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995 km · Domestic

Seattle–Tacoma (SEA) – Charles M. Schulz Sonoma County (STS)

In July 2026, 122 flights operated between Seattle–Tacoma and Charles M. Schulz Sonoma County (both directions), and 77.0% 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
January4034▼ 15.0%
February3028▼ 6.7%
March2044▲ 120.0%
April2660▲ 130.8%
May11262▼ 44.6%
June11984▼ 29.4%
July121122▲ 0.8%
August122––
September120––
October67–in progress
November77––
December56––
Year to date (Jan–Jul)468434▼ 7.3%

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
January65.0%70.6%▲ 8.6%
February66.7%82.1%▲ 23.1%
March65.0%95.5%▲ 46.9%
April92.3%90.0%▼ 2.5%
May79.5%98.4%▲ 23.8%
June59.7%78.6%▲ 31.7%
July68.6%77.0%▲ 12.2%
August77.0%––
September80.0%––
October91.0%–in progress
November85.7%––
December58.9%––
Year-to-date average (Jan–Jul)71.0%84.6%▲ 19.2%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January06–
February21▼ 50.0%
March01–
April00–
May00–
June10▼ 100.0%
July10▼ 100.0%
August2––
September0––
October0–in progress
November1––
December4––
Year to date (Jan–Jul)48▲ 100.0%

Airlines on this route

  1. Alaska Airlines 66.0%
  2. SkyWest Airlines 34.0%

Oct 1, 2024 – Jul 31, 2026

By direction

SEA → STS

Scheduled flights
748
Flights operated
738
Cancelled
10 · 1.3%
On-time departures
77.1%

STS → SEA

Scheduled flights
783
Flights operated
774
Cancelled
9 · 1.1%
On-time departures
79.5%

SEA → STS and STS → SEA counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Alaska Airlines AS 1,010 66.0% 79.1% 14
SkyWest Airlines OO 521 34.0% 76.7% 5

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 13, 2024 → Jul 31, 2026

Lowest average delay11:00–12:009.9min · 273 recorded · 271 measured
Recorded flights1,531SEA–STS

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 · No observations · 0 recorded · 0 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 165 recorded · 164 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 28 recorded · 28 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 76 recorded · 76 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 51 recorded · 51 measured · Source: the US BTS 11:00 · 74.2% · 273 recorded · 271 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 90 recorded · 90 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 49 recorded · 49 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 173 recorded · 171 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 66 recorded · 65 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 45 recorded · 45 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 111 recorded · 110 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 110 recorded · 110 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 106 recorded · 104 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 148 recorded · 145 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 40 recorded · 33 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.

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 · No observations · 0 recorded · 0 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 165 recorded · 164 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 28 recorded · 28 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 76 recorded · 76 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 51 recorded · 51 measured · Source: the US BTS 11:00 · 9.9 min · 273 recorded · 271 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 90 recorded · 90 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 49 recorded · 49 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 173 recorded · 171 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 66 recorded · 65 measured · Source: the US BTS 16:00 · Fewer than 200 measured departures · 45 recorded · 45 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 111 recorded · 110 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 110 recorded · 110 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 106 recorded · 104 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 148 recorded · 145 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 40 recorded · 33 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 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 07:00 · 165 · 165 recorded · 164 measured · Source: the US BTS 08:00 · 28 · 28 recorded · 28 measured · Source: the US BTS 09:00 · 76 · 76 recorded · 76 measured · Source: the US BTS 10:00 · 51 · 51 recorded · 51 measured · Source: the US BTS 11:00 · 273 · 273 recorded · 271 measured · Source: the US BTS 12:00 · 90 · 90 recorded · 90 measured · Source: the US BTS 13:00 · 49 · 49 recorded · 49 measured · Source: the US BTS 14:00 · 173 · 173 recorded · 171 measured · Source: the US BTS 15:00 · 66 · 66 recorded · 65 measured · Source: the US BTS 16:00 · 45 · 45 recorded · 45 measured · Source: the US BTS 17:00 · 111 · 111 recorded · 110 measured · Source: the US BTS 18:00 · 110 · 110 recorded · 110 measured · Source: the US BTS 19:00 · 106 · 106 recorded · 104 measured · Source: the US BTS 20:00 · 148 · 148 recorded · 145 measured · Source: the US BTS 21:00 · 40 · 40 recorded · 33 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———
05:00No observations———
06:00No observations———
07:00Fewer than 200 measured departures—164165
08:00Fewer than 200 measured departures—2828
09:00Fewer than 200 measured departures—7676
10:00Fewer than 200 measured departures—5151
11:0074.2%9.9 min271273
12:00Fewer than 200 measured departures—9090
13:00Fewer than 200 measured departures—4949
14:00Fewer than 200 measured departures—171173
15:00Fewer than 200 measured departures—6566
16:00Fewer than 200 measured departures—4545
17:00Fewer than 200 measured departures—110111
18:00Fewer than 200 measured departures—110110
19:00Fewer than 200 measured departures—104106
20:00Fewer than 200 measured departures—145148
21:00Fewer than 200 measured departures—3340
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 · 75.7% · 241 recorded · 239 measured · Source: the US BTS Tuesday · Fewer than 200 measured departures · 197 recorded · 196 measured · Source: the US BTS Wednesday · Fewer than 200 measured departures · 196 recorded · 196 measured · Source: the US BTS Thursday · 76.7% · 237 recorded · 236 measured · Source: the US BTS Friday · 77.8% · 240 recorded · 230 measured · Source: the US BTS Saturday · Fewer than 200 measured departures · 179 recorded · 178 measured · Source: the US BTS Sunday · 76.0% · 241 recorded · 237 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 · 11.0 min · 241 recorded · 239 measured · Source: the US BTS Tuesday · Fewer than 200 measured departures · 197 recorded · 196 measured · Source: the US BTS Wednesday · Fewer than 200 measured departures · 196 recorded · 196 measured · Source: the US BTS Thursday · 8.3 min · 237 recorded · 236 measured · Source: the US BTS Friday · 9.0 min · 240 recorded · 230 measured · Source: the US BTS Saturday · Fewer than 200 measured departures · 179 recorded · 178 measured · Source: the US BTS Sunday · 16.2 min · 241 recorded · 237 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 · 241 · 241 recorded · 239 measured · Source: the US BTS Tuesday · 197 · 197 recorded · 196 measured · Source: the US BTS Wednesday · 196 · 196 recorded · 196 measured · Source: the US BTS Thursday · 237 · 237 recorded · 236 measured · Source: the US BTS Friday · 240 · 240 recorded · 230 measured · Source: the US BTS Saturday · 179 · 179 recorded · 178 measured · Source: the US BTS Sunday · 241 · 241 recorded · 237 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday75.7%11.0 min239241
TuesdayFewer than 200 measured departures—196197
WednesdayFewer than 200 measured departures—196196
Thursday76.7%8.3 min236237
Friday77.8%9.0 min230240
SaturdayFewer than 200 measured departures—178179
Sunday76.0%16.2 min237241

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 · Fewer than 200 measured departures · 80 recorded · 74 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 61 recorded · 58 measured · Source: the US BTS Mar · Fewer than 200 measured departures · 65 recorded · 64 measured · Source: the US BTS Apr · Fewer than 200 measured departures · 86 recorded · 86 measured · Source: the US BTS May · Fewer than 200 measured departures · 174 recorded · 174 measured · Source: the US BTS Jun · 67.5% · 204 recorded · 203 measured · Source: the US BTS Jul · 72.8% · 244 recorded · 243 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 124 recorded · 122 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 120 recorded · 120 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 101 recorded · 101 measured · Source: the US BTS Nov · Fewer than 200 measured departures · 148 recorded · 147 measured · Source: the US BTS Dec · Fewer than 200 measured departures · 124 recorded · 120 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 · Fewer than 200 measured departures · 80 recorded · 74 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 61 recorded · 58 measured · Source: the US BTS Mar · Fewer than 200 measured departures · 65 recorded · 64 measured · Source: the US BTS Apr · Fewer than 200 measured departures · 86 recorded · 86 measured · Source: the US BTS May · Fewer than 200 measured departures · 174 recorded · 174 measured · Source: the US BTS Jun · 18.3 min · 204 recorded · 203 measured · Source: the US BTS Jul · 11.7 min · 244 recorded · 243 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 124 recorded · 122 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 120 recorded · 120 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 101 recorded · 101 measured · Source: the US BTS Nov · Fewer than 200 measured departures · 148 recorded · 147 measured · Source: the US BTS Dec · Fewer than 200 measured departures · 124 recorded · 120 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
Jan · 80 · 80 recorded · 74 measured · Source: the US BTS Feb · 61 · 61 recorded · 58 measured · Source: the US BTS Mar · 65 · 65 recorded · 64 measured · Source: the US BTS Apr · 86 · 86 recorded · 86 measured · Source: the US BTS May · 174 · 174 recorded · 174 measured · Source: the US BTS Jun · 204 · 204 recorded · 203 measured · Source: the US BTS Jul · 244 · 244 recorded · 243 measured · Source: the US BTS Aug · 124 · 124 recorded · 122 measured · Source: the US BTS Sep · 120 · 120 recorded · 120 measured · Source: the US BTS Oct · 101 · 101 recorded · 101 measured · Source: the US BTS Nov · 148 · 148 recorded · 147 measured · Source: the US BTS Dec · 124 · 124 recorded · 120 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
JanFewer than 200 measured departures—7480
FebFewer than 200 measured departures—5861
MarFewer than 200 measured departures—6465
AprFewer than 200 measured departures—8686
MayFewer than 200 measured departures—174174
Jun67.5%18.3 min203204
Jul72.8%11.7 min243244
AugFewer than 200 measured departures—122124
SepFewer than 200 measured departures—120120
OctFewer than 200 measured departures—101101
NovFewer than 200 measured departures—147148
DecFewer than 200 measured departures—120124

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 77.3% 1,184
  • Delayed >15 min 21.4% 328
  • Cancelled 1.2% 19
  • 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

12
12 of 12
Flight numbersBy direction DeparturesOn time
AS1321 SEA → STS 404 77.6%
AS1322 STS → SEA 247 79.2%
AS1321 STS → SEA 158 68.0%
OO3411 SEA → STS 69 60.9%
OO3412 STS → SEA 68 85.3%
AS1141 SEA → STS 44 88.6%
AS1142 STS → SEA 44 97.7%
OO3044 STS → SEA 42 83.3%
OO3410 SEA → STS 42 69.1%
AS1481 STS → SEA 35 85.7%
AS1480 SEA → STS 34 97.1%
OO3037 STS → SEA 34 81.8%

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 122 +0.8% 0 77.0%
June 2026 84 −29.4% 0 78.6%
May 2026 62 −44.6% 0 98.4%
April 2026 60 +130.8% 0 90.0%
March 2026 44 +120.0% 1 95.5%
February 2026 28 −6.7% 1 82.1%
January 2026 34 −15.0% 6 70.6%
December 2025 56 −12.5% 4 58.9%
November 2025 77 +10.0% 1 85.7%
October 2025 67 +97.1% 0 91.0%
September 2025 120 0 80.0%
August 2025 122 2 77.0%
July 2025 121 1 68.6%
June 2025 119 1 59.7%
May 2025 112 0 79.5%
April 2025 26 0 92.3%
March 2025 20 0 65.0%
February 2025 30 2 66.7%
January 2025 40 0 65.0%
December 2024 64 0 90.6%
November 2024 70 0 78.6%
October 2024 34 0 91.2%

How to read this chart

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