded · 2,035 measured · Source: the US BTS Tuesday · 1,923 · 1,923 recorded · 1,918 measured · Source: the US BTS Wednesday · 1,902 · 1,902 recorded · 1,896 measured · Source: the US BTS Thursday · 2,015 · 2,015 recorded · 2,012 measured · Source: the US BTS Friday · 2,012 · 2,012 recorded · 1,997 measured · Source: the US BTS Saturday · 1,848 · 1,848 recorded · 1,844 measured · Source: the US BTS Sunday · 1,987 · 1,987 recorded · 1,982 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday87.0%3.4 min2,0352,041
Tuesday90.3%0.4 min1,9181,923
Wednesday88.3%2.5 min1,8961,902
Thursday85.1%6.1 min2,0122,015
Friday87.1%4.1 min1,9972,012
Saturday89.1%0.6 min1,8441,848
Sunday85.4%5.0 min1,9821,987

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 · 86.9% · 1,213 recorded · 1,209 measured · Source: the US BTS Feb · 83.8% · 1,155 recorded · 1,150 measured · Source: the US BTS Mar · 87.3% · 1,406 recorded · 1,393 measured · Source: the US BTS Apr · 89.6% · 1,399 recorded · 1,398 measured · Source: the US BTS May · 89.9% · 1,379 recorded · 1,379 measured · Source: the US BTS Jun · 83.7% · 1,331 recorded · 1,329 measured · Source: the US BTS Jul · 84.7% · 1,362 recorded · 1,360 measured · Source: the US BTS Aug · 85.7% · 719 recorded · 719 measured · Source: the US BTS Sep · 90.0% · 664 recorded · 662 measured · Source: the US BTS Oct · 91.1% · 1,019 recorded · 1,017 measured · Source: the US BTS Nov · 91.5% · 1,058 recorded · 1,052 measured · Source: the US BTS Dec · 86.2% · 1,023 recorded · 1,016 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
Jan · 3.9 min · 1,213 recorded · 1,209 measured · Source: the US BTS Feb · 4.8 min · 1,155 recorded · 1,150 measured · Source: the US BTS Mar · 3.3 min · 1,406 recorded · 1,393 measured · Source: the US BTS Apr · 1.1 min · 1,399 recorded · 1,398 measured · Source: the US BTS May · 1.4 min · 1,379 recorded · 1,379 measured · Source: the US BTS Jun · 4.9 min · 1,331 recorded · 1,329 measured · Source: the US BTS Jul · 5.5 min · 1,362 recorded · 1,360 measured · Source: the US BTS Aug · 3.9 min · 719 recorded · 719 measured · Source: the US BTS Sep · 0.2 min · 664 recorded · 662 measured · Source: the US BTS Oct · 1.7 min · 1,019 recorded · 1,017 measured · Source: the US BTS Nov · 0.8 min · 1,058 recorded · 1,052 measured · Source: the US BTS Dec · 5.8 min · 1,023 recorded · 1,016 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 · 1,213 · 1,213 recorded · 1,209 measured · Source: the US BTS Feb · 1,155 · 1,155 recorded · 1,150 measured · Source: the US BTS Mar · 1,406 · 1,406 recorded · 1,393 measured · Source: the US BTS Apr · 1,399 · 1,399 recorded · 1,398 measured · Source: the US BTS May · 1,379 · 1,379 recorded · 1,379 measured · Source: the US BTS Jun · 1,331 · 1,331 recorded · 1,329 measured · Source: the US BTS Jul · 1,362 · 1,362 recorded · 1,360 measured · Source: the US BTS Aug · 719 · 719 recorded · 719 measured · Source: the US BTS Sep · 664 · 664 recorded · 662 measured · Source: the US BTS Oct · 1,019 · 1,019 recorded · 1,017 measured · Source: the US BTS Nov · 1,058 · 1,058 recorded · 1,052 measured · Source: the US BTS Dec · 1,023 · 1,023 recorded · 1,016 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan86.9%3.9 min1,2091,213
Feb83.8%4.8 min1,1501,155
Mar87.3%3.3 min1,3931,406
Apr89.6%1.1 min1,3981,399
May89.9%1.4 min1,3791,379
Jun83.7%4.9 min1,3291,331
Jul84.7%5.5 min1,3601,362
Aug85.7%3.9 min719719
Sep90.0%0.2 min662664
Oct91.1%1.7 min1,0171,019
Nov91.5%0.8 min1,0521,058
Dec86.2%5.8 min1,0161,023

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 87.2% 11,964
  • Delayed >15 min 12.5% 1,720
  • Cancelled 0.3% 44
  • 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

75
75 of 75
Flight numbersBy direction DeparturesOn time
OO4127 SEA → BOI 658 87.5%
OO3775 BOI → SEA 650 96.8%
OO3688 SEA → BOI 641 87.3%
OO3678 BOI → SEA 627 94.9%
OO4127 BOI → SEA 623 87.9%
OO3740 BOI → SEA 619 92.2%
OO3692 SEA → BOI 618 85.6%
OO3750 SEA → BOI 520 94.4%
OO3688 BOI → SEA 470 87.2%
OO3817 SEA → BOI 454 89.6%
OO3750 BOI → SEA 423 94.3%
OO4090 SEA → BOI 413 88.1%
OO3959 SEA → BOI 393 90.1%
AS1018 SEA → BOI 379 70.8%
AS1034 SEA → BOI 377 72.5%
AS1019 BOI → SEA 366 77.8%
OO3959 BOI → SEA 315 92.7%
AS929 BOI → SEA 309 95.1%
AS345 BOI → SEA 195 94.3%
OO3594 SEA → BOI 195 94.4%
AS318 SEA → BOI 191 72.1%
OO3594 BOI → SEA 191 90.6%
OO3603 SEA → BOI 191 86.4%
AS467 SEA → BOI 190 80.0%
AS468 BOI → SEA 186 79.0%
OO3335 SEA → BOI 177 77.4%
OO3000 BOI → SEA 175 85.1%
OO3712 BOI → SEA 166 94.0%
OO3385 SEA → BOI 141 86.5%
OO3712 SEA → BOI 131 94.7%
OO3002 SEA → BOI 99 77.6%
OO3002 BOI → SEA 94 69.2%
OO3321 SEA → BOI 91 73.6%
AS248 SEA → BOI 79 87.3%
AS230 BOI → SEA 70 90.0%
AS737 BOI → SEA 69 98.5%
OO3440 SEA → BOI 69 88.4%
OO3448 BOI → SEA 69 76.5%
OO3678 SEA → BOI 55 94.6%
AS296 BOI → SEA 52 90.4%
AS423 BOI → SEA 52 96.2%
AS441 SEA → BOI 52 80.8%
AS740 BOI → SEA 52 73.1%
OO3321 BOI → SEA 51 94.0%
OO3958 BOI → SEA 50 84.0%
AS474 BOI → SEA 49 98.0%
AS550 SEA → BOI 48 75.0%
OO3347 BOI → SEA 45 68.2%
OO3347 SEA → BOI 45 71.1%
OO3405 BOI → SEA 44 93.2%
OO3278 SEA → BOI 38 92.1%
OO3407 BOI → SEA 38 76.3%
OO3460 SEA → BOI 38 89.5%
OO3987 BOI → SEA 38 92.1%
AS463 SEA → BOI 37 56.8%
AS233 SEA → BOI 36 86.1%
OO3039 SEA → BOI 36 94.3%
OO4108 SEA → BOI 36 83.3%
AS1439 SEA → BOI 35 80.0%
OO3038 BOI → SEA 35 91.2%
OO3065 BOI → SEA 35 97.1%
OO3066 BOI → SEA 35 91.4%
OO3067 SEA → BOI 35 94.3%
AS231 BOI → SEA 34 91.2%
AS429 SEA → BOI 34 91.2%
OO3041 SEA → BOI 34 58.8%
OO3225 BOI → SEA 34 90.9%
OO3042 BOI → SEA 33 93.9%
OO3256 SEA → BOI 33 93.9%
OO3462 SEA → BOI 33 87.9%
OO3305 BOI → SEA 32 68.8%
OO3305 SEA → BOI 32 81.3%
OO3817 BOI → SEA 31 87.1%
OO4157 BOI → SEA 31 87.1%
OO3629 BOI → SEA 30 90.0%

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 606 −19.6% 0 84.5%
June 2026 624 −11.5% 0 85.7%
May 2026 729 +12.2% 0 89.7%
April 2026 710 +3.2% 1 90.3%
March 2026 727 +9.2% 11 87.5%
February 2026 587 +4.3% 0 89.9%
January 2026 590 −4.7% 2 87.6%
December 2025 504 −1.6% 0 87.3%
November 2025 528 +0.8% 6 90.7%
October 2025 633 +64.8% 1 90.5%
September 2025 662 2 90.0%
August 2025 719 0 85.7%
July 2025 754 2 84.9%
June 2025 705 2 81.8%
May 2025 650 0 90.2%
April 2025 688 0 88.8%
March 2025 666 2 87.1%
February 2025 563 5 77.4%
January 2025 619 2 86.3%
December 2024 512 7 85.2%
November 2024 524 0 92.4%
October 2024 384 1 91.9%

How to read this chart

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